Re: 543 440 Combo's
[Re: Dragula]
#2781441
06/04/20 05:07 PM
06/04/20 05:07 PM
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Joined: Jun 2004
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birdtracker
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super stock
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this should be really interesting. I would like to hear your bore and stroke thoughts. I did have a 4.375 stroke crank in a RB iron block with only a little grinding. Birdtracker
Last edited by birdtracker; 06/04/20 05:46 PM.
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Re: 543 440 Combo's
[Re: Dragula]
#2781579
06/05/20 01:14 AM
06/05/20 01:14 AM
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Joined: Aug 2003
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Cab_Burge
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Which stock block, year and type, B, RB hemi I wouldn't waste my time or money on using a girdle in any stock RB or B block I do use aluminum main caps and ARP main suds on the 400 blocks I build if they sonic test good Buy a good block and have fun making a lot of power
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 543 440 Combo's
[Re: Dragula]
#2781653
06/05/20 11:18 AM
06/05/20 11:18 AM
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440Jim
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Depends on power level. Turning 2000 rpm on the street should not be a problem. Making over 800 hp, I would want a better block.
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Re: 543 440 Combo's
[Re: 440Jim]
#2781774
06/05/20 02:51 PM
06/05/20 02:51 PM
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Joined: Jan 2003
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fast68plymouth
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I’m not sure which combo the “543” is.
4.375 x 4.500 is 541.2 4.380 x 4.500 is 542.4 4.500 x 4.250 is 540.7 4.440 x 4.375 is 541.9
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 543 440 Combo's
[Re: fast68plymouth]
#2781898
06/05/20 09:10 PM
06/05/20 09:10 PM
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Joined: Jan 2003
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ZIPPY
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I’m not sure which combo the “543” is.
4.375 x 4.500 is 541.2 4.380 x 4.500 is 542.4 4.500 x 4.250 is 540.7 4.440 x 4.375 is 541.9 You know Dwayne, I never could figure out what a 472 crate hemi was either. 4.25 x 4.150 = 470.9 Did "471" sound too much like a Ford product? Not sure what the logic was there. We will never know. But I do remember the part number was P5249666. As in "mark of the beast" if you believe such things LOL
Rich H.
Esse Quam Videri
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Re: 543 440 Combo's
[Re: ZIPPY]
#2781925
06/05/20 10:07 PM
06/05/20 10:07 PM
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Dragula
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Just curious who has built one in a stock block, and how hard did you lean on it.....We have a ton of the 512 builds running around here. Fastest one was mine at 9.70 at 138.5mph on pump gas which my little 400/512 has eclipsed to a 9.60...We even have one of the 526 builds running real strong in my buddies car, so the obvious question is how would the 543 fair? http://store.440source.com/Stroker-Kits/products/3/440 >> 543. (4.500" stroke/7.100" rod)
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Re: 543 440 Combo's
[Re: Dragula]
#2781995
06/06/20 08:27 AM
06/06/20 08:27 AM
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Joined: Jan 2003
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ZIPPY
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Well, here is another bump... I'd like to know just for info.
Rich H.
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Re: 543 440 Combo's
[Re: mopar dave]
#2782144
06/06/20 02:31 PM
06/06/20 02:31 PM
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Joined: Jan 2003
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Al_Alguire
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FWIW the 512" low deck in my Valiant went 9.0's at 150 NA. SO you can certainly can make some steam this way. Will it live a long happy life, mine sure didn't. It went 100ish passes before the block gave out. Yes it had aluminum caps. Im pretty sure the 900ish HP from an NA combo in a stock block was just to much for the ole gal. I don't really know the power as it was never on the dyno but went 150 at 3470lbs so 900ish. When I did it they were between iron blocks and didn't have the $$$ for aluminum. I learned my lesson and now choose better blocks, but they have their limitations too I suppose.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: 543 440 Combo's
[Re: Al_Alguire]
#2782145
06/06/20 02:34 PM
06/06/20 02:34 PM
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Al_Alguire
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My 470" tall deck went 9.69 at 139 in a 3100lb Duster with iron heads. It don't take a ton of power to run that in a typical A body racecar, 650ish will do it and I think they can live long happy lives at that level. Provided that the cylinders have some thickness or they have a tall fill.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: 543 440 Combo's
[Re: Dragula]
#2782278
06/06/20 10:31 PM
06/06/20 10:31 PM
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Joined: Jan 2003
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gregsdart
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I like it for a high torque low rpm build. I raced a 4.5 stroke 4.350 bore motor many years ago. Very mild build that made enough power to go 10.20s at 129 mph in a 3400 lb duster. I ran 4.10 gears and 33 inch tall slicks. Since the block has about a 650 hp fuse on it, plan accordingly. The best part is it can make decent power at VERY low rpm allowing a long valvetrain and block life if rpm is kept low.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 543 440 Combo's
[Re: mopar dave]
#2782395
06/07/20 01:35 PM
06/07/20 01:35 PM
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Al_Alguire
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That is a bunch of hp Al. What compression, cam and heads does it take to get 900hp? I say 900ish because it was never on a dyno, just a garage build but I know the car went 150 at 3470. It was 15.5-1, CFE ported B1 heads. Cam I am not sure I have the info any longer but I recall was low .800" lift for sure(common shaft T&D's, would have been a split lift deal), duration sure was high 280ish/290 ish and on a 114-117 lobe center. I am sure I have the build notes just not sure where as we are getting ready to move. It would be typical for other B1 stuff I have done over the years, this was a very nice set of heads done by CFE. The heads ended up on another combo and made 1025 in a 572. FWIW our 446 we ran in the dragster when my kid was a newbie was probably 650plus. Went 8.19 best here in Vegas at 1875lbs. Was a 12-1 compression deal with decent set of Indy -1's and a smallish roller on E85. Would have been in the 7's at sea level.
Last edited by Al_Alguire; 06/07/20 01:39 PM.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: 543 440 Combo's
[Re: fast68plymouth]
#2782963
06/08/20 06:09 PM
06/08/20 06:09 PM
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Joined: Jun 2004
Posts: 741 Carson City, NV
440sourcedotcom
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super stock
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I’m not sure which combo the “543” is.
4.375 x 4.500 is 541.2 4.380 x 4.500 is 542.4 4.500 x 4.250 is 540.7 4.440 x 4.375 is 541.9 Our 543 kit is a 4.500 stroke x 4.380" bore, which equals 542.43 cubic inches. We offer pistons for that kit in .060" over, so we usually rate the cubic inches at the largest available bore size. And we did round up by .57 hundredths of a cubic inch.
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Re: 543 440 Combo's
[Re: 440sourcedotcom]
#2782968
06/08/20 06:18 PM
06/08/20 06:18 PM
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Joined: Jul 2008
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dIc dOc Deity !
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I’m not sure which combo the “543” is.
4.375 x 4.500 is 541.2 4.380 x 4.500 is 542.4 4.500 x 4.250 is 540.7 4.440 x 4.375 is 541.9 Our 543 kit is a 4.500 stroke x 4.380" bore, which equals 542.43 cubic inches. We offer pistons for that kit in .060" over, so we usually rate the cubic inches at the largest available bore size. And we did round up by .57 hundredths of a cubic inch. Which block do you recommend? Any consideration on the industrial 413,block ? What’s the minimum wall thickness? Do you offer an assembled short block ?
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Re: 543 440 Combo's
[Re: Cab_Burge]
#2783407
06/09/20 09:02 PM
06/09/20 09:02 PM
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dIc dOc Deity !
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I've sonic tested 4 stock bore(4.180) 413 truck and industrial block, none of them would go safely above 4.250 bore size in my opinion I like to have at least .160 wall thickness on both thrust surfaces after boring Never sonic checked that 413 block myself but I saw an operation ONE BESTER than that ! When I was west side down State Michigan there was a guy I knew who had a BUSTED UP block ...... Who pulled up sections of that block.... I saw areas in the cylinder walls - ON THAT BLOCK - that were near .250 !
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Re: 543 440 Combo's
[Re: dIc dOc Deity !]
#2783441
06/09/20 10:22 PM
06/09/20 10:22 PM
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Joined: Aug 2003
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Cab_Burge
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4.170+.250=4.420, correct 4.420-.160=4.260, hence me choosing to bore them to standard 426W and 383 bore sizes for pistons and ring choices
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 543 440 Combo's
[Re: dIc dOc Deity !]
#2785796
06/15/20 05:51 PM
06/15/20 05:51 PM
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Joined: Jun 2004
Posts: 741 Carson City, NV
440sourcedotcom
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I’m not sure which combo the “543” is.
4.375 x 4.500 is 541.2 4.380 x 4.500 is 542.4 4.500 x 4.250 is 540.7 4.440 x 4.375 is 541.9 Our 543 kit is a 4.500 stroke x 4.380" bore, which equals 542.43 cubic inches. We offer pistons for that kit in .060" over, so we usually rate the cubic inches at the largest available bore size. And we did round up by .57 hundredths of a cubic inch. Which block do you recommend? Any consideration on the industrial 413,block ? What’s the minimum wall thickness? Do you offer an assembled short block ? Most all blocks are the same and work great. If you haven't read it, check out our article on engine blocks here: http://www.440source.com/blockinfo.htmWe've found the 413 industrial blocks to have very thick cylinder walls (over .400") so they usually support boring out to a 440 size. But you should always sonic check the specific block you are using, and make sure it has enough thickness. The factory "spec" for cylinder wall thickness is .250". We usually don't like to see less than .180" or so.
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Re: 543 440 Combo's
[Re: Dragula]
#2807469
08/10/20 09:37 PM
08/10/20 09:37 PM
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Joined: Jan 2003
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gregsdart
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The one i posted about earlier in this thread was actually a 426 wedge block bored .100 to 4.350 and a stock rod journal size of 2.375 using 6pak rods and a 4.500 stroke. At 535 cubes with 906 heads it took a .750 lift 286 @ .050 roller to make power above 5700 rpm. I see little point in pushing a 4.5 stroke stock block above5500 to 6000 due to strength issues. Same with power. Stay at about 650 hp and enjoy the torque.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 543 440 Combo's
[Re: Dragula]
#2807511
08/10/20 11:16 PM
08/10/20 11:16 PM
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Joined: Jan 2003
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gregsdart
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5.90 in the 1/8th is about 9.23 in the 1/4 and at 3000 race weight will take about 750 hp. So i would definately find a good 400 block and go with a 512 with ported large port heads. The easeist route is 14.5 + compression, mechanicl fuel injection, alcohol and a rollercam similar to an Isky RR735. Plan your valvetrain carefully. I needed more spring than isky called for with that cam. You might hit the number at 3000 lbs with that recipe and bowl porting only, but it will be close. I went 9.34 at 143 mph in Minnesota (1800 da?) With bowl ported 440-1 heads, 13/1, 499 cubes, 283/290/110 roller cam of .760 lift. Alky injected, shifting 6800.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 543 440 Combo's
[Re: gregsdart]
#2807597
08/11/20 09:56 AM
08/11/20 09:56 AM
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Joined: Jan 2003
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fast68plymouth
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To go 9.20’s at 3000lbs will require a little over 700hp, uncorrected, as it sits on the starting line. So, you’d be shooting for 770-800 STP hp on the dyno.
Probably not the best plan for a stock block.
Making the power isn’t that hard. Getting the stock block to live at that power level is the challenge.
I wonder how many have built stock 440 block combos that make 750+ hp(especially long stroke combos)........ and race them regularly(as in..... a typical weekly bracket program).
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 543 440 Combo's
[Re: racerx]
#2807750
08/11/20 03:53 PM
08/11/20 03:53 PM
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gregsdart
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5.90 in the 1/8th is about 9.23 in the 1/4 and at 3000 race weight will take about 750 hp. So i would definately find a good 400 block and go with a 512 with ported large port heads. The easeist route is 14.5 + compression, mechanicl fuel injection, alcohol and a rollercam similar to an Isky RR735. Plan your valvetrain carefully. I needed more spring than isky called for with that cam. You might hit the number at 3000 lbs with that recipe and bowl porting only, but it will be close. I went 9.34 at 143 mph in Minnesota (1800 da?) With bowl ported 440-1 heads, 13/1, 499 cubes, 283/290/110 roller cam of .760 lift. Alky injected, shifting 6800. It has been done. @ what weight ? Race wieght was 3000 lbs. That 499 lived a good long life and was sold and hit with nitrous for a couple seasons.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 543 440 Combo's
[Re: Dragula]
#2807810
08/11/20 06:39 PM
08/11/20 06:39 PM
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Joined: Aug 2003
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Cab_Burge
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I just don't know about a 4.5 stroke in a stock block...
I wouldn't learn either AKA don't stress the main webbing in a stock block, even with a girdle
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 543 440 Combo's
[Re: gregsdart]
#2808175
08/12/20 05:40 PM
08/12/20 05:40 PM
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racerx
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5.90 in the 1/8th is about 9.23 in the 1/4 and at 3000 race weight will take about 750 hp. So i would definately find a good 400 block and go with a 512 with ported large port heads. The easeist route is 14.5 + compression, mechanicl fuel injection, alcohol and a rollercam similar to an Isky RR735. Plan your valvetrain carefully. I needed more spring than isky called for with that cam. You might hit the number at 3000 lbs with that recipe and bowl porting only, but it will be close. I went 9.34 at 143 mph in Minnesota (1800 da?) With bowl ported 440-1 heads, 13/1, 499 cubes, 283/290/110 roller cam of .760 lift. Alky injected, shifting 6800. It has been done. @ what weight ? Race wieght was 3000 lbs. That 499 lived a good long life and was sold and hit with nitrous for a couple seasons. Thanks ….sounds real close to my combo but I have a little more cubes with more race weight and less cam and the i'v been is 600.2.
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Re: 543 440 Combo's
[Re: 8urvette]
#2854086
12/01/20 11:24 PM
12/01/20 11:24 PM
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Joined: May 2004
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Dragula
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My parts arrived, and I would like to get back to this thread and see what HP you guys are at with one of these......I have Indy big easy 325 heads, so I am curious how far this will go. What kind of cam specs should I be shooting for? My little .680 lift 280 duration is staying with my 512/400 so I am going to need a new cam. I like the 280 duration, maybe more lift?
I will be in the 5's this year, one way or another...
Last edited by Dragula; 12/01/20 11:29 PM.
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Re: 543 440 Combo's
[Re: Dragula]
#2854216
12/02/20 10:46 AM
12/02/20 10:46 AM
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HardcoreB
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What do you guys think of this combo in a stock block with a girdle? Since you asked and based on your stated goal...I think Dwayne (and some others) answered your question but it went unrecognized? The extra stroke will help add compression but you can do the same with a piston. If you are set on changing the combination of parts...I'd put the longest rod you can on a crank 3.75 to 4" and SPIN it for power make the bobweight under 2000 gms on a 2.1 pin. Put BETTER work and parts in your top end and it'll make the same power at 451" as it will at 541" but the bobweight and longer rod will help it live.
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Re: 543 440 Combo's
[Re: Dragula]
#2854674
12/03/20 08:18 AM
12/03/20 08:18 AM
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Joined: Dec 2013
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GTS340
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Been 6.02 so far at 3000lbs...with my little 400/512....It just seems like it does not pull as hard down track as my previous 440/512.....Which got me thinking about the bigger strokers they offer...The 526 and then the 543....Seems like my current combo with 20 more Hp would make it...
I just don't know about a 4.5 stroke in a stock block... Are you implying that the RB platform makes more power than a B platform in the same type of build? 1.6 intake rockers, have someone who knows what they're doing revise the Indy CNC ports/valve job, and porting the intake manifold would have got you there. As far as longevity, I agree with HardcoreB's recommendation.
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Re: 543 440 Combo's
[Re: GTS340]
#2854679
12/03/20 08:28 AM
12/03/20 08:28 AM
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Dragula
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Yes is my quick answer.
We went 6.13 with a pump gas 512/440 without a lot of effort, and our race gas 400/512 runs about the same ET after lots of effort.....We suspect its the longer rods that allows the 440/512 to pull harder on top, but that's just a guess. It also took us a while to get the little 400/512 to mph the same. And you have to remember, its got smaller journals and weighs less, so where is the improvement?
I did learn, the 400/512 intake seems a bit more restrictive than the 440 based intake. I gained a bunch of ET when I ported the intake. So, it might be a plenum thing. We have debated this around the shop for a while as the small journal and light weight B combo should be faster than the RB, but it has not turned out that way for us. Same carb, same heads, same cam, same headers, same car.
So it begs the question, what happens if we go to a high compression 440 based unit of the next size up?
Last edited by Dragula; 12/03/20 08:44 AM.
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Re: 543 440 Combo's
[Re: Dragula]
#2854814
12/03/20 02:11 PM
12/03/20 02:11 PM
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Joined: Jul 2004
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Thumperdart
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Build a 470, problem solved homey......
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: 543 440 Combo's
[Re: Dragula]
#2854887
12/03/20 06:27 PM
12/03/20 06:27 PM
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I did learn, the 400/512 intake seems a bit more restrictive than the 440 based intake. I gained a bunch of ET when I ported the intake. So, it might be a plenum thing. We have debated this around the shop for a while as the small journal and light weight B combo should be faster than the RB, but it has not turned out that way for us. Same carb, same heads, same cam, same headers, same car.
Dragula .....what cam, compression were use with the 400/512 combo i thought i read somewhere that you were useing -1's for heads ?
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Re: 543 440 Combo's
[Re: Dragula]
#2933097
06/14/21 09:49 AM
06/14/21 09:49 AM
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mshred
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My parts arrived, and I would like to get back to this thread and see what HP you guys are at with one of these......I have Indy big easy 325 heads, so I am curious how far this will go. What kind of cam specs should I be shooting for? My little .680 lift 280 duration is staying with my 512/400 so I am going to need a new cam. I like the 280 duration, maybe more lift?
I will be in the 5's this year, one way or another... I am going to resurrect this thread from the dead as I am interested in how this build is going for you in the stock block, or if its running yet. What kind of clearancing was required? What external oil system did you end up with? Been considering this combo for my scamp with the Trickflow 270s and either a Solid FT or roller cam to get me into the 9's on pumpgas at 3400lbs.
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Re: 543 440 Combo's
[Re: mshred]
#2933203
06/14/21 01:29 PM
06/14/21 01:29 PM
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Dragula
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Running 6.0's at 113.7mph, trying to go into the 5's....I have about 13 passes on it, 11 all in a Friday Saturday stint where I ran two classes and made the semis in both and the starter quit in the lanes. Still tuning and replacing brand NEW parts. Plugs were dead rich....All new carb, convertor, motor....
The list of stuff that needing fixing/replacing was almost endless this year, but I am down to carb tuning, and another brand new high torque starter....And probably slicks very soon.
Then I learned I need my chassis re-certed to go 5's as its out, and probably a full face helmet & gloves...Not sure have to check.
Last edited by Dragula; 06/14/21 02:28 PM.
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Re: 543 440 Combo's
[Re: Dragula]
#2933250
06/14/21 03:47 PM
06/14/21 03:47 PM
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Toronto
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Running 6.0's at 113.7mph, trying to go into the 5's....I have about 13 passes on it, 11 all in a Friday Saturday stint where I ran two classes and made the semis in both and the starter quit in the lanes. Still tuning and replacing brand NEW parts. Plugs were dead rich....All new carb, convertor, motor....
The list of stuff that needing fixing/replacing was almost endless this year, but I am down to carb tuning, and another brand new high torque starter....And probably slicks very soon.
Then I learned I need my chassis re-certed to go 5's as its out, and probably a full face helmet & gloves...Not sure have to check. Yikes, sounds like some expensive bad luck, but also sounds like its movin and you'll be able to get after it. Maybe I missed it, but do you have the final engine combo posted somewhere?
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Re: 543 440 Combo's
[Re: mshred]
#2933362
06/14/21 09:26 PM
06/14/21 09:26 PM
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Joined: May 2004
Posts: 12,379 Taxes & Virus's R-US, NY
Dragula
OP
I Live Here
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OP
I Live Here
Joined: May 2004
Posts: 12,379
Taxes & Virus's R-US, NY
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For the few runs I have on it, it runs very well. This year was wet and cold to start with, and I got zero testing in. So 6.07 at 113.9mph off the trailer isn't too bad leaving at 2400rpm and shifting at 6400...
As I lean it out, it will get meaner....It was super lean at idle, and then goes too rich at the hit....I have a wide band in the car this year....So I fattened up the idle, and leaned out the main jets and HSB, plus I have a 3-circuit shop carb to try out and my old 1250 2 circuit to see if its too big or not. So this Friday, I am going to to TNT if I can get the day off....Its a long shot due to a big IHRA event this weekend.
The list of busted stuff this year has been a real PITA......Broke the tongue jack on the trailer (my fault), broke the rear door on the trailer (not my fault), wiring & brakes on the trailer quite (not my fault), carb was off a bit, brand new starter fried.....stupid fuel pump has been an on going nightmare....GoPro died, and my AFR gauge gave me fits....
Last edited by Dragula; 06/15/21 11:46 AM.
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Re: 543 440 Combo's
[Re: Dragula]
#2933545
06/15/21 12:25 PM
06/15/21 12:25 PM
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Joined: Jan 2003
Posts: 13,319 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,319
Marion, South Carolina [><]
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That's a lot smaller cam than I expected in that combo.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: 543 440 Combo's
[Re: an8sec70cuda]
#2933550
06/15/21 12:52 PM
06/15/21 12:52 PM
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Joined: Jan 2003
Posts: 14,479 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,479
So. Burlington, Vt.
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I went through a 541(4.375 x 4.500) that was built from a Mega Block several years ago. Flat tops(12:1-ish), -1 heads, roller cam with 1.5 rockers. I ported the heads and installed 2.25” intakes.
Made a little over 800hp with a 440-2/adapter and an 1150 on it.
With a ported Indy TR and 2 x 1050’s it made 848hp.
With the 4.375” bore It could be built out of a stock 440 block, but at that power level I’m not sure how wise that would be.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 543 440 Combo's
[Re: Dragula]
#2933579
06/15/21 02:22 PM
06/15/21 02:22 PM
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Joined: Apr 2009
Posts: 3,412 Toronto
mshred
master
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master
Joined: Apr 2009
Posts: 3,412
Toronto
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For the few runs I have on it, it runs very well. This year was wet and cold to start with, and I got zero testing in. So 6.07 at 113.9mph off the trailer isn't too bad leaving at 2400rpm and shifting at 6400...
As I lean it out, it will get meaner....It was super lean at idle, and then goes too rich at the hit....I have a wide band in the car this year....So I fattened up the idle, and leaned out the main jets and HSB, plus I have a 3-circuit shop carb to try out and my old 1250 2 circuit to see if its too big or not. So this Friday, I am going to to TNT if I can get the day off....Its a long shot due to a big IHRA event this weekend.
The list of busted stuff this year has been a real PITA......Broke the tongue jack on the trailer (my fault), broke the rear door on the trailer (not my fault), wiring & brakes on the trailer quite (not my fault), carb was off a bit, brand new starter fried.....stupid fuel pump has been an on going nightmare....GoPro died, and my AFR gauge gave me fits....
Impressive for sure! And only shifting at 6400....what gas are you running with the 14.5:1 CR?
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