Re: 499 vs 512 low deck
[Re: Ohio Joe]
#2050862
04/10/16 07:34 AM
04/10/16 07:34 AM
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Joined: May 2004
Posts: 3,210 robin hood country
deaks
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master
Joined: May 2004
Posts: 3,210
robin hood country
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This has gone 5.95 with a 470 on E85 At what weight though ?
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200# best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft best 60ft 1.36
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Re: 499 vs 512 low deck
[Re: Ohio Joe]
#2051008
04/10/16 01:33 PM
04/10/16 01:33 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
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State of confusion
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2950, it weighs 100 lbs less than our 66 dart. Nice........what heads........
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: 499 vs 512 low deck
[Re: Ohio Joe]
#2051029
04/10/16 02:03 PM
04/10/16 02:03 PM
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Joined: May 2005
Posts: 1,030 ohio
67mprfan
super stock
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super stock
Joined: May 2005
Posts: 1,030
ohio
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This has gone 5.95 with a 470 on E85 Can you tell us more about your combo
71 demon stock stroke 440/indy ez-1 running 10.10 @ 132.14 mph in the 1/4 and 6.36 @ 107.46 mph in the 1/8 not in the same weekend but It did it then I sold it. 67 Belvedere that worked it's way in the 10's
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Re: 499 vs 512 low deck
[Re: Thumperdart]
#2051338
04/10/16 09:50 PM
04/10/16 09:50 PM
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Joined: Jun 2013
Posts: 51 1.5 miles west of Jacksonburg ...
Ohio Joe
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member
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1.5 miles west of Jacksonburg ...
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It has Indy SR'S . We call the car Spare Parts because the motor belongs to a friend who wasn't racing at the time and the tranny and vert belong to another friend . We rushed putting it together for Norwalk. To say the least we were very suprise what it ran.
66 Dart GT " Rat Racer"
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Re: 499 vs 512 low deck
[Re: Eric]
#2051832
04/11/16 01:53 PM
04/11/16 01:53 PM
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Joined: May 2004
Posts: 3,210 robin hood country
deaks
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master
Joined: May 2004
Posts: 3,210
robin hood country
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Who ported the heads, cam size, comp please ? I'm just about to fit a 470 in mine. Mick
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200# best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft best 60ft 1.36
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Re: 499 vs 512 low deck
[Re: Eric]
#2051899
04/11/16 03:21 PM
04/11/16 03:21 PM
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Joined: Jan 2003
Posts: 13,402 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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Marion, South Carolina [><]
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I'd go w/ the 4.25" stroke.
Seems there was a discussion a while back by one of the big name builders...like Kaase or maybe Reher-Morrison, I cant remember who exactly. They basically said the rod-stroke ratio didn't really matter when it came to making power.
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: 499 vs 512 low deck
[Re: an8sec70cuda]
#2051912
04/11/16 03:32 PM
04/11/16 03:32 PM
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Joined: Jan 2003
Posts: 9,892 Weddington, N.C.
Streetwize
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Weddington, N.C.
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512" Built all the B/RB combinations from 431" all the way up to 517", bigger is more and .200" of rod length won't mean diddly, especially on a low/moderate RPM torque motor. Again, piston selection from all the major Piston Mfg's is all over that 451/512 1.32" Compression height slug.
If 6.535" seems short for a 4.25" stroke in a 9.98" deck, remember that there are 10X as many big block 496" Chevies with only 6.135" and 6.385" rods running around.
Last edited by Streetwize; 04/11/16 03:34 PM.
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Re: 499 vs 512 low deck
[Re: Eric]
#2052136
04/11/16 08:47 PM
04/11/16 08:47 PM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
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Aurora, Colorado
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I went with the 499 stroked 400 block. I figured it would be easier on the engine block at high RPM (lighter weight, lower acceleration rates and loading when switching direction, less side wall thrust loading?) Down side with the short piston might be piston rock/ring seal on the intake stroke? You can get a 4.15" crank with the 2.20" rod journal, that will give a better selection of rods/rod lengths. Currently using the Hughes CNC ported MW Victor heads. I did not cc the Hughes heads, but compression with 75cc should be around 12.4:1 with zero decked flat tops. I used the old 440 source stroker kit with I-Beam rods and ARP2000 bolts, and the BCR aluminum main caps with girdle. Not too many runs on it, because of the issues with the old Victor heads. Just got it running with the new CNC heads and E-85 last year, so we'll see how this year goes? I think the 4.25" stroke low deck is a good choice for most street/strip cars that are not going to run 7000+ RPM. I do have the 4.25" crank in the 440 block in the convertible
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Re: 499 vs 512 low deck
[Re: Streetwize]
#2052191
04/11/16 09:53 PM
04/11/16 09:53 PM
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Joined: Jan 2003
Posts: 10,020 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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I Live Here
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512" Built all the B/RB combinations from 431" all the way up to 517", bigger is more and .200" of rod length won't mean diddly, especially on a low/moderate RPM torque motor. Again, piston selection from all the major Piston Mfg's is all over that 451/512 1.32" Compression height slug.
If 6.535" seems short for a 4.25" stroke in a 9.98" deck, remember that there are 10X as many big block 496" Chevies with only 6.135" and 6.385" rods running around. Yep!
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 499 vs 512 low deck
[Re: Ohio Joe]
#2055125
04/15/16 07:56 PM
04/15/16 07:56 PM
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Joined: Jan 2004
Posts: 581 Hamiltucky
RBDuster
mopar
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mopar
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Posts: 581
Hamiltucky
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Mick,hate to say but I don't know a whole lot about the motor.i just own the body. I "think" Duwane Porter did the heads and spec ed the cam. Sorry, but that's about all I know about the motor. combo is 3.90 stroke, 4.375 bore, 6.700 rod, flat top pistons with a total compression of 11.4 to 1, Cam is a comp 661 lift and 274 duration at .0050. Heads are Indy SR's that were ported by Dwayne Porter. Indy intake with a Horsepower Innovations 850 E85 carb.
Last edited by RBDuster; 04/15/16 07:58 PM.
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Re: 499 vs 512 low deck
[Re: fbs63]
#2055193
04/15/16 09:46 PM
04/15/16 09:46 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
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State of confusion
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One thing about the LD 512. The 1.54 rod ratio adds more thrust on the cylinder wall. I would make sure you have the block sonic tested and find a good one. No need to be worried about a short comp height. OEM engines now are all close to 1" comp height and go 200,000 miles. In your light car with the heads you have I would do a 470. Quicker rpms and your heads will support 470 cubes well. THIS................ Been streetin/racing mine for almost 15 years w/the same 413 off-set stroke crank and Chevy Eagle rods and I just run junky ol E-brock home ported RPM heads and a solid roller..........
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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