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Gen III Hemi and B/RB Question #2015078
02/19/16 12:15 AM
02/19/16 12:15 AM
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ahy Offline OP
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I am a great fan of the Gen III hemi. I think I am on my 4'th in a DD. Superb engine.

I am also a fan of the B/RB and have one in a '70 Challenger. Stock block and Ed heads.

Comparing the two engines with stock blocks and "stock'ish" heads the Gen III block seems like it can take more power and the heads flow more air. Still, the B/RB seems to run faster (just a casual but interested observer). Why is that? Does the gen III just need more time and development? Is it gearing? Shape of the power curve? Some other factor?

What do the gurus think? What is needed for the gen III to shine?

Re: Gen III Hemi and B/RB Question [Re: ahy] #2015099
02/19/16 12:36 AM
02/19/16 12:36 AM
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Nebraska
72Swinger Offline
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All I can say is I went from a "good" running BB to a Gen III. The BB was a pump gas ,hyd cam, flat top, ported stock heads, RPM intake and FAST EZ TB EFI. At 3400 lbs the fastest it EVER went in the 1/4 was 112mph with Sunoco 112. Gen III has flat tops,ported stock heads, ported stock intake, hyd cam and EFI. At 3700 lbs it went 122 MPH first time out with 28 less cubic inches and pump 91.


Mopar to the bone!!!
Re: Gen III Hemi and B/RB Question [Re: 72Swinger] #2015153
02/19/16 01:20 AM
02/19/16 01:20 AM
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Charleston
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sixpackgut Offline
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496 12-1 indy ez heads 630 270 roller 3" exhaust 9.71@140

426 11-1 eagle heads. 600 250 hyd. 3" exhaust. 9.88@134

Same converter and gear


Gen 3 power 6.22@110, 9.85@135
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Re: Gen III Hemi and B/RB Question [Re: sixpackgut] #2016598
02/21/16 02:22 PM
02/21/16 02:22 PM
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Taxes & Virus's R-US, NY
Dragula Offline
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Originally Posted By sixpackgut
496 12-1 indy ez heads 630 270 roller 3" exhaust 9.71@140

426 11-1 eagle heads. 600 250 hyd. 3" exhaust. 9.88@134

Same converter and gear


I think there is a good advantage in weight reduction going to the G3 over an RB, no?

Only draw back seems to be the cost. Do you know the approx cost for what each mill cost you?

The Wedge I am guessing is in the $7500 range, but the G3 with headers and ignition has to be closer to +$10k I was thinking....Love you car and combo by the way...Seems like it does double duty really well. Which combo did you prefer driving wise and did you have the GV unit with the RB?


Last edited by Dragula; 02/21/16 02:23 PM.

'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk
Re: Gen III Hemi and B/RB Question [Re: Dragula] #2018058
02/23/16 02:27 PM
02/23/16 02:27 PM
Joined: Jun 2003
Posts: 9,225
Charleston
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sixpackgut Offline
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Originally Posted By Dragula
Originally Posted By sixpackgut
496 12-1 indy ez heads 630 270 roller 3" exhaust 9.71@140

426 11-1 eagle heads. 600 250 hyd. 3" exhaust. 9.88@134

Same converter and gear


I think there is a good advantage in weight reduction going to the G3 over an RB, no?

Only draw back seems to be the cost. Do you know the approx cost for what each mill cost you?

The Wedge I am guessing is in the $7500 range, but the G3 with headers and ignition has to be closer to +$10k I was thinking....Love you car and combo by the way...Seems like it does double duty really well. Which combo did you prefer driving wise and did you have the GV unit with the RB?



short blocks cost what short blocks cost basically for any combo or brand.

my eagle heads were $422 and I ported them.

My apache heads not on car yet cost 1200

My EZ heads cost around 2k and I ported hem to MW port

My BB had $700 harlands. My gen 3 stock rockers

headers same cost really. Actually I bought my fenderwells for the BB for $700 and got $600 for them when I sold them because the price went up so much. paid $740 for the TTI's

ignition, same, when you add Dist, Coil and 6al to Hemi 6 controller

I could go on and on but it all costs the same when you figure it out except I think the hemi block is better, the stock heads are better and if you want to go boost it would be easier

I just sold the GV. I want to stop being so slow at drag week. My car is going on a diet and will be faster next year.

I doubt I lost all that much weight going from the BB to the hemi. 100lbs maybe

I think if I was a little more aggressive with the hemi it would be just as fast as my BB was. little more comp, a little more cam, etc

Last edited by sixpackgut; 02/23/16 02:28 PM.

Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram

performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
Re: Gen III Hemi and B/RB Question [Re: ahy] #2018091
02/23/16 03:25 PM
02/23/16 03:25 PM
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Renton Washington
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Triple Threat Offline
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My Hemi is going to end up in the $12K range, I've been keeping track. That's intake to oil pan, water pump to flex plate using good stuff and including headers and ignition. It could be done cheaper, but you'd be making sacrifices IMO.

My experience is there isn't much difference in cost as Ray pointed out. Short blocks are pretty comparable price wise, SB, BB , G3. Headers are the same. Heads and rocker gear depends on what you want.

No matter how you cut it, when starting from scratch, building an engine isn't cheap.


-Dustin
67 Dart, 9 second, 392" G3 Hemi
68 Barracuda 340 F/SA
Re: Gen III Hemi and B/RB Question [Re: ahy] #2018100
02/23/16 03:53 PM
02/23/16 03:53 PM
Joined: Feb 2011
Posts: 4,302
Nebraska
72Swinger Offline
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Don't forget the $100+ for GOOD plugs wires that Gen III's don't need. But that might be offset by the 16 spark plugs....


Mopar to the bone!!!
Re: Gen III Hemi and B/RB Question [Re: sixpackgut] #2018414
02/23/16 11:04 PM
02/23/16 11:04 PM
Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
Dragula Offline
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Posts: 12,383
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Originally Posted By sixpackgut
Originally Posted By Dragula
Originally Posted By sixpackgut
496 12-1 indy ez heads 630 270 roller 3" exhaust 9.71@140

426 11-1 eagle heads. 600 250 hyd. 3" exhaust. 9.88@134

Same converter and gear


I think there is a good advantage in weight reduction going to the G3 over an RB, no?

Only draw back seems to be the cost. Do you know the approx cost for what each mill cost you?

The Wedge I am guessing is in the $7500 range, but the G3 with headers and ignition has to be closer to +$10k I was thinking....Love you car and combo by the way...Seems like it does double duty really well. Which combo did you prefer driving wise and did you have the GV unit with the RB?



short blocks cost what short blocks cost basically for any combo or brand.

my eagle heads were $422 and I ported them.

My apache heads not on car yet cost 1200

My EZ heads cost around 2k and I ported hem to MW port

My BB had $700 harlands. My gen 3 stock rockers

headers same cost really. Actually I bought my fenderwells for the BB for $700 and got $600 for them when I sold them because the price went up so much. paid $740 for the TTI's

ignition, same, when you add Dist, Coil and 6al to Hemi 6 controller

I could go on and on but it all costs the same when you figure it out except I think the hemi block is better, the stock heads are better and if you want to go boost it would be easier

I just sold the GV. I want to stop being so slow at drag week. My car is going on a diet and will be faster next year.

I doubt I lost all that much weight going from the BB to the hemi. 100lbs maybe

I think if I was a little more aggressive with the hemi it would be just as fast as my BB was. little more comp, a little more cam, etc


The Hemi's will tolerate a lot of compression on pump junk. I would have probably stayed with the GV unit and thrown more gear at the engine. How much did it weigh and what gears were you running?

If I built a 6.1 stroker, it would be 12:1 right out of the gate, and the ability to tune it with gasket thickness ....The rest, I would do like yours. I like it a lot. I can't think of a better NA combo than yours in an A body.

My 512 should be in the 9.60's this year on pump gas, so we have learned how to make one of those run....But I am not sure we could hook that on a small drag radial. It does not like like a lot of rpm..But a 1.32 60ft really gets the thing moving in a hurry.

Now my 605 is more built for mid 9's in street trim....I am debating going to a 315 radial in the rear over the M&T street cheaters I normally run...My biggest gripe...M&T does not make a matching radial front runner in 28" diameter..


'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk
Re: Gen III Hemi and B/RB Question [Re: ahy] #2018531
02/24/16 01:20 AM
02/24/16 01:20 AM
Joined: Jun 2003
Posts: 9,225
Charleston
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sixpackgut Offline
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Charleston
One of the things is my BB would have went 9.50s or better. The very next pass after the 9.71, i opened the cutouts. Waited for ever after an oil down. It bogged real bad, 1.6x 60ft and ran the exact same 9.71.

I had 4.10s in it with the GV. It felt better in 1st gear but its just to much weight to compete at DW where guys are outspending me 3 to 1. The 727 with 3.55s was faster although it felt like a dump truck.

I am now going 904 with a low gear set and 3.73 gears. I think with some tuning and the weight loss I may see low 9.7s and still be able to run 70 mph and get 14+ mpg

The gv and 4.10s vs 727 and 3.55s was about the same on the highway

Right before DW, i added over 100lbs and the rotating weight of the GV, plus the fact i entered in the sealed hood competition caused my poor performance. Im ashamed how bad i got my azz kicked by the aluminum block, trick flow head, liberty trans fox body


Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram

performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
Re: Gen III Hemi and B/RB Question [Re: ahy] #2018659
02/24/16 11:05 AM
02/24/16 11:05 AM
Joined: Jan 2003
Posts: 9,980
Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline
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"Im ashamed how bad i got my azz kicked by the aluminum block, trick flow head, liberty trans fox body"
Ashamed of what? Getting beaten by someone that didn't have stock off the shelf parts as a base? Kinda like comparing an SS motor to a Comp Eliminator motor, isn't it?
Sounds to me like you are learning, and having a good time at it to boot. up

Last edited by gregsdart; 02/24/16 11:07 AM.

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: Gen III Hemi and B/RB Question [Re: gregsdart] #2018779
02/24/16 03:03 PM
02/24/16 03:03 PM
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Charleston
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sixpackgut Offline
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Originally Posted By gregsdart
"Im ashamed how bad i got my azz kicked by the aluminum block, trick flow head, liberty trans fox body"
Ashamed of what? Getting beaten by someone that didn't have stock off the shelf parts as a base? Kinda like comparing an SS motor to a Comp Eliminator motor, isn't it?
Sounds to me like you are learning, and having a good time at it to boot. up


I should have had been making a better showing the past 2 times.

"PPPPP"- one of the Motown Missile quotes

poor preparation pizz poor performance


Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram

performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs






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