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#1
07-03-2023, 07:39 PM
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035 Over 400 with Kaufman 74cc dport
Can I get away with running this on the street with pump gas 91 octane?
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#2
07-03-2023, 08:41 PM
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Shouldn’t be a problem.
__________________
1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#3
07-03-2023, 08:43 PM
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My .060 over 400 with KRE heads runs just fine on 91 octane
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#4
07-04-2023, 12:57 AM
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I use thecalculator onSD Performance site.
With zero deck height 7 cc valve reliefs total .039 head gasket. I get 10.3:1. With aluminum heads that should be a plenty safe deal. Of course all the details make a diffetence...
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... 
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#5
07-04-2023, 06:52 AM
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Actually don’t assume that there 74 CCs, confirm that yourself!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#6
07-04-2023, 09:29 AM
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Please tell us you're gonna run a snotty solid flat tappet with deep rear gears and a muncie .... buzz it to the moon!
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#7
07-04-2023, 10:45 AM
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Should be no problem at all running that combination on 91 octane pump gas, if it is cammed correctly
__________________
1978 Trans Am Pump Gas 461 Stroker |
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#8
07-04-2023, 11:43 AM
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Quote:
30 over 400 with 74 cc 290 KRE d ports. 10.14 cr. H-O 744 HL cam. Slight detonation on 87, none on 91. 30* total mechanical advance.
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Frank M. 75 Firebird 68 Firebird 400 RAIII 66 Chevy II 461 Pontiac in AZ |
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#9
07-04-2023, 12:15 PM
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Butler Hydraulic Roller BP8023SP
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#10
07-04-2023, 12:41 PM
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Quote:
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#11
07-04-2023, 02:07 PM
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Quote:
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1978 Trans Am Pump Gas 461 Stroker |
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#12
07-04-2023, 05:57 PM
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Thanks guys! It's going to the machine shop!!
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#13
07-04-2023, 09:57 PM
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Quote:
__________________
Frank M. 75 Firebird 68 Firebird 400 RAIII 66 Chevy II 461 Pontiac in AZ |
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#14
07-05-2023, 07:58 AM
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You should be able to pee in the tank and be fine with that cam.
You also need vacuum advance, at least if you want the best power, efficiency and throttle response for "normal" driving. With that combo about 10-12 degrees would be plenty....IMHO....
__________________
If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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