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#1
12-05-2010, 01:33 PM
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Engine going to the Dyno Tuesday any Guesses on what kind of pwr it makes
Started in August with the rebuild and it is finally broke in and on the dyno stand for a few pulls. Just looking for some guesses on HP and TQ. The engine specs are as follows:
73 400 block stroked to 461 ARP Studs for main caps Forged h beam rods and forged srp pistons cast crank 4.25 stroke and balanced Comp ratio is 9.3 to 1 heads are 4x 7h and have 2.11 and 1.77 valves X-over filled and flow 241 on int and 228 exh Cam is tomahawk TC-02-HF [email protected] 236/244 [email protected] 510/505 LC 112 Johnson lifters comp cams 1.52 roller rockers, upgraded rocker studs & polylocks custom length pusrods intake is a stock 73 Exhaust on dyno will be headers w/ 1 5/8 tubes timing is currently set at 32 degrees and plugs look perfect. Will use a 650 holley carb to start and have others to try if needed Engine builder said with the detail and percision that he put into the assembly engine would have no problem surviving at 6000 rpm. I told him it would most likley never see over 5500 but its good to know. what do you think it will put out? |
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#2
12-05-2010, 01:38 PM
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I have a feeling the 650 holley may be to small.
can't wait to hear about the numbers |
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#3
12-05-2010, 01:48 PM
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I'll say it "could" pull in the upper 400's HP range. I wish the heads flowed a little more and the carb will be too small for max HP. However, the smaller carb will make better torque numbers. With the 650 carb and 241 cfm heads I'll guess...
462 HP @5400 and 500 ftlbs TQ @3400 rpm.
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Good luck to the new owner of the Ventura II! Sold the car after 13+ years. Look for it on the Hot Rod Power Tour in the future as it's currently being re-configured as a Pro-Touring ride! 
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#4
12-05-2010, 01:56 PM
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the 650 carb is just the carb we used to break it in so we figured we would start with it. He has several other carbs up to about 1100 we can try so fuel should not be an issue.
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#5
12-05-2010, 02:04 PM
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Around 440hp/500 ft/lbs.I think you will find it will want more timing like in the 36 to 38 range.
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#6
12-05-2010, 02:06 PM
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Depends on the dyno- I'd guess low 400s as I would bet track mph in the car would show. Generous dyno 450-470. Neither guess with the 650 on it, especially fitted to a stock intake! 5500-5700 peak HP.
I'd think about a single pattern cam or trying more ratio rockers on the intake if you can with that head flow ratio. E/I 94%! At least a little more lift on the intake.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune [email protected] 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs 1964 Corvette Coupe 327 4 speed |
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#7
12-05-2010, 02:40 PM
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400 HP 510 TQ
__________________
“Nothing in the world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan Press On! has solved and always will solve the problems of the human race.” ― Calvin Coolidge |
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#8
12-05-2010, 07:51 PM
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428 hp and 515 tq right at 5500
__________________
" Is wearing a helmet illegal" Mike Kerr 1-29-09 |
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#9
12-05-2010, 08:56 PM
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Are we talking flywheel hp or to the rear wheels?
Robert |
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#10
12-05-2010, 09:07 PM
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450/530tqe
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#11
12-05-2010, 09:47 PM
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engine dyno, so it will be at the flywheel. Thanks for the estimates I will post the actual dyno sheets. My goal was over 400 hp and close to 500 ft lbs torque. should be interesting. I also plan on video taping it to post.
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#12
12-05-2010, 10:32 PM
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460 hp@ 5200 520 torque
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Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,[email protected]@117.74  2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, [email protected] [email protected] M/T 275/60 ET SS Drag Radial 2024(Pontiac 505) 1.25 60 ft, [email protected], [email protected].... 275/60 Radial Pro's |
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#13
12-06-2010, 12:17 PM
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415-430hp by 5100 and 480-490tq before the pull even starts, goodluck with that 650! 850 minimum! better bring two of everything to the dyno!
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D.S.R.E. Your NW Pontiac Street/Strip Engine Builder, Specializing in Cylinder Head,Intake Manifold,and Exhaust Manifold Porting services and Building the Most Efficient stock rebuilds to Hi HP Pump Gas and Race Combinations for Pontiac,Buicks,Olds,FE Fords,385 Series and HP Gen 3 and 4 LS engines! 2006 silvy Z71 4X4,383 LS 600+hp NA Shared Toy-66 Lemans 470cid by me 537hp 580tq-manifolds, 570hp 590tq-2"headers,custom cam,rpm intake, mild e-heads, Looks stock ;-} |
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#14
12-06-2010, 01:51 PM
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It will be interesting to see the hp difference when your swapping carbs.
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#15
12-06-2010, 05:25 PM
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I think you will meet your goals, regardless, of the numbers.
Is that a 73 EGR intake??? IF it is, I'll be real curious how this goes. I hear the EGR intakes are junk, never seen any dyno #'s to tell me this, for a fact. Every dyno is different, and you can adjust the dyno somewhat, to make the numbers different... 400 HP and 500 ft/lb honest numbers would be awesome. I'm looking forward, also to seeing how one on Ace's cams does... Looks like a real good combo, that govenor carb might work better that we all think.....
__________________
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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#16
12-07-2010, 07:41 AM
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It should make 440-450hp, and at least 500ft lbs torque across most of the useable rpm range.
A few years ago KRE accidentally ported a set of the 455 4X heads and put them on a 455 using the Crower 60919 cam. They didn't realize until after the fact that they had one of their helpers port the 4X heads with the HUGE chambers. They went ahead and dyno'd it anyhow, and it made close to 440hp and 500ft lbs torque. I just happened to be up there dynoing my own 455 right after that happened. The numbers were pretty impressive considering the dismally low compression ratio.....Cliff
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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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#17
12-07-2010, 09:12 AM
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450-460 hp 500-515 tq.
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#18
12-07-2010, 03:34 PM
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435-440 HP 530 TQ
Cliff sent ya an email |
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