Another 'What Will/Did it Make' Thread
So...the original 400 rebuild for my 70 GTO is finally done and looking to get some perspective from the Pontiac faithful regarding the results. The engine was broken in on a dyno and made a couple runs. Not yet installed in the car.
Here are the basic specs (ask if you want more). Any guesses on the hp/torque?? - Stock YS bored .30 over (ICON/Scat H-beam/forged) - Stock crankshaft - Ultradyne cam (221/230 @ 0.50, 454 lift, 112LSA) - Stock #13 heads (with a little cleanup/3 angle valve job (Ferrea) and 1.52 roller rockers [asked for stamped OE or roller-tip]) - Stock intake - Stock Qjet - @ 9.5:1 - 9.75:1 compression (need to verify exactly) - DUI ignition :3gears: |
385 hp.
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376HP
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360
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Log exhaust manifolds, ram air manifolds, or headers on the dyno? If either of the manifolds, what head pipe did you use?
Dennis |
FWIW...confirmed 9.54:1 compression.
Headers on the dyno. Will have oversized RARE manifolds/downpipe and 2.5" exhaust/Flowmasters when installed. |
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Dennis |
Will give some more time for others to guess before revealing the results.
I will say that there were only minor tweaks in-between 3 runs that produced @ 5 hp /3 ft. lbs trq gain. I think there might be a little more in it with some additional tuning. |
Everyone else so far is thinking along the same lines. I'm going to say around 380 horses and ~ 425 - 450 ft-lbs
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Dennis |
You made a "couple"runs?No results on them?Tom
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Okay...I'll cave.
Last run was 403/482. Previous run was 398/480. We (builder and I) were shooting for 400hp with a solid/durable foundation. Thoughts?? |
Please give the RPMs for these test and the more meaningful average numbers if you have them?
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I only have a low resolution/grainy video on my cell phone right now for the second to last run. Looks like 398.64 @ 5000 and 480.52 @ 3600. The builder is going to give the cam card/dyno sheets to the restoration shop when the engine is picked up. When I get a copy, I'll post them up.
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Wow that’s great for a stocker I was off by 43hp it will loose some when you put the manifolds on it still nice for pump gas.
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Dennis |
3.23s with Auburn Pro limited slip...
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Very nice build, greatly exceeded my expectations. You taking it to the track?
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Fantastic, and congrats! Those are some nice numbers.
I was only off by ~20hp but I greatly underestimated the torque. WTH is wrong with me, it's a PONTIAC after all... LOL. |
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