Estimate HP and Fuel Octane Requirement

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Estimate HP and Fuel Octane Requirement

Post  Athlonia on September 6th 2017, 8:27 am

Hello, I have located a fresh 429 build for sale locally in my area. Wondering if I can get the experts to give me an idea of what the estimate HP of this engine would be and the octane fuel requirements. The intentions of the engine would be to put it in a street driven 73 Mustang.

The attached image and that he believes it is 10:1 compression is all the information I have so far. I believe I can purchase this for about $4k, which seams reasonable.

Any and all input is greatly appreciated. Thank you.




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Re: Estimate HP and Fuel Octane Requirement

Post  zbob on September 6th 2017, 8:36 am

I am not an engine builder but a backyard hack. however I don't see anything there but a stocker with a out of date cam shaft. a good running 5.0 in a fox would clean your clock.
....now that you have the first reply you should get a bunch more responses. bob

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Re: Estimate HP and Fuel Octane Requirement

Post  Wayne Pearce on September 6th 2017, 11:39 am

What I see is essentially a stock motor with unspecified heads, some eye candy, and Chinese rocker arms. I wouldn't spend that much for a basic stock 429.

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Re: Estimate HP and Fuel Octane Requirement

Post  Wayne Pearce on September 6th 2017, 11:50 am

You should check out Wes Litrell's ad in the buy, and sell section! He's selling a .030 over 429 with much better parts for half the money you want to spend on that engine!

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Re: Estimate HP and Fuel Octane Requirement

Post  1EFF100 on September 6th 2017, 9:28 pm

I agree with the other guys--that's too much money for that thing. The .050 duration isn't mentioned on the cam specs but I'd hazard a guess that it's 204/214 which make the cam and intake manifold a mismatch.
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Re: Estimate HP and Fuel Octane Requirement

Post  DILLIGASDAVE on September 7th 2017, 1:57 am

"Hyper (hypereutectic) pistons for nitrous/boost applications"   Evil or Very Mad  Evil or Very Mad  Evil or Very Mad

Meh, maybe if it's a small nitrous shot and having zero detonation, then maybe they might not turn into scattered aluminum shrapnel.
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Re: Estimate HP and Fuel Octane Requirement

Post  stanger68 on September 7th 2017, 1:21 pm

X2- What Wayne said.

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Re: Estimate HP and Fuel Octane Requirement

Post  rmk57 on September 7th 2017, 8:34 pm

1EFF100 wrote:I agree with the other guys--that's too much money for that thing. The .050 duration isn't mentioned on the cam specs but I'd hazard a guess that it's 204/214 which make the cam and intake manifold a mismatch.

282/292 .486/.512.............. fairly close to the specs of an old Cobra-jet cam.

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