460 Compression ratio and power - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
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post #1 of 2 (permalink) Old 05-18-07, 10:59 AM Thread Starter
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460 Compression ratio and power


Couple questions for the people that have built a few 460's. I have built a 547 ci storker for my 69 mustang fastback and would like to know what kind of hp I can expect to get. I started with a 1986 truck engine bored it .40 over with kb 402 pistons, these show to give 9.4 cr with 97cc heads! I used the stock heads off the 86 with stock valve size. I cleaned up all the ports and removed the smog bumps from exhaust port. I milled all the towers and installed screw in studs and added roller tipped rockers! I do all my own head work so no money wasted, just time! I plan to add better heads later that is why I used the stock heads. I have aftermarket 6.7" I beam rods with 4.5" stroke. Engine was balanced. I am going to use a Edelbrok performer intake toped with a 850cfm demon carb. Cam is by Comp Cams 34-341-4 Magnum solid with these specs

Camshaft Specification Table
Part Number 34-341-4
Engine 1968-1994 Ford
Grind Number FF 282S-10


Intake Exhaust
Valve Adjustment 0.022 0.022
Gross Valve Lift 0.57 0.57
Duration At 0.015 Tappet Lift 282 282


Valve Timing At 0.015
Open Close
Intake 35 67
Exhaust 75 27


These Specs Are For The Cam Installed At 106 Intake CL
Intake Exhaust
Duration At 0.05 236 236
Lobe Lift 0.33 0.33
Lobe Separation 110

I know the heads are the cork in the engine right now, how much HP and torque do you think and how much do you think I am giving up with these heads? Is the 9.4 cr about right on these engines for pump gas on a street car?

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post #2 of 2 (permalink) Old 05-22-07, 01:32 AM
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cool Re: 460 Compression ratio and power

These big engines need a lot of air to breathe, and increased compression ratio helps this part of the equation a lot.

I'm going to take a wild guess and estimate 500HPas-is, but I think that your motor has more potential with a bigger cam, bigger carb, and well ported iron heads...all of which could add 80HP or more.


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