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I have a 302 that was fully rebuilt with forged flat top pistons,gt-40p heads(not ported),crane 1.7 roller rockers,speed pro cam(224* at .050 dur.,466" lift,110* centerline),edelbrock performer rpm,570cfm holley street avenger carb,pertronix flame thrower hei distributor,svo 9mm wires,1 5/8" shorties,off road h-pipe,pypes violator mufflers,march performance pulleys,electric fan.the engine runs great,idle is nice and lumpy,car pulls real hard,it's backed by a c-4 with a 3000rpm stall and 4.10 posi in a 79 mustang.just wanted some opinions on my estimated horsepower as there is no dyno's near my home and haven't found anybody that wants to try me,tks
 

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Probably 300-330hp at the flywheel depending what octane gas you use and where the timing is set. I have a built 289 in a '66 Stang with a little more cam and much better AFR aluminum heads(much better airflow than the Ford GT-40 heads) and I make about 360hp on 92 octane. You lose about 20% hp when measuring at the rear wheels. So 250hp at the rear wheels is probably more realistic.
 

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I would tend to agree with ragman. You'd see perhaps 20 more hp by stepping up to a 650cmf carb, the 570 is a tad bit small for your set up.
 

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If you're compression is under 10:1( I believe flat tops and 60cc GT40P heads make 9.5:1), you're wasting your money on 94 octane! I have a 340hp FRPP 302, 9.0:1 compression, and run 87 octane, [email protected] 104 mph at 4000ft says I'm not hurting anything.

Other than that, I agree that you are in the 310 to 330hp at the flywheel.
 

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I would guess 250 give or take. But I'm not familiar with the cams and the carburetor numbers. I had two 5.0's an 86 GT and a 93 LX and stock they were about 215.
 
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