Shaving HEad Power Gain
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Junior User
Joined: Aug 2004
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From: Way up in the mountains
Shaving HEad Power Gain
I have a '77 F250 and it is equipped with a 351-M. Can anyone give me an estimate of the power gain I will achieve if I shave the heads down 15 thousandths? Thanx.
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From: chicago burbs
do you realize that adds up to over an inch? if you meant .072 and .035, you'd just be getting into detonation, knock and ping territtory. i'd go with a cam, timing set and headers for some usable power and improved driveability. you'll be surprised how far the stock 2bbl will go.
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From: iowa
Originally Posted by grclark351
do you realize that adds up to over an inch? if you meant .072 and .035, you'd just be getting into detonation, knock and ping territtory. i'd go with a cam, timing set and headers for some usable power and improved driveability. you'll be surprised how far the stock 2bbl will go.
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Joined: Dec 2003
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From: iowa
that is about right, and where I fugured, with a total of .075x.2=1.5, and add that to 8.5:1 + 10:1 comp ratio.
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Junior User
Joined: Aug 2004
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From: Way up in the mountains
Thanks for all the help guys. It has been well appreciated. But i think my best bet is to junk the old motor and invest in a crate engine.
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Posting Legend
Joined: Sep 2001
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I always figured about .1 compression points for every 0.010" off open chamber heads. You need to run the math for the actual compression ratio on any engine. There are a number of good compression ratio calculators out there.
A cam and headers etc are a better way to make power.
A cam and headers etc are a better way to make power.
Elder User
Joined: Nov 2003
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From: Okla.
Yes anything less than 93 it will ping and knock. But when it fires on you know it. Yes cam, is good . Yes headers is good . Yes the geardrive is good , but comprtion is best. I had to put 351W pushrods in it. Lets see 250.00 virces 25.00 for a shave job. That means the 6 kids don't get to eat for the week. I did the math, this works for me and has for 4 years. In that time I have burnt a set of 33 SX's, that is an inch of rubber. 
