300 six head question
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Joined: Dec 2010
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300 six head question
hello, i have a 300 sitting in my shed all torn down. im getting ready to bore it and everything. but i was reading that you can shave the head down a little bit. i am currently majoring in the machinist field at school so i was wondering how much i could shave off the head. well what the maximum is that i can take off. i was thinking .015 thousandths. but im not sure if thats the maximum. the bottom of the head is rusty so thats why i want to shave it down and so i can up my compression.
Lead Driver
Joined: Mar 2008
Posts: 7,177
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From: Near Los Angeles
Of course the exact way to do it is to measure the chambers and calculate the c.r. using one of the online sites. You can read up on the process. If you got to Clifford Performance and read about the build he markets, IIRC he says take .060" off the head. But with todays gas prices, no one wants to have to use premium.
However, I took .020 off the block, and the same off the head, and run the cheapest gas possible w/o problem of pinging ... until the outside temp hits about 110*, and then it pings like crazy, and I have to dump in a can of octane booster. You want to shoot for 9.0 to under 9.5:1 c.r.
However, I took .020 off the block, and the same off the head, and run the cheapest gas possible w/o problem of pinging ... until the outside temp hits about 110*, and then it pings like crazy, and I have to dump in a can of octane booster. You want to shoot for 9.0 to under 9.5:1 c.r.
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