Help me please tryin to beef up 318

krazykuda said
I've had stock 360 heads at 72 cc's...

I have a set of 67 318 heads that are supposed to be 57 cc measuring at 63 cc.... :banghead:


My brother once gave me a 318 short block with 10.5 forged pistons in it. I used the top half of my 68 318 to complete it and throw it in my car for under $400 out of pocket. It would overheat when the temp got above 80° due to the high compression...

I installed a set of 77 360 heads and never had another problem with it. There was enough of a compression drop to get it to run on cheap pump gas, it didn't need premium...

There was enough of a compression drop....
Click to expand...

Your numbers are good. I was equalizing the chambers within .2 cc's of NHRA minimum volume. That is where everyone gets their numbers (NHRA minimum volume) from, but virgin castings fall in what you measured. So milling .040 number gets the largest chamber to NHRA minimum volume, and I'd polish the smaller chambers to match the largest. That .040 cut also works for 318 and 273 chambers to get down to NHRA minimum volume.