Quote:
Originally Posted by Sam Capizzi Jr
The 318 2bbl motor has two major issues... Intake/carburetor and Valve clearance. Right now I'm using a 240 duration cam at .050 and I have .025 clearance on the intake and .040 on the exhaust. If they would allow a 4 eyebrow 318 replacement piston, the combo would be good at 185 hp and would pull high rpm with more cam... Btw the 69 motor has .031 less clearance.
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Well Sam, if you can stand another FWIW(don't ya just hate us keyboard racers?). I don't know how bad your intake is but I do know that some of the early 70s 318s had a single plane intake that doesn't look bad and the carb is bigger than the carb I'm allowed to use on my 307. Have you ever had the heads on a flowbench? What kind of cranking pressure (cylinder pressure) do you have? I'm asking because I think that your cam is a little too big. Shorten up that duration (and tighten lobesep?) and you've got valve clearence. What have you got for header dia? length?