ryan1964
Well-Known Member
Ok so I'm build a 318 stock bore flat top pistons new bottom end either a 454 lift cam or a 480 lift summit grind 4 speed is putting 360 J heads on it going to help it or hurt it
318 build
- Thread starter ryan1964
- Start date
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Flat top as in stock or (near) zero deck aftermarket ? Hopefully the second one.
What rear gears ?
Got links to the cams or just copy paste their specs here.
Mopar44134
Well-Known Member
Switching to 360 typically drops compression a point or more. Older 318s were higher in compression. Cleaning up the ports on the 318 would be ideal rather than giving up compression.
You can mill the 360 heads by like .030-.040" I forget exactly and keep at least stock cr.
It’s not that simple. What you have to do is cc the combustion chamber of the head your using and cc the bore with the pistons your going to use at top dead center and figure your compression ratio that is your static compression ratio. Then with that AND your cam specs go to wallace racing calculators and figure out your dynamic compression ratio.
7:1=super doggy
8:1=still doggy
9:1=you will end up wanting more
10:1=now your getting somewhere
11:1=you better have an awesome engine
Builder and a spot on tune cause
Your coming into detonation
territory with pump gas.
Now to answer your question what year 318 and what heads does it have now?
7:1=super doggy
8:1=still doggy
9:1=you will end up wanting more
10:1=now your getting somewhere
11:1=you better have an awesome engine
Builder and a spot on tune cause
Your coming into detonation
territory with pump gas.
Now to answer your question what year 318 and what heads does it have now?
ryan1964
Well-Known Member
1970 and pretty close to zero deck
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