Newbie 318 piston question
That is an interesting question, worth looking into.
Like the high compression height of those, would have to be used with the open chambered heads. With those valve reliefs looks like cam selection won't be a problem as far as interference is concerned.
The harder to find factory mopar pistons have a compression height of 1.78 ch sitting .040 ths down in the hole which is pretty good for factory pistons.
Aftermarket stock replacements can be 1.755 ch.
These KB399 have a 1.81 ch sitting .010 above deck.
Was lucky enough just by chance to pick up a fresh set of 318 open chamber heads at a swap meet a few years back. Did not realize until looking at them lately here that someone had installed 360 valves in those 318 heads.
So yes, this could make an interesting combination too with the KB399 pistons.
Think stock 318 open chamber heads, a mild cam, and the KB399 pistions would wake up a basic 318 engine.
Although the factory 1.78 ch flat top pistons were able to produce 9.2:1 cr @ 230 hp, stock heads, that's with a 2 bbl carb.
Looking like the KB399 pistons with 68 cc open chamber heads are rated at 9.2:1 cr too.
KB399 have the higher compression height of 1.81 ch, but maybe they are loosing some chamber volume with those big valve reliefs. Don't Know ??
Worth looking into . . .
That is an interesting question, worth looking into.
Like the high compression height of those, would have to be used with the open chambered heads. With those valve reliefs looks like cam selection won't be a problem as far as interference is concerned.
The harder to find factory mopar pistons have a compression height of 1.78 ch sitting .040 ths down in the hole which is pretty good for factory pistons.
Aftermarket stock replacements can be 1.755 ch.
These KB399 have a 1.81 ch sitting .010 above deck.
Was lucky enough just by chance to pick up a fresh set of 318 open chamber heads at a swap meet a few years back. Did not realize until looking at them lately here that someone had installed 360 valves in those 318 heads.
So yes, this could make an interesting combination too with the KB399 pistons.
Think stock 318 open chamber heads, a mild cam, and the KB399 pistions would wake up a basic 318 engine.
Although the factory 1.78 ch flat top pistons were able to produce 9.2:1 cr @ 230 hp, stock heads, that's with a 2 bbl carb.
Looking like the KB399 pistons with 68 cc open chamber heads are rated at 9.2:1 cr too.
KB399 have the higher compression height of 1.81 ch, but maybe they are loosing some chamber volume with those big valve reliefs. Don't Know ??
Worth looking into . . .
