318 pistons
Was thinkin that if the 318 needs an overbore why not try to kill two birds with one stone?Get the right oversize piston that will bring comp up as well..Seemed to make sence to me.
So what compression height are you looking for?[/QUOTE]
Well a comp height of 1.755 with a .028 gasket and 70 cc chamber yields somewhere around 8.14:1.Pistons down about .067.Crap comp...
To get 9:1 without changing anything but piston comp height the piston needs to come up .040.So a comp height of 1.795 would work for me.I realize the KB has 1.81 comp height,but thier not really in the budget, at least not for this motor.
Alternately if the crank can be offset ground and stroke increased .020,this will raise the pistons 1/2 that amount,or .010.Comp height needed is now 1.785 for 9:1.This may have to be done anyways depending on the crank.
If the block is decked and cleans up at say .020,now comp height needed is 1.765.I think this is extra $$ and the long way around to get 9:1.Sure the motor will be better for it,but this is a budget engine.
Sorry for being long winded.Just thinking things out.
Realistically,the best most economical approach is just to overbore and get the right piston.
This motor will go back into the cop car and the cop car will be sold to raise funds for my Dart.So the budget for it needs to be strict. Thats why Im looking for the right piston.It can be a cast piston.The motor wont be much more than 320 h.p.Im not averse to using a brand X piston either...
