318 with a new 4” crankshaft.

PROSTOCKTOM said

Since you're planning on changing out every component on the 318 you might as well change the block to a 340 or 360 block so you can buy some quality off the shelf pistons.

Using KB hyper pistons at 11 to 1, if they even make one for a 318 bore with a 4" stroke crank is just asking for trouble in my opinion.

Also are you wanting to make power or just sound like you have power? Using a Thumper camshaft is a very poor idea if you want real power production.

Tom

Click to expand...

I've never seen any KB hyper pistons for a 318 bore/4" stroke. if you get an '85-up 318 or 318 magnum block you can run stock roller lifters on a hydraulic roller cam.....doing a 4" stroker, other than the "number" (392), there's no advantage to doing that over starting with an '89-up 360 or 360 magnum block for the stock roller cam....the 4" (nominal) bore rotating assembly options are less expensive than the 3.91" (nominal) bore options to offset the cost difference in the block if there is any.