I took a block to get a final hone on it today, guy asked why I wanted to build a 318 and there was no way and he had never seen one bored so big.

Looked confused over the 4 bolt mains.....

I asked him if he ever seen this on a 318 block and pointed to the X.

Then he told me I needed more piston to cylinder wall clearence because of the altitude....I still dont get it......

So if its the right 318, its all good. This 318 will be a 422 incher when all is said and done.

Ive a hughes 426 kit in a 360 block...kit was dead on perfect. I dont understand the piston choice, but they know more then me.