[Jason Porter]

I think the engine configuration you've chosen so far is going to explode into tiny, oily, metallic pieces. I totally agree with Dave on this one. If you are going with 100mm pistons, I strongly suggest you find corresponding cylinders. The heat from the automatically increased compression and friction surface will crack those bored-out, cast iron cylinders in less than 20,000 miles.

Assuming this engine is for a 914, go with stroke for power, and low-end torque, something 914's didn't get a lot of.



Second, 96's are the largest dependable piston size you can go with, unless you use Nickies. One word - Bucks!!!

Cam choices? You have to take into account that cam lift and duration directly affect the entire valve train. More lift and duration means more spring tension needed to close what you opened, and more spring tension means sturdier valves, because stock valve keeper grooves will tear clean off the valve stem with too much spring tension.

Basically, this all means head work. One word - Bucks!!!

The question you should be asking yourself first, is what kind of power you want to make, how long do you want it to last, and what are you willing to spend.

Then base your configuration on the answer to those questions.