NAPA has a limited number of performance parts for the 250. That's where are bought my cam, and 307 pistons. They also have oversize valves, high wind valve springs, oversize valve seats, manifolds, headers, et.
Something that intrigues me as I progress on my own 250 is this: The stock horsepower rating is 155 HP. According to some figures we ran on a desktop dyno you can add 40-50 horses by bumping the compression, bigger exhaust valves, better carb, headers or other free flowing exhaust, performance cam, et. Mostly bolt on and easy internals. Now here's the rub; 50 horses is a 33% increase! That's a difference you can feel! That's what I'm shooting for. I've decided not to go the lump port route this time around. I think I'm getting enough increase that I'll be pretty happy. (Most old worn out high milage 250's are putting less than 100 horses on the ground. Something to think about.)
Boo Radley
