Okay, here's a question that is not to far off topic. I am getting ready to warm up a 1970, 250 six. When I switch to the 1.6 exhaust valves do I have to put in bigger seats, or can the originals be machined to take the larger valve.
According a dyno-simulator computer program the bigger exhaust valves add 6 hp.
If you can get 5 hp at the carb, 5 at the exhaust, 6 at the valves, 8 at the cam, et, pretty soon you've gained 50 hp, and you still have a very drivable/depedable engine. 50 hp is a 30% gain on an average 250, and that is a BIG bump.
Thanks,
Bob
