I think part of the deal here is that if you think pecentages a few horses may be a big increase with a small engine. I'm sure that a good for barrel and high rise set up on a V8 gets a lot more horses than a good carb/intake set up on a stovebolt. The 16 hp bump I refered to above was on a 235. If you have a 100 hp engine 16 horses is a HUGE bump. I think Clifford has a combination of cam, intake, carb, and headers they claim will give a 25% increase. Okay, if you're working on a 150 horse 250, 25% is 37.5 horses, and that is a long way from what this ebay clown is claiming! grin
Bob