2.4 270hp 2.7 350hp ?

[Two Oh]

I read a post by Matt Holcomb that the above mentioned engines are built by a fellow by the name of John Gregory.

I am very curious as to what is done to these engines that make this kind of horsepower.

I assume most of the work to get this kind of HP is some extensive head work. But what kind of improvements to the heads?

If so, start at the top ( fuel intake ) and work your way down to the crank.

BTW, I've read that a 1/4 round bull nose to the face of the valves is better than a 3 angle cut? Any truth to this?
And in the VW bug magazines they have 200hp 1800cc engines? Whats up with this?

Thanks, You guys are great.

[ChrisBennet]

Originally posted by Two Oh:
I
BTW, I've read that a 1/4 round bull nose to the face of the valves is better than a 3 angle cut? Any truth to this?

Probably not, see:
http://www.se-r.net/faq/articles/head.tech.html
"Or you can try valve seating surfaces-maybe someday you can tell me why sharp edges are better here than rounded ones. The worst valve I ever tested was one I made the mistaken belief my eye could judge how air would behave between the valve and seat. I ground a valve head with a radius instead of a flat where it seated, along with a similar-shaped grinding stone for the seat. Testing this idea required tons of work, yet my streamlined valve and seat combination was worse at all lifts than the typical series of abrupt, sharp-edged flats."