Head Porting

[Zr1 Destroyer]

Originally Posted by Locobob

I've been giving the valve guides some serious thought. I've seen pics of some that have been ground right to the floor. I have also had a few knowledgable people opine that this is a bad idea and that I should just shape what's there and not reduce the length of the guides. A shorter guide would possibly be subject to increased wear from friction/heat. On the other hand the engine being an overhead cam design one would think the valve guides would be less critical than a pushrod design in respect to side loading. Hmmm

Hasn't hurt either of my zr1 engines......funny how these knowledgeable people have never tried this in an lt5 before...hmmm!

Anyways....lookin good. Wish the heads came from the factory looking more like yours....a lot of power hidden in there!

Originally Posted by blackjack
in harley heads,we streamline the intake guide,but leave the exhaust guide ''chubby'',otherwise they become very hot at the end if too thin
bj
91/1735

That's an aircooled head vs. a liquid cooled head.......bad comparison!