Originally Posted by Rickracer
My information comes from my machinist, who's done all my work for over 25 years, does a TON of local racer's porting work, even has some national record holders, and owns his own Superflow 600, but I'm always interested in more knowledge and/or different perspectives...
Always listen to your machinist over some nobody
on the internet. If you
don't, find another machinist. He is likely fixing some of the obstructions
in the vortec heads with his valve job. Besides its not cost effective to pay
much for porting vortec heads, if someone is going to get into them that
deep money wise, itís best to start with a better casting IMO. Now if you
do the work your self, itís a different situation. Iíll post some pictures of a
set Iím porting now.
You and I are on the same page with the RPMs. These small journal engines
handle RPM very well and anyone planning to spin one up should invest in
a good set of forged pistons. If you go back and study the combination I
posted, itís really very mild with a power peak well below 7000 RPM, should
make over 400 HP.