"no one" wrote in message ...
I called summit, they didn't stock anything called vortec...

Vortec is a word GM used to describe a swirling of the intake gasses in the
cylinder and combustion chamber - what specifically are you talking about?

"Dave" wrote in message
snip

Just in case you are still interested, these heads are on the Summit
website under:

Engines & components/Cylinder heads and accessories/ GM Performance
Vortec Heads

$259 each with valve and springs.


I'll agree with the others it will take a LOT more power to increase
speed 10mph. A buddy of mine wanted his stock 454 powered 24ft Baja to
go faster. Basically he had to double the power to increase top speed
by 12mph.