Originally Posted by Jon@Texas-Speed

I'd like to see some dyno results comparing cathedral port heads to ls7 stock & ported heads. We made 750+ flywheel horsepower in a street 454 LSX with PRC LS7 ported heads. That's more than 50rwhp over any other 427+ cube engine on our dyno. LS7 heads cost $2800 from us & about 200 for ls7 rockers. How does that compare to the cathedral heads?

PRC LS7 heads with titanium valves $2900
LS7 Rockers $199
LS7 Intake & Fuel Rail $500
TOTAL $3600
Vs.

Aftermarket Cathedral Heads $2600???
Roller Rockers Arms $450
Fast LSx Intake $800
TOTAL $3850

So basically you can build a LS7 setup with 400cfm heads for less money than it takes to buy a cathedral port head & all the stuff to make it work.

We're currently building a large runner tweaked valve angle cathedral head for production, but there's just little chance a cathedral port supports the power the LS7 head can produce.

The only way I see someone pushing a cathedral head over a LS7 style 400cfm head is because they only offer cathdral heads!!