Thinking about Vortec heads...

[pontiacgp]

This is the cam I am using vortec heads and 1.5 roller rocker and valve springs with titanium keeps off the ZZ4 heads. It's the same cam they use in the 604 crate. I like how this combination works

Chevrolet Performance 10185071

Hydraulic Roller Camshaft

• Small Block Chevy

• 350 5.7L ZZ3/ZZ4 HO

• Lift: .474'' Int. / .501'' Exh.

• Duration: 208° Int / 221° Exh. @ .050'' Lift

• 112° Lobe Centerline

 

[Yav8]

you posted at 6,500 rpm it still pulling so please explain how your set up is still pulling at 6,500 while by the chart you have reached top torque and hp well before that rpm. And if it still pulling at 6,500 when does your power start dropping off? On all our 602 crates it was obvious the power dropped after 5,800 rpm. Most tracks in the US have the 602 chipped for 5,800. We had a built engine that could rev 8,000 all day long but the heads had alot more than valve springs to maintain that rpm. There was about $8,000 in head and valve train work on that engine

The 602 crate motor has a very small cam. From the GM book, #24502476 Lift 435 I 460 E with 212 I and 222 E at 50. This is a flat tappet so its a very small cam even on the street. That crate motor is a simple vortec headed truck motor with some racing parts and a small cam. Its the vortec heads that make the power.

 

[pontiacgp]

Your right, on paper they don't look like much but you get more than the $3,400 they cost and it sounds alot healthier than it should

 

[Kwik_Cutty88]

you posted at 6,500 rpm it still pulling so please explain how your set up is still pulling at 6,500 while by the chart you have reached top torque and hp well before that rpm. And if it still pulling at 6,500 when does your power start dropping off? On all our 602 crates it was obvious the power dropped after 5,800 rpm. Most tracks in the US have the 602 chipped for 5,800. We had a built engine that could rev 8,000 all day long but the heads had alot more than valve springs to maintain that rpm. There was about $8,000 in head and valve train work on that engine

I won't argue with you about it. I built the motor, I drive the car. It's been to 7000 not by choice) and never fell on its face. I drive the car quite frequently, I know how it behaves. I'm not gonna look at a graph and say "oh it's gonna fall off now." When in the car it's still making power. Thanks for the information though.

 

[Kwik_Cutty88]

OP I am sorry for the thread hijack here.