Too much head ?
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Teching In
Joined: Mar 2004
Posts: 21
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Too much head ? ....I ended up with a set of LS6 Stage 2 heads from a local racing shop...oversize valves... Comp 921s ...I'll be running them with a Comp 224 581 114 and the usual bolt-ons on a 99 C5 LS1... Would I have been better off performance wise with a 5.3 Stage 2 head? Why? I know I problably need a bigger cam to take advantage of the heads but will they cost hp with the 224?
eh i dunno if they will cost power, but you probably just shouldve saved your money and gotten some 5.3's...the reason you have the possiblity of loosing power especially down low is the port size...if the ports are very large that will give you maybe more cfm flow but will slow down the velocity of the air coming through which is what gives you tq.
lata
Bill
lata
Bill
Luther, calm down. The ZO6 heads will work fine with the Cam. If your really worried about every last HP. Then you could sell the heads and do a stage 2 5.7 or 5.3 . But I'd just get the car going and enjoy this nice MO. weather 
STF Veteran
Joined: Oct 2003
Posts: 3,486
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From: Greensboro, North Carolina
The good thing about those heads is that if you get a bigger cam you will be able to utilize the heads better. You can grow into those heads. You would probably outgrow the 5.3 heads. I don't think that those heads will hurt you too much.
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Originally Posted by 1QWIKZ
too much head???lol. i wish i had that problem 
LOLNice title
To answer the Q... depends on the valve sizes and runner volumes. Too much can cause lost performance.
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Staging Lane
Joined: Nov 2001
Posts: 68
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From: Sydney, Australia
No such thing as too much headwork...more a case of not enough motor underneath.
I think as long as the heads are good quality and are shaped to provide good flow AND velocity (not just 'hogged out' for maximum flow) , then you'll be fine with bigger flowing heads. Your cam selection should make good power and down the track if you change 'bump sticks' again for a bigger, crankier jobbie, you'll be right to go.
Just make sure that when you get head work done, that port shaping was done with both good flow AND airspeed in mind. This is what gives you the best HP and torque numbers across the rev range (not simply up top).
I think as long as the heads are good quality and are shaped to provide good flow AND velocity (not just 'hogged out' for maximum flow) , then you'll be fine with bigger flowing heads. Your cam selection should make good power and down the track if you change 'bump sticks' again for a bigger, crankier jobbie, you'll be right to go.
Just make sure that when you get head work done, that port shaping was done with both good flow AND airspeed in mind. This is what gives you the best HP and torque numbers across the rev range (not simply up top).