i have a set of 5.3 heads that i am going to get set up and do a a cam and about 3000 stall also spray. not worried just yet about what cam i need, but i need to know what to do to the heads to make them flow better are the valve sizes the same as ls-6 heads? what springs should i use?

 

You'll need to get them ported, bigger valves as well and springs vary upon cam application.

PM or Call Gunnar at Patriot, he could give you a good deal if you're thinking budget.

Otherwise, TEA is a good choice as well, they are a bit more $$ but their heads put out serious power. A stage 1.5 would be great.

On average a port job can run in the $650 neighbourhood (I think that it is what PP charges, Gunnar can tell you)

 

We offer a completely assembled 5.3L head to meet your needs. They are completely CNC ported, CNC valvejobbed, and decked however you would like. These heads come with our PRC Dual Valvesprings good to .660" lift. The only thing budget out these heads is the price. I would put them up against any of the "big-named" heads on the market for 346c.i. motors! Check out the sponsor sale section as we are running some insane specials till the end of the year!!!