I received my Patriot Performance Stage II 5.3 Heads last night. They are awesome! The difference is amazing. Thanks Gunnar! Patriot Performance has awesome customer service and great products. I'd recommend them to anybody who is looking for quality heads at a great price.

I will post some pics of them later today when I get off work. Until then, here is the flow numbers.

Lift-- .100 .200 .300 .400 .500 .550 .600

Int. 73.8 -- 142.7 -- 200.7 -- 242.4 -- 279.0 -- 289.1 -- 296.2

Ext. 61.5 -- 108.8 -- 148.1 -- 185.1 -- 209.5 -- 216.5 -- 223.1


These are with 2.02/1.57 Manley valves. How do they look?

 

flow numbers look good.

what are the intake/exhaust runners cc's?

 

Thanks! I don't know, hopefully Gunnar will chime in and let us know. If not, I'll e-mail him or something.

 

Let me know if you get any dyno number or 1/4 times. I'm going with the Patriot 5.3s but I'll be getting the Stage 3. Should flow right at 300 @ .6

 

Without Pics!


sorry just had to.

 

Mine are were bought in early 04 and had 214cc Intake runner.

 

I added a few pics to the link in my sig. Go under "Engine Parts" or album #1.

 

I was curious about getting rid of the cnc lines on the heads. Not that they're bad or anything, just always here about people getting they're heads polished. So I called West Coast Cylinder Heads and asked them about it. They said they could, but it would only be about a 1-2% gain in airflow based on their experiences. So, basically not to have the hand finished. The sponsers on here know what they're talking about, so I'm gonna go with what they say. Just letting ya'll know what they said.

 

The intake runner will be 215 +/- and the exhaust 77 +/-. Glad you like the heads and the customer service ! Keep us posted on the numbers you get.

 

Good info & numbers on the heads.

Gunnar, I sent you an email for advice about using these & one of your cams w/ a 5.3 motor.