Bradlyj8Z28

iTrader: (4)

I was hoping to get some opinions. I see some people making great power with only hedders and a RAPtr cam from ThunderRacing.

Here are the specs,

" RapTR" - 236/242 - .615/.615 - 111 lsa 3000-6800 RPM

I have 1 7/8 StainlessWorks hedders with 3 inch primaries going into a 3 inch exhaust with a 2 chamber Flowmaster. Other than a K&N cold air and underdrive pulley the engine is a stock 2002 SS engine with a 6 speed. Has about 50k and I plan to add Katech rod bolts.

Now my question, I am looking at these heads;

****Patriot Performance CNC Ported 243 LS6 / LS2 2.055"/1.57" 64cc Heads Assembled

Part Number: 198-2031

Technical Specs:

Combustion Chamber: 64cc
Intake Runner: 227cc
Exhaust Runner: 70cc
Intake Valve: 2.055"
Exhaust Valve: 1.57"
Max. Valve Spring Lift: 0.650"
Spring Pressure Closed: 135 lbs. @ 1.800"
Spring Pressure Open: 375 lbs. @ 1.090"
Retainer Material: Titanium
Valve Seal Material: Viton
Valve Guide Material: Manganese Bronze
Valve Job: 5-angle


****Patriot Performance CNC Ported 5.3 2.02"/1.57" 63cc Heads Assembled

Part Number: 198-2027

Technical Specs:

Combustion Chamber: 63cc
Intake Runner: 220cc
Exhaust Runner: 67cc
Intake Valve: 2.02"
Exhaust Valve: 1.57"
Max. Valve Spring Lift: 0.650"
Spring Pressure Closed: 135 lbs. @ 1.800"
Spring Pressure Open: 375 lbs. @ 1.090"
Retainer Material: Titanium
Valve Seal Material: Viton
Valve Guide Material: Manganese Bronze
Valve Job: 5-angle


****PRC 227cc CNC Ported Small Bore 3.9"-4" Cylinder Heads

* 227cc Fully CNC Ported Intake Runners
* 84cc Fully CNC Ported Exhaust Runners
* Small Bore Chambers For Increased Horsepower & Torque+ SPECIFICALLY DESIGNED FOR 3.9"-4" BORE APPLICATIONS
* PRC Spring Kit Rated To .650" Lift
* 62cc CNC Machined Chambers
* 2.06" Intake / 1.600" Stainless Valves
* Factory Rocker Friendly!!*


Opinions? Recommendations? These are in the price range I wanted to stick with. 1200-2200. These are not hard and fast choices. I dont want to fly cut the pistons. Just a simple head and cam swap. Thanks.

Mazzenger

iTrader: (5)

I would call up Thunder Racing and ask them, since they created the cam.
Out of the three listed - PRC 227 - would be my choice.

Bradlyj8Z28

iTrader: (4)

I did call them. They suggest Trickflow 215s. I just haven't decided on how much I want to spend yet. That is why I wanted opinions on the best head out of the three I listed because they are a lot cheaper.

BobDoLe

iTrader: (11)

out of the three, i would go with the PRC 227, then the patriot LS6 heads. i'm no expert, though.
if you're on a budget, you would really benefit from a call to texas speed about your specific application. i'm pretty happy i listened to their advice.

is this going to be a street car by any chance?