PRC 5.3's vs PRC 243's, and cam
 

Was wondering what would be best for my CTS-V. I'm looking at the PRC stage 2.5 5.3's and the PRC stage 2.5 243's.... I like the idea of the bump in compression on the 5.3's. Which head has the best runner shape for velocity as I'm staying N/A??

Was also looking into a cam, something on the smaller/stealthy side, to keep the caddy.... A caddy lol. Maybe a 224/220 .600/.600 116+2 on the XE-R lobes.

The car will also have 1 3/4" Kooks with cats, do u think 500rw is possible with this setup?

either head is fine, you know you can have them mill the 243 head down. My 243's are at 61cc which is roughly 11.1.

The 224/220 cam an those heads are not going to come close to 500rwhp, you are honestly looking at 400ish rwhp numbers.

Is the cts-v a 5.7L?

thought the CTS-V was an LS6...?

Ohh damn I'm way off. Excuse me, I just got out of the mustang game. Still don't know what to expect with these motors. Lol I just want a set of cnc'd OEM casting heads, with about 11:1 and something in the area of a 220 cam on a 116 to keep the idle stockish and +2 to bring the curve down some. If 400 is all I'll get then so be it.

And yes. 05' LS6 car. Just got it 3 weeks ago, with a intake I ran 13.4 @ 111.