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Custom is kewl for valve clearance and big torque with better velocity in thr port design. Say like Mast motorsport, PRC, AFR, etc.
Ported stockers are really good; FED, TEA, GPI are smong my favorite shop to have it done.
Going cathedral would negate the benefits of running a bigger cam. Its a big no imo. So many option for ls3 manifolds and huge big flow numbers make power...youre going in the wrong direction for sure.
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13' 1LE
Old setup: TSP 231-236/Tick 660/.105 PR, UDP, SW LT 2'' & HFC, stock NPP & H pipe, VR-DRX CAI, air scoop, Goertz1 manifold, 102mm BBK, 26" Toyo DRs, Forgestars R17x10 & F18x8, rear seat delete, remote Pat G tune Autocal, 7400 limiter, Spec Mini Twin. 91oct. 11.90@122.3, 0-60ft 2.0 / 11.99@123.6, 0-60ft 2.1 DA+819 ...519RWHP SAE
Solid roller SBE LS3, FED, LLSR, 91oct, 605rwhp N/A. Tuned by Pat G. Build by me.
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