Tea stage 2 243 heads
The stock snout on the LS6 is too small. The TPIS/LPE 90mm snout for the LS6 intake picks up 15+ cfm of air flow with the heads I've tested. This flowed about the same as a Fast 90. Cost $350 plus new TB
The Fast 90/92/102 are great options with more potential ported. Cost $550 to $850 depending on new or used plus TB.
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90mm LS6 can be a handy alternative. The 90mm snout LS6 flowed 265 cfm in my testing. Porting didn't help much. The 90mm .snout LS6 will be maxed out at ~270 cfm.
The Fast 90/92 also flowed ~265 cfm but when Fast 90/92 are ported they can flow 275-280 cfm. With bigger cams and high rpm, the bigger runner / plenum Fast intakes will make more hp.
These two companies can provide the 90mm snout mod for an LS6 intake.Lingenfelter Performance Engineering - LPE and Tuned Port Induction Specialities - TPiS
I have an 90mm LS6 on my LS1 383 91 RS with small 229/229 cam I'm happy with it.






