I'm building a forged motor to probably be used with an STS turbo kit. I have my choice of heads right now, and the L92 heads/intake combo seem an awesome combo...but most of the tests I've seen are with NA engines. Would FI actually benefit as much, or is there a better option? The L92 combo price is also hard to beat.

Thanks

PS...Not sure my bore at this time but it's probably between 370 and 408 when complete (on 2003 AWD escalade)

 

I have read over on tech if you get pretty high PSI, as with any factory cast, they will lift

 

I'm looking for 600rwhp, and 12psi max. I was hoping for the same PSI, these would give me more power.

 

fyi 370 and 408 have same bore but 408 has 4" stroke crank

 

If the L92's aren't the best option for FI, then what's better for the same $$$?

 

AFR's are proven to work wonders with FI. ETP arnt to shabby either.
What size turbo are you going to run????

 

Not sure at this point. I had planned to start another thread to ask that information. I'm all ears if you have any ideas.

 

You need to run at a minimum of a 76mm with a .96 housing to make power with that 408.

 

Yeah, but many have proven that if you run arp studs tq'ed to 80-85lbs with factory MLS gasket they will hold pretty well. Slowhawk swears up to 1000 hp with factory castings. But I dunno for sure. If you stay in the 10 psi range factory heads should be just fine.

 

If I remember right, Parish went close to 900rwhp on boost and 1000 with a little spray on his stock 317's before he finely broke down and bought a set of AFRs