LS1TECH - View Single Post - New Build. Procharger or NA? Best bang for the buck

candlelit · 10-27-2008, 06:33 PM

that GTO is one nasty car!

I was thinking about selling him on swapping out the heads & head gasket to bump the CR of my 347 to apprx. 9.3:1 and all he would have to do is buy the kit, no worry about pulling motors/etc. BUT... I came across some Procharger dyno/track numbers and it seems the average 347 is running high 10's @ mid 5xx rwhp & only about 630rwhp @ 12-14 psi. Plus tq isn't very high on those ls1's. I seen a ton of 408's run 10's all day, with near 500rwhp & 470+tq with good set of heads, nasty cam, & fast intake. Like someone else mentioned, reliability & easier to tune, plus perhaps saving some cash will make me wanna sway him toward NA.

Hmmmm. Let's say I sway him toward a NA build. What CI would you guys recommend to be the most power for the buck? I know aluminum saves only about 40-70 lbs, so it's not that big of a deal to go iron.

10-27-2008, 06:33 PM	#8
candlelit TECH Resident Trader Rating: 13 Join Date: Oct 2006 Location: Stillwater, OK Posts: 958	that GTO is one nasty car! I was thinking about selling him on swapping out the heads & head gasket to bump the CR of my 347 to apprx. 9.3:1 and all he would have to do is buy the kit, no worry about pulling motors/etc. BUT... I came across some Procharger dyno/track numbers and it seems the average 347 is running high 10's @ mid 5xx rwhp & only about 630rwhp @ 12-14 psi. Plus tq isn't very high on those ls1's. I seen a ton of 408's run 10's all day, with near 500rwhp & 470+tq with good set of heads, nasty cam, & fast intake. Like someone else mentioned, reliability & easier to tune, plus perhaps saving some cash will make me wanna sway him toward NA. Hmmmm. Let's say I sway him toward a NA build. What CI would you guys recommend to be the most power for the buck? I know aluminum saves only about 40-70 lbs, so it's not that big of a deal to go iron. __________________ 98 White TA... project. HPE Heads/Cam, Fast 90/NW 90, Moser 12 bolt, Built 4l60e, TCI 3400, B&M cooler, YT roller rockers, QA1 12 way adj, BMR & Hotchkis suspension, Racetronix fuel pump, 6 pt, Dry NOS, Drilled/Slotted rotors, Kooks 1 7/8", Borla, Raptor hood, etc.