LS1 or old school small block? - F-Body Road Racing and Autocross Forums

I'm building a 67 RS autocross/track toy that can still be street driven. So far the car has a custom front clip with C5 corvette suspension and a C4 corvette IRS out back. Sitting in the car now is a small block and a NASCAR built super T10

My son blew his LS1 motor on Sat and scooped up a longblock locally, I now have a LS1 at my disposal (if it's rebuildable) Between he and I we have enough take off parts to pretty much make a complete motor minus the accesories.

So here's the question. Should I continue to keep the SBC that's in the car now or go with the LS1?

The SBC is a destroked 400. 4 bolt main, steel crank, wiesco pistions and chevy pink rods. Heads are 441's with 2.02 1.6 valves, fully ported and port matched to the headers and intake. Intake is an old school torquer single plane. Carb is a 650 mech. Estimated power around 425 or so.

LS1 would be a mild build with the usual bolt ons. Custom mega squirt efi controller, maybe put a carb intake on it and use the 650?

I would keep the Super T10 trans (4speed) that I have now in either case.

At this point on the car, I still have to do the fuel system and the wiring so either route logisitcally would be the same.

Anybody know the weight difference between a iron headed SBC and an LS1? What would you guys do if you had the choice?

Beach Cruiser View Member Profile	Feb 22 2011, 06:05 PM Post #1
Advanced Member Group: Advanced Members Posts: 264 Joined: 31-July 07 From: Virginia Beach Member No.: 1,870	I'm building a 67 RS autocross/track toy that can still be street driven. So far the car has a custom front clip with C5 corvette suspension and a C4 corvette IRS out back. Sitting in the car now is a small block and a NASCAR built super T10 My son blew his LS1 motor on Sat and scooped up a longblock locally, I now have a LS1 at my disposal (if it's rebuildable) Between he and I we have enough take off parts to pretty much make a complete motor minus the accesories. So here's the question. Should I continue to keep the SBC that's in the car now or go with the LS1? The SBC is a destroked 400. 4 bolt main, steel crank, wiesco pistions and chevy pink rods. Heads are 441's with 2.02 1.6 valves, fully ported and port matched to the headers and intake. Intake is an old school torquer single plane. Carb is a 650 mech. Estimated power around 425 or so. LS1 would be a mild build with the usual bolt ons. Custom mega squirt efi controller, maybe put a carb intake on it and use the 650? I would keep the Super T10 trans (4speed) that I have now in either case. At this point on the car, I still have to do the fuel system and the wiring so either route logisitcally would be the same. Anybody know the weight difference between a iron headed SBC and an LS1? What would you guys do if you had the choice?

matt f View Member Profile	Feb 24 2011, 04:06 PM Post #2
Member Group: Advanced Members Posts: 175 Joined: 18-February 04 Member No.: 228	When I finally get to redo my 67 Nova SS, it will be w/ an LS 1. My camaro dynoed 375 at the wheels w/ bolt ons, cam, and tuning for torque. Mild porting would get it easily to 400, and mileage has dropped to 26 highway from 29. in the Nova, which is 500 lbs lighter, w/ a converter, that would be damn close to 10's on the dragstrip, as the camaro ran 11.89 as a bolt on car. If you do the LS1, please leave some links/tech for all who may follow...