Scoulter

Ok, So my 1999 SS M6 has 325HP at the flywheel stock right? I have read our camaro LS1's are underated because GM wants the Corvette to be the Big Dog in HP. So my question is what do we really have at the flyweel/rear wheel? My car is stock for the moment, I have ordered the SLP CAI and SLP LM with "Y" pipe. No one around here offers a dyno so I have no idea what I have to start with. Has anyone got any REAL numbers on a stock Camaro LS1? I would like to know before and after mod HP or best guess since I can't find a dyno close.

Thanks and help me if you can. S.

BadassblackTA

The corvette and f-bodies both have the SAME LS1.

Scoulter

Yea, I know they have the same motor, besides 2 bolt/4 bolt mains and some other small differances. My question is has any one dynoed a stock F body LS1 and does anyone know for a fact what the HP really is?

Zerocool

last time i checked LS1's have 6 bolt mains, old LT1's and LT4 had the 2bolt/4 bolt main set ups

2bolt=fbody lt1
4bolt=corvette lt1/lt4

correct me if im wrong

BadassblackTA

It varies from car to car and year to year, i've seen dynoes as low as 290 (98) something and as high as 320 (02). rear wheel hp, that is. Every car is different, but depending on your year and transmission, you can have anywhere around 300.

Scoulter

Well, shows ya how much I know. I have owned two LT1 Z28's I guess thats where I was getting the Bolt numbers. Do LS1's really have SIX Bolt mains? Wow. Cool

BadassblackTA

I think its only the LS6 block that has the 6 bolt main, and some 2001 and 2002 cars had those, as for the LS1 block, i dont know.

Capn Pete

No, all LSx blocks have 6-bolt mains. 4 in from the bottom, and 2 from the sides (1 from either side I mean). AFAIK, it's the same for the 4.8, 5.3 and 6.0L truck engines too. Remember, the LS1 is a Gen-III SBC, whereas the LT1 is a Gen-II, and closely resembles the original Gen-I SBC's.

In regards to power, LS1's dyno usually around the ~300 rwhp mark, which when converted to crank HP (assuming ~15% drivetrain loss) comes out to ~350 HP.

Oh yeah, another thing. The heads on LS1's are totally different than tradition SBC's. The valve arrangement is also I,E,I,E,I,E,I,E same as BBC's are.

BadassblackTA

Not just he heads, the entire engine is redesigned from scratch. which is why its 346 cubic inches instead of the traditional 350

Scoulter

Thanks for your help guys. I will try to find someone around here with a dynojet. I would love to know what I have before I start my Mods.

Thanks again!

Capn Pete

I know, the blocks are totally different and everything. They are considered a "deep skirt" block, which is how the 6-bolt design is incorporated. The block extends below the crank, so that the bearing caps are inside the block and take the bolts from the outside of the block into them, as well as the 4 bolts from the bottom.

The basics of the rotating assembly don't make the difference though, that's why I commented on the heads, because IMO that's where the real difference lies between Gen-I / II and Gen-III engines.................it's too bad you can't bolt LSx style heads onto an LT1. There would be no need to do a full "LS1 conversion" if the heads would just swap over.

97WS6SCharged

LSx heads are also 15 degree heads. And the LS1 achieves it 346 CID with a totally different bore/stroke ratio than the old SBC.