I have a question for you guys....I have only modded LS motors, and have only had 1 LT1 which I only had a short time and left stock. Im looking at a '92, 6spd, Corvette. The guy said the car has head work and a Hot cam, and put down 380 rwhp. I believe it has the LT1 casting heads. It looks to have the stock LT1 intake on it still. Not sure if it has rockers or anything else done to it. It was modded previous to him , so Im not sure if he knows exactly what was done to it. But he did have it tuned and has a Dyno sheet for the 380. So what Im asking is that possible with an LT1 motor m6 with those mods?

 

A lt1 with headwork and cam/tune can put down 380 no problem.

 

380rwhp is easy. Take the valve covers off when you get a chance to see what components was done. A stock LT1 manifold ive heard is good to about 600hp.

 

Edelbrock is the only easily available aftermarket LT1 intake and it seems to offer the possibility of LOST power so a stock intake is not a bad sign, guys have done over 400rwhp through unported stock intake NA.

IMO 380rwhp with a HOT cam and head work is a bit higher than I would have expected but not unbelievable. Hell ported OEM heads/cam LT1s can go over 420rwhp so 380 is not an unreasonable claim.

 

It's very easy to keep a stock look with a heads and cam package. Does he have headers? I would ask him to pull a valve cover off to see if he has roller rockers. Did he tell you what kind of rockers he has or he has no clue?

 

Thanks for the replys. I forgot to mention, yes it has headers, no cats, and not sure on the mufflers.

 

380 is on the high side for the average hotcam car IMO, but its not impossible. It will take good head work and supporting mods, but from the sound of it the guy at least didn't just throw magazine parts at it so it should be around there.

 

Yes that's very doable with decent heads and good tuning. If it was mine I'd swap that hotcam out for something else to gain 20-40rwhp.

 

Id pull the driver side valvecover and take a peak at the rocker setup. How does the idle sound, choppy?

 

I made 340 at the wheels with 1.6 rockers .505lift 220dur, stock heads, muffler delete, stock exhaust manifolds and intake, PCM4less tune. On a 150 wet shot just short of 470. With good heads (LE)and bigger cam, I think 400 n/a would be easy numbers and well over 500 squeezing it.

 

Thanks for the replys! I havent heard the car yet as its in another state. I wanted to see what you all thought of the claim. I want to get some more pics of it before I make the drive. Im glad you guys replyed.

 

There isn't much aftermarket support for the LT1 intake manifolds. Edelbrock is about it besides a GM LT4 intake (which needs to be mated with LT4 heads), or a custom/single plane intake. Hogan also makes an intake, but it's thousands of dollars lol.

Ported factory intakes have been used on just about every application you can think of from FI, supercharged/turbo cars, big NA motors, ect with success. The intake has been on many single digit 1/4 mile cars, so it's not really an issue.

As others have said, with some port work, 380rwhp is achievable. Some people see 400-425rwhp through an M6 with just ported factory heads/cam packages.

Also, for what it's worth I've saw a partial bolt-on (!cats, shift kit, gears, DR's) run into the mid 11's on a cheapo universal 150 shot kit in the 1/4. Pretty damn impressive.