87turbo2

iTrader: (-1)

Does anyone have a Lt4 head and cam car? I was told my car is a LT4 but red paint was sandblasted off to get by dealership to keep it under warranty. but, when I had it dyno'd the guy said it was a LT1 because he said it was LT1 injectors. I have receipts for a head, a cam, 52mm Tb, jet hot headers, i think an "underdrive" pulley?, 3.73 gears, cat back,SLP CAI, cross drilled / slotted brakes, and the boyd Coddingtons. I know the headers are gone, because it has stock manifolds on it. I dyno'd the night I got the car. It ran 296.7rwhp and 306.7 ft/lbs tq and it was real lean. The computer aborted it every single time just as soon as he got on it because it was leaning out. he said the car pulled hard, but whatever, he was getting paid, so I dont know.
But back to the point, I'd like to see what other Lt4 cars are putting down. I have no intention of running NOS, so headers and a TC are about it for now.

Thanks guys!

infinitebird

iTrader: (11)

Those numbers seem too low for it to have the lt4 heads/cam. Looks more like what a regular LT1 would put down with catback/cai/headers.

87turbo2

iTrader: (-1)

I seem to be hearing that from 1/2 the people and the other 1/2 say Lt4, BTW I have stock exhaust manifolds, no headers.

blkchevyz

doesnt the lt4 intake not have an egr port on the back? or at least isnt it blocked off
i know that can be changed but take a look


really i dont think your going to seem too much of a change from stock lt1 heads and cam to lt4 head and an lt4 cam(not the hot cam)

those numbers dont seem bad at all for an auto with stock manafolds

BlackScreaminMachine

iTrader: (17)

Well a LT4 motor offered in the Grand Sport vettes had a smaller cam than a LT4 head HOTCAM combo. As far as EGR, i am 99% sure LT4's also included that. As for identifiying a LT4 intake and heads, you'd need to get the casting numbers off of the head.

Otherwise at worst someone took the intake and just had it powder coated red. If its running lean, get a tune

METALBEAST

iTrader: (1)

That's about what a stock LT4 SS, Firehawk, Grandsport would put down through an M6. With stock manifolds, the LT4 cam (not hot cam) and the bolt ons you have described it is very plausible. However, I have never heard of anyone sandblasting their LT4 intake to mak it look like an LT1 intake

blkchevyz

yeah i agree


i guess if you really want to know look around for a casting number.

Redneck Z

iTrader: (3)

The thing is, he doesn't have headers. Personally that's what I'd expect a car with just the LT4 heads/cam and stock exhaust manifolds to put down.

87turbo2

iTrader: (-1)

He said the previous owner had sandblasted it because he did the swap while the car was still under warranty and going to the service bay and seeing a bright red intake may have given them reason to ? void his warranty. how can I check if its a LT4?!?!?!?!?! Tell me where to look for certain things and I'll do it! Please try to be specific, i havent driven a piston car in a while (13 rx7's)

Thanks,
Devon

96capricemgr

iTrader: (1)

I would pull a valvecover and look at the head casting number.

From what you are describing of power through manifolds and being exessively lean I agree with those here who think it might actually be LT4 parts.
I also think you need to make sure it is programmed for such after you verify the head castings, that might be all it takes to correct the lean condition..

87turbo2

iTrader: (-1)

Thanks, I'll try to get a look at it this weekend.

METALBEAST

iTrader: (1)

I understand that. It just sounds a bit fishy. There are some shady characters out there. But like I and others have said, the numbers do make it plausible. Check the heads and let us know

87turbo2

iTrader: (-1)

Will do, I'll try to get a vid to post of the car running and some under hood shots. have to figure out how to host 'em...

METALBEAST

iTrader: (1)

Setup a photobucket account for the pics www.photobucket.com

StripedZebra

iTrader: (6)

LT4 intakes dont have EGR on the back of them.

BigCamLT1

I used to have the lt 4 set up and I put down 323hp and 334tq and that was untuned and that was on Dyon Jet dyon

zlover129

iTrader: (10)

did you have long tubes or something? because if you did then that would probably make up for the 20 or so hp difference, if so then i believe the guy wasnt lying to you about whats on it

infinitebird

iTrader: (11)

Yeah my bad, I didn't read the post closely enough and didn't see where he said the headers were gone. 296 does seem a bit high for an auto with stock manifolds and those other mods, so it is possible.

87turbo2

iTrader: (-1)

I have a webshots account, I was hoping a buddy of mine could come over and shoot a vid. The only thing I have is a crappy video phone. I just have no idea where to put those up.

87turbo2

iTrader: (-1)

Well my crappy pc wont let me load my Tmobile vids of the car. It also said the the .tmi cannot be converted to another format. I'll try again guys!