scotty230

hey guys i just picked up a 94 z28 m6 with only 60xxx on it and the car runs awsome but i have a chance to pick up a complete built lt4 for a real good price, is it worth doing the swap or not. the motor in hand has about 5xxx on it and here are the specs ( sort of vogue)

lt4 block bord .40 over
SRP forged pistons( 11.1 i think )
lt1 rods
stock balanced crank
lt4 heads workd and port matched intake
545/545 lift comp cam
1.6 rr
30lb injectors
hooker lt

i was told that the motor made a little over 400whp, and the guy i am gettin the motor from is also throwing in a nx progressive nos kit,

i was thinking withi this motor and say a 200 shot the car should be a real fun street ride

thanks for your advice guys

ZONES89RS

iTrader: (25)

Sounds good if the price is right, a stock LT4 i would say yea with a cam swap, good luck.

scotty230

thanks yea it has ported and polished heads and intake, and i can get the motor with lt and progressive nos kit for 2000 plus my stock lt1, so the lt4 with the heads worked and cam shoujold make 400 whp
thanks

That_guy

iTrader: (1)

do it and kick some ***. The lt4 only came with the zr1 vettes right

96capricemgr

iTrader: (1)

The LT4 is not "all that" and even if it made power on the dyno it does not mean it will make a car fast. The LT4 heads are arguably too big for a near stock displacement motor at rpms our pcm is capable of. Even on strokers I am yet to be convinced ported LT4s are worthwhile over ported LT1 castings. Look for RESULTS rather than some kids who know nothing telling you what you want to hear.

It was not a ZR1 Vette thing it was a Grandsport thing the ZR1 got the LT5 which is not an LT1 derivative.

mpe331lx

iTrader: (5)

The lt4 was only available in the 96 Vette's, it was featured in the Grand Sport, but all 6 speed Vette's in 96 came with the LT4 (all Grand Sports were 6 speeds). All autos had the lt1.

That_guy

iTrader: (1)

O ok then i hear that i could kick some ferraris and lamborghinis asses back in the day.

97blkz

iTrader: (1)

Do not always believe what your told, did he have flow #'s for the heads? Cam specs to include lsa etc?? dyno sheet? ET slip? And what is a real good price?

96lt1m6

iTrader: (31)

lt4 camaro SS 1997 330hp 107 were made 100 were sold to public
lt4 birds 1997 330hp not sure but i think 31 were built and sold to public

396D1SS

iTrader: (21)

I played with alot of heads on my old 355, going from a LE3 lt1 head to a LE3 lt4 head and intake you can and will tell a pretty good difference. I ran around 4 tenths faster with the lt4 stuff. I was shifting each setup around 6700rpm

METAL MANIAC

Would you please elaborate a little more on the statements you are making..the heads are too large for a 350? Maybe even a 383? I would think not, but I would like to hear your reasoniing behind it.....MM

My94TransAm

Doesn't the LT4 conversion kit claim 425hp at the motor?

scotty230

thanks guys i think i might jsut do it and i have seen slips were it has ran 11.9 all motor and 10.8 on the spray and that was in a full size truck that he had stuffed it in, i dont care if its making all the power that he says it is, all i was wondieng is if the lt4 block and heads are better than the lt1

396D1SS

iTrader: (21)

Yes thats what it claims. The LT4 hotcam is what really holds it back. A few people in here that say the LT4 head is to big for a 355 BUT if the LT4 heads and intake have an equal amount of work on them I dont care if you have the little bitty 4.8 liter LT1 or a 396 it will go faster. I have played time and time again with LT1/4 stuff and the LT4 will always make more power and run faster times IF they are both ported/valved for MAX power. If you can find a set of lt4's for cheap it would be a good idea to pick a pair up. If you are on a budget I would get some LE LT1's

thats just my .02

396D1SS

iTrader: (21)

4 bolt main block, RR's,better crank, more compression,better heads,a cool red intake

96capricemgr

iTrader: (1)

https://ls1tech.com/forums/lt1-lt4-modifications/432878-different-lt1-intakes.html

Here is one place we debated it and even Ed Wright agrees with me that on a 350ci motor held below 7200 LT4s are not the right choice.

Now I do not want to sound like I am taking a shot at Ed's accomplishments with his car but with guys like Rick Abare running basically the same times with ported LT1 castings and Mike Harris BRACKET racing his Impala at 10.8 NA both of these guys with AI 200 CC LT1 castings I have to question how much better the LT4s are even on a stroker. Ed's 9.9 is clearly impressive I am not trying to take anything away from his accomplishment, I just think it very interesting one of his customers is running about the same times with LT1 castings.

You people need to drop the bench racing once in awhile and observe reality. Reality is the guys who try to go fast with LT1 castings do go fast, fast enough that those who jump on the LT4/aftermarket bandwagon need to scratch their head a little and rethink their combos.

I am not talking dyno numbers or flow numbers look at real ET/MPH for street cars especially.

This is like the whole AFR thing people say how great something is based on marketing more than anything else, look for results. Ported LT1 castings have to make you take notice when looking at actual performance numbers.

scotty230

thanks guys i wasnt trying to get everyone worked up i was just wondeirng if it was a good upgrade from the stock lt1 and 396d1ss do u ever go to bradenton motorsports, from readig your car setup u sound liek the guy that has that bad *** orange f body that is wicked fast

METAL MANIAC

True but if you can get a set of lt4 heads for reasonable they will flow damn near as good as a set of ported lt1 heads...that is what I did and I dropped
430 rwhp (after correcting a high rpm miss...opti)...this is from a port matched set of lt4 heads...gm847...383

96capricemgr

iTrader: (1)

What does it run at the track? Dyno numbers do not always mean good ET.

There is a guy on the Impala board who with a 150 shot on his XFI cammed(230/236) ported LT4 setup has equalled my best NA MPH and is slightly behind in ET. His heads flow more than mine and he runs more stall.
The XFI ginds are another example of what is supposed to be the "best" but it is all theory and little to nothing to back it up.

METAL MANIAC

I understand what you are saying, but numbers don't lie...dollar fro dollar if you can get you're hands on a set of lt4 heads for a good price you are better off...MM