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Enthusiast
10-22-2005, 06:58 PM
One of my close friends recently joked about putting an LT5 into his Z28. Then he started thinking that it would be really cool because you don't ever see it (maybe cause you can't do it, don't know yet), very much unlike the LT4 Setup. He found a wrecked ZR1, the engine seems to be in good shape. I think hes really serious about doing this, and he even fully understands how labor intensive this project is gonna be. He wanted me to ask you guys wether or not it would fit, and what the modability on the LT5 is like.
Chris 96 WS6
10-22-2005, 07:56 PM
I think the problem is the LT5 is too wide to fit between teh 4th gen shock towers.

Modability is zero.The only place that does LT5's is lingenfelter, and expect to pay out the wazoo. I've never seen any aftermarket parts for an LT5 anywhere.
Enthusiast
10-22-2005, 09:25 PM
I think the problem is the LT5 is too wide to fit between teh 4th gen shock towers.

Modability is zero.The only place that does LT5's is lingenfelter, and expect to pay out the wazoo. I've never seen any aftermarket parts for an LT5 anywhere.

Thats what I figured about modding it. He's going to measure it tommorrow. I hope he does it. I think it'd be kinda cool.
Chris 96 WS6
10-22-2005, 09:43 PM
It would definitely be unique. GM did one about 10 years ago but as far as I know that's the only LT5 f-body ever done.
Enthusiast
10-22-2005, 09:45 PM
Was it Lotus that designed the LT5?
Chris 96 WS6
10-22-2005, 09:49 PM
Yes, and it was built by Mercury Marine for GM.

And its also the reason we have the LT1. Chevy went to GM powertrain and said they wanted 300hp out of the small block. GM powertrain was adamant that the 245hp L98 was the best that could be done with existing tech...basically that there was nothing left to improve.

When they saw the LT5 and the 385hp it put out, GM powertrain went to work.. I think they got embarrased into making the LT1. That's why it seems like the LT1 used all the tricks in the book...reverse flow cooling, short runner intake & a new cyl head.
contraststriker
10-23-2005, 01:39 AM
LT5 crate engines are god-awful expensive, and used one would hardly be better.
smoknta
10-23-2005, 06:54 AM
I saw one in the Corvette museum down in Bowling Green. They are pretty neat.
1970judge
10-23-2005, 08:41 AM
Big waste. Cant mod it and even if you could mod it its OHC which means its absolutely nonresponsive to things like cams.
transamtom
10-23-2005, 08:56 AM
GM did one in a 3rd Gen.

It looked like it barely fit.

It was on the Camaro Legends tour a few years ago.

IMHO,I would do an LS2 swap,cheaper,easier,it will fit and it has way more potential.
Enthusiast
10-23-2005, 11:44 AM
Hes really not doing it for performance as a top priority. He just wants to do something that will perform decently and no one else has ever done. It'll probably just turn into a show car.
Jpack
10-23-2005, 12:32 PM
Third Gen................ http://www.thirdgen.org/techbb2/attachment.php?postid=1506166
Enthusiast
10-23-2005, 10:05 PM
I think the LT5 would respond great to forced induction, with it being a 4 valve engine (right?). The only downside would be the high compression.
Vendetta
10-24-2005, 12:23 AM
Does he realize exactly how expensive LT5 motors even are?
Enthusiast
10-24-2005, 12:31 AM
He found a wrecked ZL1 Vette. He said it was the 405 hp version and the owner's asking price wasn't to bad.
Chris 96 WS6
10-25-2005, 09:03 AM
Moving to General tech since LT5's are 100% different from the other LT motors.
skewba98z28
10-25-2005, 09:12 PM
If your bud was eventually wanting to go the forced induction route. The LT5 would be good. You could always swap the pistons out to get the compression down. What does the guy want for the ZR1. Here in Corvette Central (Bowling Green) a LT5 with the harness goes for about 8 to 10 grand. I saw one at Street Rod Nationals that Street and Performance had. It was polished out block and all an they wanted something lik 15k to 18k for it. :eek: They are really wide like said before.
Phoenix57
10-25-2005, 09:41 PM
anybody have pics of an LT5? ive heard alot about it, but never have seen one.
Enthusiast
10-26-2005, 12:01 AM
He found a wrecked ZL1 (was rear-ended) the guy wants 12 for the whole car. It's pretty much totaled. My friend says hes getting the engine for 6 grand.
Phoenix57
10-26-2005, 01:45 AM
i would go for it. its probably a major PITA, but thats part of the fun. 6k is not bad really. what about the trans from the vette?
skewba98z28
10-26-2005, 10:28 PM
scroll down on this one
http://www.mcsmk8.com/zr1/90ZR1.HTM
Heres some good pics on this thread
http://www.impalaclub.com/naisso/forum2002/topic.asp?TOPIC_ID=32438

NOtice how wide the intake and heads are.
slpspeeed
10-27-2005, 12:38 PM
An LT5 is basically an LT1 with 4 cams and 32 valves. Im thinking maybe a different intake because that looks like a TPI setup, but i know they were rated at 390-400 horses from the factory and ran 12.9's
skewba98z28
10-27-2005, 05:45 PM
yeah there kinda the same. Except the block is aluminum. They have 32 valves and are DOHC. VTEC huh :lol: Intake does favor a TPI setup. But it is about twice as wide.
Enthusiast
10-27-2005, 11:05 PM
The LT5 was sold to someone else and my friend is currently tring to track another one down.
I told him to just go with an LS7 since the LT5 is gone.
Chris 96 WS6
10-28-2005, 09:20 AM
An LT5 is basically an LT1 with 4 cams and 32 valves. Im thinking maybe a different intake because that looks like a TPI setup, but i know they were rated at 390-400 horses from the factory and ran 12.9's

That's not accurate. its a 100% different block, heads, EVERYTHING is different. The LT5 shares nothing in common with the LT1....the blocks are no where near the same.

They're both V8s, that's about where the similarities end.

375hp from 1990-1992, 405hp from 1993-1995.
67RSSS
10-28-2005, 12:42 PM
The LT5's intake setup was such that a set of butterfly valves closed off 1 set of intake runners to each cylinder making it a single intake valve up to 3500 rpm at which time the butterfly valves opened allowing the 2nd set of runners to be utlized. The valet setting kept the 2nd set of intake runners from opening regardless of rpm, limiting the engine's potential.
santa_rosa_lt1
10-28-2005, 03:36 PM
here is a e-bay 1990 lt5 vette http://cgi.ebay.com/ebaymotors/Chevrolet-Corvette-ZR1-1990-ZR1-Corvette-King-of-the-Hill_W0QQcmdZViewItemQQcategoryZ6168QQitemZ4584740 676QQrdZ1QQsspagenameZWDVWQQtcZphoto
SiCk PuPpY
12-22-2005, 01:26 PM
The LT5 was sold to someone else and my friend is currently tring to track another one down.
I told him to just go with an LS7 since the LT5 is gone.

If he is looking for exotic and to have the "Wow" factor, the LS7 would be the ticket; but it does cost around $18,000.
technical
12-22-2005, 03:30 PM
I just remember everything being more difficult to work on with ZR-1's except changing the plugs. That and the owners never left the valet key. :lol:
Karps TA
12-22-2005, 03:45 PM
If he really wants to be different he should go with an Iron Duke 4cyl and a T56. lol
Vendetta
12-22-2005, 11:40 PM
An LT5 is basically an LT1 with 4 cams and 32 valves. Im thinking maybe a different intake because that looks like a TPI setup, but i know they were rated at 390-400 horses from the factory and ran 12.9's

If you don't know, please don't speculate... Chris already cleared this up. But this is how misinformation gets passed around.