Does this LT5 have a prototype plenum? - ZR-1 Net Registry Forums

bdw18_123 · 08-06-2010

Came across this auction today on eBay.

http://cgi.ebay.com/ebaymotors/Chevr...Q5fAccessories

Looks like it has a prototype plenum on it as the pipes on both sides are all metal with no rubber parts. Also, PCV pipe from the TB to the PCV valves is some kind of weird black pipe that doesn't have the tabs to mount to the plenum. Wonder if that LT5 could be a really late prototype that was just before the production ones? Would be interesting to know what the VIN stamp says.

And the guy thinks it's a '95 LT5 (claims it came out of a '95 ZR-1), which it clearly isn't if the cam cover emblems are the originals. Looks like a '90 LT5. I sent him a message letting him know.

Locobob · 08-06-2010

Looks like it might be a late prototype, certainly not a 95 - no EGR, dual throttle cables.

Aurora40 · 08-06-2010

The plenum seems pretty normal to me? Though I'm no expert. But it has early exhaust manifolds, no EGR, and a black-label trans, not to mention the cam emblem. Seems pretty likely to be from a '90 and unlikely to be from a '95.

Aurora40 · 08-06-2010

That PCV pipe is interesting. It appears to be bent properly, but appears plastic vs metal.

tccrab · 08-06-2010

The hard lines on the plenum indicate pre-production.
I've never seen a PCV setup like that from the factory.
It could be that someone put an early plenum on a '90 engine.
Would be interesting to see the VIN.

TomC
'Crabs

Corvettes White · 08-06-2010

The yard selling the engine gets prototype parts & cars from GM for crushing.

George

phrogs · 08-08-2010

that motor looks like a 89 motor. not a prototype it is a pre production engine.

and the price looks pretty good to me $4,000 for motor tranny and cpu..

08-06-2010	#1
bdw18_123 Join Date: Apr 2009 Location: Prather, CA Posts: 809	Does this LT5 have a prototype plenum? Came across this auction today on eBay. http://cgi.ebay.com/ebaymotors/Chevr...Q5fAccessories Looks like it has a prototype plenum on it as the pipes on both sides are all metal with no rubber parts. Also, PCV pipe from the TB to the PCV valves is some kind of weird black pipe that doesn't have the tabs to mount to the plenum. Wonder if that LT5 could be a really late prototype that was just before the production ones? Would be interesting to know what the VIN stamp says. And the guy thinks it's a '95 LT5 (claims it came out of a '95 ZR-1), which it clearly isn't if the cam cover emblems are the originals. Looks like a '90 LT5. I sent him a message letting him know. __________________ [IMG]http://i13.photobucket.com/albums/a292/bdw18_123/_zr1netforumsigphoto.jpg[/IMG][B] 1990 Corvette ZR-1 [/B][I] White/Flame Red, #2299, mostly stock, 144K miles.[/I] -Cams timed to the '93-'95 405HP LT5 stock timing. -IAT sensor relocated to below front bumper. -Haibeck hoops installed in airduct. -OBX cat-back exhaust. [COLOR=DarkRed][B](SOLD - December 2012 [/B][/COLOR][COLOR=DarkRed][B]:hello:)[/B][/COLOR] 1993 Corvette Coupe Black/Black, 6-speed (SOLD - October 2009 :hello:)

08-06-2010	#2
Locobob Join Date: Jan 2004 Location: Portland, OR Posts: 1,057	Re: Does this LT5 have a prototype plenum? Looks like it might be a late prototype, certainly not a 95 - no EGR, dual throttle cables. __________________ Robert ZR-1 Net Registry Oregon State Director 91 ZR-1 #431 Black/Black LPE 368

08-06-2010	#3
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,713	Re: Does this LT5 have a prototype plenum? The plenum seems pretty normal to me? Though I'm no expert. But it has early exhaust manifolds, no EGR, and a black-label trans, not to mention the cam emblem. Seems pretty likely to be from a '90 and unlikely to be from a '95. __________________ Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img]

08-06-2010	#4
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,713	Re: Does this LT5 have a prototype plenum? That PCV pipe is interesting. It appears to be bent properly, but appears plastic vs metal. __________________ Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img]

08-06-2010	#5
tccrab Join Date: Oct 2004 Location: Folsom CA Posts: 1,653	Re: Does this LT5 have a prototype plenum? The hard lines on the plenum indicate pre-production. I've never seen a PCV setup like that from the factory. It could be that someone put an early plenum on a '90 engine. Would be interesting to see the VIN. TomC 'Crabs __________________ TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B]

08-06-2010	#6
Corvettes White Join Date: Dec 2003 Posts: 475	Re: Does this LT5 have a prototype plenum? The yard selling the engine gets prototype parts & cars from GM for crushing. George

08-08-2010	#7
phrogs Join Date: Jul 2004 Location: Kalamazoo MI Posts: 1,740	Re: Does this LT5 have a prototype plenum? that motor looks like a 89 motor. not a prototype it is a pre production engine. and the price looks pretty good to me $4,000 for motor tranny and cpu.. __________________ JOHNNY P Currently own 90 ZR-1 #845 DRM 500 engine package 90 #226 Parts car Hit me up if you need anything.