LT1 Corvette engine differences
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Joined: Feb 2000
Posts: 1,445
From: Seattle, WA
- Y-body was a shorter crank hub.
- Y and B-bodies had 2 knock sensors, F-bodies had 1.
- Y-bodies had an oil temp gauge, F-bodies do not (although the mounting boss and PCM pin/programming is there to recognize one if you want to install it).
- Y-bodies had dual exhaust, F-bodies had Y-pipe configuration that split back into dual tips/
- Y-bodies had 4-bolt mains, some 93 F-bodies and all LT4 F-bodies did as well.
- There were some very minor cam differences year to year, but this goes for B bodies as well.
- Same heads & intake manifolds; year to year that is. (B-bodies has cast iron heads though)
- Y-body mounted the alternator on teh driver side (F-bodies on the Passenger side with a notch in the valve cover for clearance).
- Y-body MAF tables are programed nearly identical to WS6/Firehawk Fbodies, but a little different than the standard side-elbow intake on standard trim F-bodies.
- Y-bodies and Fbodies use the same large MAF, while B-bodies get a slightly smaller one.
- Y-bodies used slightly different coolant hoses due to packaging, however the the B-bodies have a trick cop-package option with green silicon hoses. B-bodies also had optional radiators and oil coolers for a towing package.
- Y-bodies have vanity covers for the fuel rails.
- Y-bodies had 6000 rpm readlines I belive, while Fbodies had 5800 (B-bodies were 5600?). Rumor has it that the Vette PCM program can be lifted to 7200 rpms, while the Fbody and B-body can hit 7000... obviously you need the hardware and tuning to do it, but those are the limits people are reporting on the LT1_Edit mailing list.
That's all I can think of right now... but there's bound to be a few odds and ends emmissions wise (B-bodies had their AIR Pumps removed by GM in a recall and the calibration changed... Fbodies just had the pumps replaced instead, not sure about Y-bodys).
- Y and B-bodies had 2 knock sensors, F-bodies had 1.
- Y-bodies had an oil temp gauge, F-bodies do not (although the mounting boss and PCM pin/programming is there to recognize one if you want to install it).
- Y-bodies had dual exhaust, F-bodies had Y-pipe configuration that split back into dual tips/
- Y-bodies had 4-bolt mains, some 93 F-bodies and all LT4 F-bodies did as well.
- There were some very minor cam differences year to year, but this goes for B bodies as well.
- Same heads & intake manifolds; year to year that is. (B-bodies has cast iron heads though)
- Y-body mounted the alternator on teh driver side (F-bodies on the Passenger side with a notch in the valve cover for clearance).
- Y-body MAF tables are programed nearly identical to WS6/Firehawk Fbodies, but a little different than the standard side-elbow intake on standard trim F-bodies.
- Y-bodies and Fbodies use the same large MAF, while B-bodies get a slightly smaller one.
- Y-bodies used slightly different coolant hoses due to packaging, however the the B-bodies have a trick cop-package option with green silicon hoses. B-bodies also had optional radiators and oil coolers for a towing package.
- Y-bodies have vanity covers for the fuel rails.
- Y-bodies had 6000 rpm readlines I belive, while Fbodies had 5800 (B-bodies were 5600?). Rumor has it that the Vette PCM program can be lifted to 7200 rpms, while the Fbody and B-body can hit 7000... obviously you need the hardware and tuning to do it, but those are the limits people are reporting on the LT1_Edit mailing list.
That's all I can think of right now... but there's bound to be a few odds and ends emmissions wise (B-bodies had their AIR Pumps removed by GM in a recall and the calibration changed... Fbodies just had the pumps replaced instead, not sure about Y-bodys).
Last edited by Steve in Seattle; Jun 5, 2004 at 04:22 AM.
Registered User
Joined: Feb 2000
Posts: 1,445
From: Seattle, WA
Originally posted by dhirocz
fuel rails that's weird. how are they different?
oil pans (longer sump on 'Vettes) good one, forgot that one.
I think LT4's had slightly larger injectors too. That's all I can think of. yep, 28# instead of the LT1's 24# (early LT1's had 22#).
LT4's also have a different crank than LT1s.
fuel rails that's weird. how are they different?
oil pans (longer sump on 'Vettes) good one, forgot that one.
I think LT4's had slightly larger injectors too. That's all I can think of. yep, 28# instead of the LT1's 24# (early LT1's had 22#).
LT4's also have a different crank than LT1s.
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Joined: May 2004
Posts: 412
From: Toronto, Ontario
Originally posted by badblackta
Some of the first f-bodies got 4 bolt mains. I have 4 bolt main, the oil cooler line is usually a sign that you have 4-bolt main.
Some of the first f-bodies got 4 bolt mains. I have 4 bolt main, the oil cooler line is usually a sign that you have 4-bolt main.
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Joined: Jun 2001
Posts: 102
From: SF Bay Area, CA
Originally posted by Steve in Seattle
Vettes also had smaller oil filters (PF25 I thinkm, instead of F-body's PF35) but it was only packaging concerns... they're interchangeable if you have room to mount it. The Vette also had an oil cooler option that was available through SLP on Fbodies for a while. Fbody radiator is plumbed to accept it if you want to give it a try.
Vettes also had smaller oil filters (PF25 I thinkm, instead of F-body's PF35) but it was only packaging concerns... they're interchangeable if you have room to mount it. The Vette also had an oil cooler option that was available through SLP on Fbodies for a while. Fbody radiator is plumbed to accept it if you want to give it a try.
No LT1 Corvette had a factory oil cooler. GM claimed it was not needed with synthetic oil.
Redline is still 5700, though the rev limiter may be different from F-body.
Hope that helps. I think this topic comes up once a week
Registered User
Joined: May 2004
Posts: 412
From: Toronto, Ontario
Originally posted by Dan94Z28RO
Next time you do an oil change why not just pull the oil pan off and have yourself a little looksee? Or am I missing a step?
-Dan
Next time you do an oil change why not just pull the oil pan off and have yourself a little looksee? Or am I missing a step?
-Dan
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Joined: Jun 2001
Posts: 1,192
From: Hinesville, GA
Originally posted by Steve in Seattle
Vettes also had smaller oil filters (PF25 I thinkm, instead of F-body's PF35) but it was only packaging concerns... they're interchangeable if you have room to mount it. The Vette also had an oil cooler option that was available through SLP on Fbodies for a while. Fbody radiator is plumbed to accept it if you want to give it a try.
Vettes also had smaller oil filters (PF25 I thinkm, instead of F-body's PF35) but it was only packaging concerns... they're interchangeable if you have room to mount it. The Vette also had an oil cooler option that was available through SLP on Fbodies for a while. Fbody radiator is plumbed to accept it if you want to give it a try.
What kind of oil cooler are you guys referring to? My '94 has a factory oil cooler installed (oil>coolant).
What's the deal with the factory PCM being pinned for a oil temp sensor? hmmm....
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Joined: Aug 2001
Posts: 330
From: Delaware
Originally posted by badblackta
Some of the first f-bodies got 4 bolt mains. I have 4 bolt main, the oil cooler line is usually a sign that you have 4-bolt main.
4 bolt main means the main caps have 4 bolts instead of two, gives the block more strength.
Some of the first f-bodies got 4 bolt mains. I have 4 bolt main, the oil cooler line is usually a sign that you have 4-bolt main.
4 bolt main means the main caps have 4 bolts instead of two, gives the block more strength.
I have an oil cooler in my '93 
Well, that would be a nice surprice if it did.... if not, I still have a '92 vette block, waiting in my garage for some finishing
leo
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Joined: Jan 2002
Posts: 955
Originally posted by )2overt SS
Yup.. Vette has four bolt mains...
I still don't know why though can anyone explain why the Vette got a 4 bolt main and we didn't?
Yup.. Vette has four bolt mains...
I still don't know why though
can anyone explain why the Vette got a 4 bolt main and we didn't?
As we all know...the typical f-body driver is not very easy on their car, despite the fact that our particular platform is not successful in the world of motorsports like the Corvette is.
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Joined: May 2004
Posts: 28
From: Seattle
I'm with donot_4get on this one, now I'm really wondering (hey, so what if its only taken me 11 years to pay attention?)
I'll find out soon enough, having to install a new harness cuz a rat nested on the head and had fun chewing all the wires. We are doing a little more than rewiring 
Is this true???? I have an oil cooler in my '93
I have an oil cooler in my '93
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