Difference between 70 71 72 ?
Drifting
Joined: Sep 1999
Posts: 1,970
Likes: 91
A few to add.....
Console change for 71
fire wall vacuum metal tubes for 71
wiper door vacuum valve moved after 70.
washer bottle change after 70
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,114
From: Crossville TN
There were several 'cosmetic' changes in that 3-model year period...some have been mentioned; some not. The substantive stuff is that the '70 vette engines had the most potent performance of any vettes made [until recently, of course]. Those same [engine block size] engines were derated via compression ratio and cam changes in '71 and '72. In essence, there is no real difference between '71 and '72 engines other than the published engine power figures. The differences were merely due to rating method differences (SAE net vs. SAE gross). The 'detail' men/women will now tell you the minute differences between those '71 and '72 engines... 
just ignore them for this discussion, however.
just ignore them for this discussion, however.
Drifting
Joined: Sep 2006
Posts: 1,259
Likes: 2
From: MS
1972 last year for vacuum operated wiper door.
1972 last year for solid aluminum body mounts, 73-up is rubber.
1972 last year for nylon cord bias ply tires, 73-up tires are radials.
1972 was the first year for a smog pump on the LS5.
1972 was the first year that any Corvette engine could not be sold in Calif (LS5).
1972 was the first year since 1956 that you could not get a 4.56 axle on a Corvette.
From 70-72, the 4.56 was available on the ZR1 only, but was dropped for 72.
The lowest axle ratio after 71 now became the 4.11.
1972 was the last year that you could get a 3.70 axle on a big block,
after 72 the 3.55 would be the lowest available with a big block.
72 was also the last year of the restriction against the big block/M21/AC combination,
for 73 you could now get the LS4/M21/AC, for 69-72 M21 required a no AC car.
1972 last year for solid aluminum body mounts, 73-up is rubber.
1972 last year for nylon cord bias ply tires, 73-up tires are radials.
1972 was the first year for a smog pump on the LS5.
1972 was the first year that any Corvette engine could not be sold in Calif (LS5).
1972 was the first year since 1956 that you could not get a 4.56 axle on a Corvette.
From 70-72, the 4.56 was available on the ZR1 only, but was dropped for 72.
The lowest axle ratio after 71 now became the 4.11.
1972 was the last year that you could get a 3.70 axle on a big block,
after 72 the 3.55 would be the lowest available with a big block.
72 was also the last year of the restriction against the big block/M21/AC combination,
for 73 you could now get the LS4/M21/AC, for 69-72 M21 required a no AC car.
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with you ... thanks for correcting my error. Just another 'Senior Moment' for me.
Advanced
Joined: Jan 2007
Posts: 96
Likes: 0
From: Sandnes Norway
Pro
Joined: May 2006
Posts: 567
Likes: 115
From: Long Island NY/ Cape Coral FL
Reverse light lens's , gauge lettering, shoulder harness access holes in seat backs , opitic fibres, radio *****, removable rear window., parking lenses. These are the easy eye ones.
Burning Brakes
Joined: Feb 2008
Posts: 1,042
Likes: 19
From: Oswego New York
I just looked at ondagawood's '72 project yesterday, and noticed that it has front seat belt retractors under the carpeting, whereas my '70 doesn't have them, but does have chrome holding clips attached to each seat to hold the lap belts neatly in place.
How about the '71 configuration?
How about the '71 configuration?
Le Mans Master
Joined: Jun 2006
Posts: 6,397
Likes: 1,226
From: Tampa Florida
