Late model pressure plate differences

[2manyvairs2fix]

I had a standard and heavy duty pressure plate side by side today for a comparison.
My question is: With the exception of the contact ring weights on the heavy duty plate,
are there other differences such as static spring pressure or metal thickness between the two?

[bbodie52]

According to the 1965 Corvair Chassis Shop Manual specifications and the 1966 Corvair GM Heritage Center Specifications the disc friction surface area, pressure plate spring pressure, and pressure plate material are all different when comparing the standard (10100-500/10500-Monza) clutch assembly and the heavy duty (10700-Corsa) clutch assembly. The flywheels were all the same.

Interesting that the clutch specifications table published in the 1965 shop manual was apparently written for the 1964 shop manual supplement, and shows specs for the 95 hp, 110 hp, and 150 hp engines. It was not updated by GM to reflect the 1965 model year engine specifications of 95 hp, 110 hp, 140 hp, and 180 hp!

1965 Corvair Chassis Shop Manual - SECTION - SPECIFICATIONS.pdf

1965 Corvair Chassis Shop Manual - SECTION - SPECIFICATIONS

(2.83 MiB) Downloaded 24 times

LM Clutch Specs (1965 Corvair Chassis Shop Manual)

1966-Chevrolet-Corvair - GM Heritage Center Specs.pdf

1966-Chevrolet-Corvair - GM Heritage Center Specs

(1.78 MiB) Downloaded 19 times

LM Clutch Specs (1966 Corvair - GM Heritage Center)

[2manyvairs2fix]

Thank you Brad.
Chilton's doesn't cover that.
I guess it's time for a chassis manual.

[bbodie52]

All of these shop manuals and many other useful technical resources can be downloaded at no cost in Adobe Reader (.pdf) format using websites listed at the following link...

Common and Useful Corvair Websites

Corvair Forum viewtopic.php?f=225&t=6007

Norm Witte posted links to the GM Heritage Center on the Corvair Forum for downloading the GM Heritage Center Corvair specifications for all model years. You can download them using the following link...

Corvair Forum viewtopic.php?f=51&t=4321&p=30113&hilit ... hes#p30113