combustion chamber size of stock heads on a '90?

[bradvette]

There seems to be some dicrepancy in info I'm getting. Is it 58cc on the stock D113 heads?

Also, compression ratio.....I've seen several websites that say the C/R is 9.5:1.
My GM Dealer Service Manual STD-364-90SB + the GM shop manual says the '90 corvette got the new lightweight low friction piston design, not intrerchangeable from '89 and prior, and gives a C/R of 10.25:1 for the Y-body.

This gave me a big surprise, everyone seems to perpetuate 9.5:1 for ALL L98's.
Apparently the 90 (and I assume the 91 as well) has the ratio bumped up.

This is important to confirm!

 

[Edmond]

I don't know because 10.25 is kind of high, those are current C5 like ratios.