oldaman

seeking cam advice . 69 cutlass 455 4spd 373 axle . p.s p.b a/c . 455 060 over small valve c heads . performer intake . headers .hei ignition running stock valve train. how big of a cam can i use and if i switch to adjustable rocker arms would it expand my choices pistons are silvolite 1630 all help appreciated .

BangScreech4-4-2

@cutlassefi is the go-to source for camshaft info (among other things) on here. I could give you an opinion but his would be the last word, so let's see if he chimes in.

cutlassefi

Anyone familiar with that Silvolite piston? Compression ratio?

Fun71

Here's what I found in a web search:

https://uempistons.com/i-17647-singl...8-1968-76.html

Silvolite Piston - 7.5L GM (V8) 1968-76
ALLOY: 332
3.031" dia. head recess .320" deep.
Comp. Ht. IN: 1.720
COMPRESSION RATIO: 8.4


The dish volume calculates to 37.8 cc but the piston is a bit shorter than factory spec.

svnt442

https://uempistons.com/i-17646-singl...8-1968-76.html

1630ALLOY:332BORE INCH:4.125BORE MM:104.8COMP. HT. IN:1.720COMPRESSION RATIO:8.4CROWN CC:+37.5ccCROWN TYPE:DISHCYLINDERS:V8ENG. DISP LITERS:7.5ENG. DISP. IN.:455ENGINE FAMILY:Oldsmobile V-8INTERCHANGE:FM 344PMFG:OldsmobileO.E. ASSEMBLY:400571, 231110OVERSIZES:STD .020 .030 .040 .060PIN CONFIG.:OffsetPIN DIA IN:.980PIN DIA MM:24.9RING SIZES:2-5/64, 1-3/16TOP LAND:.245