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Username Post: Specs for 1990 454 SS engine        (Topic#207199)
Senior Member
Posts: 423
Loc: Illinois
Reg: 12-20-04
01-12-09 02:18 PM - Post#1605330    

Anyone know where I can find the specs for the 454 SS engine for 1990? I would like to know comp. ratio, cam duration/lift, head specs (valve size, chamber size) etc??



Low priced Genuine GM Auto Parts
Forum Newbie
Posts: 50

Reg: 01-01-09
01-12-09 03:29 PM - Post#1605377    
    In response to docpete Should have some info. Its a mark IV. The compression ratio is I think a low 7:1. like 7.2:1. I have a 454ss and the heads suck. The bottom end is great for boost because of the low compression ratio. I am not sure if this is true but, on other forums I have heard of guys making 600-800 rwhp on the stock bottom end with twin turbos running 20+ lbs of boost. Of course I dont think those guys are worried about longevity. I know alot of us ss guys are running superchargers and running 12's and 13's on around 7lbs of boost. My 454ss makes great power and just has a set of headers. The motor is all about torque.

Frequent Contributor
Posts: 1305
Loc: Burlington , Mass
Reg: 03-01-05
01-12-09 06:17 PM - Post#1605479    
    In response to ww454ss

I dont remeber what specs this guy has but what an awesome truck.


Forum Newbie
Posts: 50

Reg: 01-01-09
01-13-09 03:21 PM - Post#1606098    
    In response to FINMAN

Yah I love my 454ss. Its very impressive for a 19 year old truck. Mine was a little beat up and mal-nurished but it still is a beast. The first day I got it I blew the doors off a 1996 z28 and a 1968 mustang. It will chirp the tires from 2nd to 3rd. The torque is awesome.

Low priced Genuine GM Auto Parts
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