68 Riv, 455 performance?

What kind of performance can I expect from my 68 Riviera with a 70 455 4BBL?

Except from the engine the car is stock.

Just want to know if I'm getting there in regards to tuning etc.

Per.

:beer

 

I'd expect low 15s to high 14s. Am I close?

 

Thanks Gary.

I'll check it out in the week-end, and let you know.

Per. :beer

 

When i swapped a fresh Stage1 455 with a 118 cam for my stock 400, I expected alot more increase than i got. I went from 15.80 to 14. 80

Then I talked to a few people in "the Know" and they said the stock exhaust was tying up alot of power

With headers and 2.5" exhaust and UltraFlow mufflers I gained alomst a full second !!!!

 

I have a 73 riv with a mild stage one with a 113 cam and a 2800 stall. It did a 13.88 with the 2:92 gear still in it(got a 3:42 now, can't wait to try again).

 

High 14's with a 3.42 gear. With the 3.07 you're lookin' at 15.2@90 mph or so.

 

Thanks for all the replies.

Tested it out last night. Got in on 16 & something. (Roughly measured highway track).

Then for the third time, I blew one of the manifold gasket. ou:

Had the old 2" exhaust replaced with a new of same size when I got the car 6 mnts ago. (Have since had both manifolds machined and straightened).
I expect the 2" pipes and the mufflers are too small, thereby building up too much back pressure at WOT.

What's the original exhaust pipe size for a 1970 455 4BBL?

Per.

:beer