edman87k5

iTrader: (3)

I have a 91 rs, 305 tbi, 5 speed. Is this a roller cam motor or not?
Also, does anyone know the factory cam specs for this motor?

sofakingdom

iTrader: (1)

Should be.

You don't want to know. If you have to ask, you need another one.

DartByU

If it's stock then yes it's a roller cam, and I think it's the smallest cam GM ever put in a V8 engine.

edman87k5

iTrader: (3)

Ok, it looks like roller cam it is.
The reason I asked is I have the shortblock from my 86 and was thinking of building it for the 91rs, but the 86 is non roller and the cam is gone. The 86 has no ridge in the cyls, but cam bearings look kinda bad to me. The 91 has a lot of miles, runs good, but is starting to use some oil and I was planning on a rebuild this summer.
I guess I will just pull the 91 and build it back to stock.

Kevin91Z

iTrader: (1)

Cam specs are in the tech data section of the main page of this website. I think its something like 179/193, and .370/.390 lift.
When you rebuild the 91, you can use any 87-97 TPI or LT1 camshaft. They are better than the TBI cam and will work with the stock computer, giving you a good increase in power.

DartByU

Even worse than that, it took some diggin to find but it's actually
.350/.384 lift and 179/194 duration 109 centerline

edman87k5

iTrader: (3)

Thanks for the info, I couldn't find it.