roller rocker help

[CJ 613]

I recently bought a set of what I thought were new comp cams roller rockers (1.6 ratio) for my sbc 350 that I'm building. When I got them home and opened the package I noticed that the nuts had been obviously cleaned up and won't fit my studs. Can I get nuts that will fit or do I need to scrap these and get a whole new set. Also, what would be the best pushrods for my set up: 5/8 cam, 1.94 vortech heads?

[glennsexton]

Could you post a picture of what you've got? We're visual learners here!!

Regards,
Glenn

[CJ 613]

I unfortunately don't have a camera available.

[Geezer2]

If the rockers slip over the studs, but the nuts don't fit, then all you need is a set of poly locks the proper size. HOWEVER, no Chevy I know of used a bottleneck stud (Pontiac comes to mind) and there are some aftermarket 1.6 rockers for Pontiacs?????

So the question is "waddayagut?"

[CJ 613]

here's a dumb question-how do I know what size the nuts should be?

[CJ 613]

Here's another one-this is my first "high performance" build. I have a 350 bored .30 over, forged pistons, I believe the cam lift is 550 (its a 5/8 cam), holley strip dominator high rise intake with a 750dp and as I mentioned 1.94 vortech heads....with this application what is the ballpark hp I can expect? Any info would be greatly appreciated.

[Geezer2]

To "quesstimate" HP you need more imfo, compression ratio, cam lift (for sure), cam duration, intake (dual plane or single plane) just for starters.

The studs on small blocks are usually 3/8", so they would require 3/8" nuts. BUT some builders add 7/16" syuds and for these you would need 7/16" nuts. The firs thing to verify is if the rocker fit the studs properly.

Good Luck

[techinspector1]

The rockers should be stamped with the ratio. Check that first. Then see if the nut fits down in the rocker. Then see if the rocker trunnion fits the stud. You said the nut won't fit the stud. Is the nut too large or too small for the stud?

[techinspector1]

Here's another one-this is my first "high performance" build. I have a 350 bored .30 over, forged pistons, I believe the cam lift is 550 (its a 5/8 cam), holley strip dominator high rise intake with a 750dp and as I mentioned 1.94 vortech heads....with this application what is the ballpark hp I can expect? Any info would be greatly appreciated.

Here's what you need to convey to us:
Piston deck height.
Compressed gasket thickness.
Chamber volume.
Piston part number or description of the crown configuration.

If you don't know how to determine these things, ask. There is a multitude of engine builders on this board who will be happy to explain how to obtain the info.

[CJ 613]

the bottom end was built when I bought it so I don't know the technical details. Again, any info would be greatly appreciated

[CJ 613]

also, the rockers are 1.6 ratio. The nuts are too small for the studs.

[techinspector1]

They are for 3/8" studs. You have 7/16" studs in the heads. Or at least that would be my best guess.

[techinspector1]

the bottom end was built when I bought it so I don't know the technical details. Again, any info would be greatly appreciated

Have you bolted the heads to the short block yet?

[CJ 613]

no, not yet. I'm not sure if I want to run the 1.94s or not yet. I've been told that I may not get the power I'm looking for with them. I may need to go up to a 2.02.

[techinspector1]

no, not yet. I'm not sure if I want to run the 1.94s or not yet. I've been told that I may not get the power I'm looking for with them. I may need to go up to a 2.02.

What kind of power number are you looking for?

By the way, If the heads aren't on the motor yet, then you have a golden opportunity to measure the piston deck height.