I have these mint condition Comp Cams pro magnum 1.6 roller rockers I've been sitting on for the last 4 years. They were used for about 1000 miles. Screw in studs, hardened pushrods and guide plates too. Put them on a friends LT1 just before he had to move and couldn't take his car. He gave them to me for helping him so much with his car.

Took them off again and they sat ever since. Wanted to see that car go down the drag strip but never got to. We done loads of mods on that car.

Anyways, I was doing a stock 305 TPI rebuild and was wondering if I can incorporate the 1.6's into it somehow with the LT1 cam. Is there a spring I can buy that will work in stock configuration? I know I would have to have the stud guides tapped but I don't want to do much more with these crappy 305 heads.

Perhaps I am losing my mind. Keep the 1.6's for at least a 350.

Opinions or solid advice welcome.

 

Flame me if you like. Any answer is better than no answer.

 

No reason you can't. Just make sure you have clearance between the retainers and the valve guides.

Comp 981, or the rough equivalent Crane, Crower, Isky or Lunati 1.25" springs, would be adequate. I'd avoid "Z28" springs and any other GM ones, and K-Motion. Get them from one of the major cam mfrs.

Also, make sure you have the right combo of self-aligning rockers or not, guide plates or not, and slots in the heads or not. Only one alignment method can be used at a time.

 

That is the exact spring we used on the LT1 when we done it. They stayed along with the headers and a few other harder parts to remove.

How much clearance would you consider safe?

 

Actually just as a side note you can run self aligning rockers and guide plates at the same time if everything lines up right. There's no real reason that you would really WANT to, but you can. I ran my engine like this for a long time before I finally ditched my 1.6 rockers in favor of non-self aligning 1.7's. I had no bent pushrods, no excess wear on the guide plates or pushrods.