Does anybody know what's the biggest cam one can go with, without having to change from the stock push rod, rocker pivot bridge combo ?
I have a 74' 455


Thanks

 

I don't, and if you don't get a reply here you might check out realoldspower.com They have a section for engine building. A warning though, some of the ROP guys can be downright rude, so don't take it personal. I visit several car sites and the guys here are much more friendly and helpful than the other sites I've found. John

 

Thanks for the heads up.

 

I am currently running a .499 lift cam in my 4-speed car with stock ' type " rockers. I use the Elgin or Pioneer rockers that have a steel strap and individual pivots instead of the stock Alum. bridge. That way I can adjust the valvetrain somewhat using shims. I always convert to a CM pushrod with any cam change. Let me know what your engine combo is looking like, and I would be glad to make some cam suggestions.

 

Being that this is a low compression engine, I would like to go with a camshaft that produces a little more cylinder pressure. I don't want it to lope much, as this is going in a full size car. I was think of something with about 210/217 duration and about 480/490 lift. I just got thru buying a complete set of the stock aluminum pivot bridge, and I want to keep the original stock push rods. It's been years since I messed with an Oldsmobile, I use to know the answer to this question, now I'm all small block chevy

Thanks for all the help !!

 

That should be a good choice for some power and easy on the V-train. If you need to adjust the lifter pre-load, you can cut the alum pivots down on a belt sander a few thou. Just be careful not to have one side too much shorter than the other, or they will crack from the offset. Voice of experience here.