I had some Trick Flow Aluminum roller rockers (TFS-51400511) going bad so I am replacing them all with new Comp Cams CCA-1834-16 PRO MAG steel rockers. They are both 1.7 ratio (7/16" stud mount) but the current push rod lengths (8.330") are too short for the new rockers (need 8.450"). Is this normal going from an aluminum rocker to the new steel type rockers and have to change push rods lengths?

Tim

My opinion is that it's pretty normal to change rockers or lifters between brands and have to get new pushrods if you want the geometry to be right or the adjuster on shafts to have the right amount of engagement. I went from on type of Morel lifter to another type of Morel and needed new pushrods.

Went from stud mount rockers to shaft rockers. Needed new pushrods. I think I have 5 different sets I have bought through the years. LOL

Curtis

Yes, it's absolutely "normal". Not like the old days when about all the OEM performance parts were interchangeable because they were made by the same outfit. But those days are long gone and there isn't any universality among aftermarket manufactures.

I cant speak for all aluminum rockers, but the set I just took off and replaced with a set of steel cca magnums were so thick that the hex on the poly lock was digging into the aluminum to the point I had a hard time getting a wrench on them. With the steel rockers I gained a whole bunch of stud.Point is, I was thinking I would have to go to a shorter push rod because of the thickness of the aluminum rockers, or a longer stud, if there is such a thing.

Thanks for the information. I sent Comp Cams a email about it but have not gotten a response back yet. I guess their Tech Department is on vacation?

Tim

If you have any offset in your rocker arms, don’t even bother to buy aluminum rockers. They have an offset for a reason. There is a lot of side load and eventually the threads in the body of the rocker will blow out. Often you can buy a half set of rockers (offset) in steel and the other half (non-offset) in aluminum.

quote:

...or a longer stud, if there is such a thing.

Yes they are definitely out there. When I installed SS rockers the poly-locks were much longer and the trunnions were thicker and wasn't engaging the stud enough to suit me, and I was concerned about stud flex (even with a stud girdle) just engaging the top portion. I had to scrounge through OEM manufacturers catalogs to find what I wanted.

You should never use aluminum. They flex all over the place. Try a set of Manton’s and be done

quote:

Originally posted by I.P. Dailey:
You should never use aluminum. They flex all over the place. Try a set of Manton’s and be done

They make those for Ford?

quote:

Originally posted by I.P. Dailey:
You should never use aluminum. They flex all over the place. Try a set of Manton’s and be done

Somebody needs to tell Jesel and T&D about this problem, they'll need to do some massive recalls and retool everything.

Curtis, I believe they or maybe crower.

Busted, never said they couldn’t build I just said the flex. Your choice