I would stay with the oem rockers. Your Comp 260 supplies the lift you need. Also, roller rockers are nice when the v.cover is off, but 99% of the time you're not going to see them, but you will not notice a difference in power unless you changed to the 1.7 ratio, and you don't need it.

I should also mention that in the short time I had 1.7 rollers on, I sheered the top off two of my 3/8" screw in studs, and the keepers let loose on one of the valves, and nearly cost me an engine. One thing that is never mentioned regarding the 1.6 to 1.7 ratio change is the added amount of stress you are putting on the valve train, nor the extra amount the valve spring is compressing.

68Cabby: did you use Comp lifters? k

 

I get what you're saying. I did use the comp lifters. Is this bad?

 

I'm worried now f250 lol

 

No, nothing to worry about. A lot of guys mix parts, Comp cam, melling lifters and such. I was just curious about the combo you ended up with. I'm sure you'll get many a trouble free mile.

 

Phew haha I was initially gonna do crane lifters..but I just decided to do the comp kit

 

Will roller rocker arms fit under a stock Rocker/Valve cover? I'm reading (and would like to believe the merchandizing, but probably shouldn't) that the roller rockers "reduce valvetrain friction losses, more hp/torque, blah blah blah!"

Other than hiding them under the rocker/valve cover, would like to know if they will fit or do I need to look at a taller rocker/valve cover. The only taller alternative that I've seen is the aluminum one from Cliffords Performance. There was one posting I fofund about a guy that was going to make them (rocker/valve covers and the side/lifter cover and fuel pump opening cover) but the thread died with nothing ever resolved.

 

Yes, roller rockers will hit the oem valve cover. Clifford Performance just brought back their aluminum roller rocker cover. I believe it costs about $280. To my knowledge, it is the only higher v.cover being made.

Some guys take two of the oem covers and build one out of the two, that is is 1/2" or so higher for clearance. After welding and painting they look pretty good.

Be sure, if you change to roller rockers, to change from the oem push-in rocker studs to the stronger screw-in type, 3/8 or 7/16. I used ARP ones for a sbc, for about $50.

Good luck. k

 

I m currently researching a lot to get some roller rockers to my 1981 300. I m going with hypereutectic keith black, new oem rods, new oem valves, the head wii be port and polished and good torque camshaft (1000-4500rpm). I was told that 7/16" are stronger. My doubts:
1) Don t know which one to go for: BBC crane gold rollers 1.7 or harland sharp 1.6. I want to make my motor really reliable. My machine shop is going to make bronze valve guides.
2) what size of rockers studs (ARP) should i buy ?? My machine shop is going to tap some thread holes in it.

B) Overall stud height.
C) Screw in thread depth.
D) Adjusted thread depth.
E) Shank diameter and thread. (7/16 or 3/8)
F) Base diameter and thread. (7/16 or 3/8)
Or which arp part number.
I ve read a lot of threads but can t get rid of those doubts.
Thank you very much
Juli