Erikthegoalie

Like the title says, my Dad and I were thinking about retro-fitting his 440HP RB motor out of his 67 GTX from flat tappet to full roller cam and lifters...

I also know that you need a cam retainer of some sort with a roller cam and lifters as opposed to flat tappet cams and their tapered lobes...

Anyone know of or have something like this in their b body 440?

THANKS!
Erik

Erikthegoalie

?? no?

67 GTX

i know that there are several manufacturers for the roller cams
look in summit, they have loads of them

Erikthegoalie

Sup bossman!
You are correct, but I think those are for the "3 bolt" style camshafts, not the one bolt style like my cam has in my 67 440...

any thoughts?

67 GTX

just curious, why do you wanna go the roller cam way?


im don't have too much experiences with them.

BuckNeccid

3 bolt cam, one bolt cam, interchangeable.... you just have to use the correct timing gear for that cam.

Jarettb

More lift without having to increase the duration which hurts idle and manifold pressure. Typically with a more "radical" cam you have to increase the duration to compensate for a significant amount of lift becasue the leading edge of the tappet will scrape up the cam lobe rather than smoothly slide across the surface of the cam lobe. Conversally the valve springs need to be stiffer because the increase ramp speed of the valve of the steeper cam lobe. Lighter valves helps in this as well.

Summit Racing is where I got mine too.

Erikthegoalie

aside from the actual timing chain and sproket, what keeps the cam from walking right out of the block?
Isn't there a cam retainer plate on the 3 bolt cam motors?

I heard the cam lobes themselves keep a cam centered on the 1 bolt style cams...

any thoughts?

67 GTX

not sure
i think i had the one bolt

Commando

I got the one bolt as well, and I have never really thought about it. I would guess that the pressure from the sprocket, and lifters keeps it in place.

mmzullo

Hydraulic cams are made to keep the trust of the cam in the block. A roller cam does not have this feature of tappered grind to keep the cam in the block. You will need a thrush set up on a roller cam. It's been so long messing with cams. I had Crane Cam custom make cams for my big block Dart. Those where the good old days.