[chiphead]

That roller looks like a real possibility for this application. What comp lobes does it use? Looks like a decent amount of seat timing, slower than a XE lobe?

What springs and retainers would be needed? Would this set up at 1.6" or would you need longer valves? When I set up the Voodoo HR on my 670s, I had to go to 1.8" to find a spring that would set up at the correct pressures with enough lift.

[Jay S]

Originally Posted by chiphead

That roller looks like a real possibility for this application. What comp lobes does it use? Looks like a decent amount of seat timing, slower than a XE lobe?

What springs and retainers would be needed? Would this set up at 1.6" or would you need longer valves? When I set up the Voodoo HR on my 670s, I had to go to 1.8" to find a spring that would set up at the correct pressures with enough lift.

That cam does not have profiles list anywhere that I know of. It definetly has less acceleration than a XR Comp hydrualic roller profile. It would be difficult to compare it to a XE flat tappet. But if the install height was set in a stockish range of 1.6 to 1.63 the Bulter cam would work with the same 995 spring and 940 retainer combination comp uses on most of the XE flat tappets cams. It is a very easy spring package to put together.

For what was described I would prefer to use a Bullet or Howard’s HR cam that allows for the use of a stock distributer gear. They are all 4/7 swaps. Those lower lifts work well for the 2148 LS/LT drop in style dog bone lifters too.


I am not sure where the compression would end up on a 67 engine with heads mentioned. Seems like those had an odd piston with smaller valve reliefs like an 389 and have different cylinder scallops. But I would assume a 62 head with a valve job and surfaced would be at least 75 cc to 77cc.

[1967catalina]

I would be open to a flat tappet knowing a good lifter to use. I have been out of the engine world for about 12 years lots of things have changed. This is my first pontiac project.

I figured I would be about 10.1 with those heads. I'm just looking bump this 265hp 2bbl engine up a little and have a fun car, tri power, 4 speed. I don't really car or expect it to be a track monster, that's not my goal. I will check out the pistons when I get the heads off. That will be awhile from now, I'm researching my options and wanting to have a good smaller cam, lifter, spring combination picked out for when it's time. It sounds like the 068 cam is a good option.

Note taken on the ram air 4 being to big. Tha k you for that information.

[geeteeohguy]

Originally Posted by 1967catalina

I would be open to a flat tappet knowing a good lifter to use. I have been out of the engine world for about 12 years lots of things have changed. This is my first pontiac project.

I figured I would be about 10.1 with those heads. I'm just looking bump this 265hp 2bbl engine up a little and have a fun car, tri power, 4 speed. I don't really car or expect it to be a track monster, that's not my goal. I will check out the pistons when I get the heads off. That will be awhile from now, I'm researching my options and wanting to have a good smaller cam, lifter, spring combination picked out for when it's time. It sounds like the 068 cam is a good option.

Note taken on the ram air 4 being to big. Tha k you for that information.

I've always had stock-ish type Pontiac builds over the decades and never liked the Ram Air cams for my purposes, which was daily driver and road trips. I like a cam like the 068 because it gives usable power in the rpm range the engine is in most of the time and is good on gas as well. With an 068, I can run a lazier rear gear for less road rpm and less wear and tear, which gives me guiet cruising and high MPG's. Ram air cams want a stiff rear and gear and make power at high rpms. Great on the track, but for me on the street, not my bag. This '67 with an o68 cam, TH400, original 400 engine, Q-jet, points distributor and swapped in 2.56 rear end averaged 20.6 MPG on a 2700 mile cross country trip in 2023. Car has 260,000 miles on it, engine was rebuilt 90,000 miles ago.

[1967catalina]

Thank you for the info, and that is awesome!

Originally Posted by geeteeohguy

I've always had stock-ish type Pontiac builds over the decades and never liked the Ram Air cams for my purposes, which was daily driver and road trips. I like a cam like the 068 because it gives usable power in the rpm range the engine is in most of the time and is good on gas as well. With an 068, I can run a lazier rear gear for less road rpm and less wear and tear, which gives me guiet cruising and high MPG's. Ram air cams want a stiff rear and gear and make power at high rpms. Great on the track, but for me on the street, not my bag. This '67 with an o68 cam, TH400, original 400 engine, Q-jet, points distributor and swapped in 2.56 rear end averaged 20.6 MPG on a 2700 mile cross country trip in 2023. Car has 260,000 miles on it, engine was rebuilt 90,000 miles ago. Attachment 660262