[glhs#116]

Might I also suppose that a roller cam with these factory lifters would also not need so much spring pressure because of the lighter lifters?

Sam

[Formulajones]

Yes these lifters are a little lighter so they are easier to control with spring pressures, so that is another advantage with this factory dog bone setup.

I also prefer to set up the springs with either tool steel or titanium retainers to lighten things up a bit.

Every little bit helps when you're doing engines with heavy valves, like Pontiac or BBC stuff.

Just curious what factory roller lifter would work in a Pontiac block without block or lifter modifications.

[goatwgn]

How about Pontiac 2.5 Iron Duke roller lifters?? I think I heard Mr. P Body talking about using those at one time? I am pretty sure they are the right diameter. I am not sure if the oil band height is correct though.

[242177P]

Originally Posted by goatwgn

How about Pontiac 2.5 Iron Duke roller lifters?? I think I heard Mr. P Body talking about using those at one time? I am pretty sure they are the right diameter. I am not sure if the oil band height is correct though.

If the pic on Summit's site is right, it looks like an LS type lifter?
Notch above oil band is feed hole, post #42 says it's too high.

[68hotbird]

the ht 2148 sealed power lifter works with the hr276 cam I have in my motor. I have not test fit it yet but I have an hr288 I'm going to try next. That last picture with the lifer with the oil hole above the bore looks like the ls7 lifters that I purchased. If they will grind the cam on a smaller base circle the ls7 lifters will work. One thing I will caution is that there are several manufacturers of lifters that use the same part number for small block and LS engines. They will interchange in the chevys with no issues but not the Pontiac. I also have some knock off 2148 lifters that also wont work. The only ones I know for sure right now that will work in my combo is the sealed power branded 2148 lifters. Again this is a cost savings and a reliability project but you must check everything out to verify it works. One thing I noticed that you really have to watch is I have 5 Pontiac blocks in the shop right now and there are several lifter bores that have a chamfer at the top of the bore and some do not. You have to look and measure the chamfered ones to make sure the oil hole is still covered.

[Scarebird]

I tested a full base circle roller cam I have and noted that the 60° V6 lifter does not come up far enough out of the bore to properly engage the dog bone at lowest level - only 80 thou sticks out, so I cannot use this solution.