I received my new cam and lifters yesterday, RB engine, the lifter on the right is what came with it. I've never used any like these, what's the point of the reduced o.d.? 87 grams, 122 grams and 100 grams respectively.

Hey Mike what brand are those,they look like slant six lifters to me.

Randy, I don't remember the name of manufacturer, they came in a Bullet Racing Cams box. The light one on the left is Mopar Perf., the middle one Comp. I was surprised of the difference in weight, and that the full bodied Mopar unit was lighter that the one from Bullet.

The MP solid lifter is the lightest two piece (hollow) I have measured.

Yes, the MP lifter is hollow inside. If you remove the clip, then the pushrod seat, you will see the space underneath.

Mike,
Can you make some measurements of the barbell shaped lifter? If you don't have a dial caliper, just to the 1/16" inch would still be informative.

Jim, I have a dial caliper and will measure it when I get home, about 5 p.m. Are there any drawbacks to this design?

Are you aware that if you use the barbell design w/o bushed lifter bores, you will have NO oil pressure due to excessive oil getting past the cutout in the lifter body?

Brad, That is what I was wondering, that's why I asked. Thanks. I guess these need to go back. Thanks.

Jim, Here are the dimensions of the lifter. What's it designed for? Thanks for all replies.

if the top[.590]part doesn't come out of the lifter bore it shouldn't lose pressure,right.

If the top part does come out of the hole theres going to be some serious stabilty issues.

The barbell part is at the oil feed, but it will just fill and oil the bore more evenly. I dont see how it will lose all oil psi. Its going to fill and only leak out around the perimeter of the lifters bore. Its not going to Dump into a unpressurized opening.

Personally I dont like that new design. I like the full body better, but I guess the barbell could work just as well. But , your going to have to add the extra grams of excess oil of the filled part of the barbell handle to the overall lifters weight thats going to be pushed around.

The benefits if any is the full 360* lifter bore oiling vs just the regular side bore feed oiling. There may be some more slight oil leakage with loose bores but thats dousing the cam mostly. Maybe a poormans EDM lifter.

We run mopars also they are lighter and been told 5 thousand under size. Comps are heavy .
But I had a mishap last year with one ,nobody has seen this happen .
We believe the lashcap broke and caused too much lash ,or the hole in lifter made too much lash broke lashcap .
witch came 1st chicken or egg.

Pic of it

I had about 8 mopar performace lifters do that over 3 ton 4 years! I used to carry spares and spare pushrods for road side fixes. then I heard some friends had the same failours with mopar performance lifters. bought Comp Cams lifters and never had another problem???

Mike, for comparison
this is info I have for the Howards EDM face oiling lifters. They are overall slightly taller than the MP lifters, with an oil band that didn't give me any issues with 0.650" lift. Two sources had some variation in the numbers, but FWIW.

And this is some other notes I have saved.

Here is the best I can ESTIMATE, from this info. You better check if the barbell lifter cut out gets exposed at the bottom of the lifter bore when the cam is on the base circle (zero lift). It looks close. I don't have a dimension for that. The purple lines are approximately what I saw with my Howards lifters and a 0.650" lift cam (0.433 tappet lift).

Jim...it always amazes me how much info you compile.