Mopar R1 block

SwedishViking said
This is a new build with a new R block, i will bee doing bracket racing only so its a drag car.
I belive that the comp will get to about 13.5
The heads are not done yet, bought them of ebay and now they are being redone the plastic.
I am considering to have the lifte bores sleeved or not to do it. Calculating the cost vs horsepower gain would be my issue.

Mushroom lifters what is that? Do you still have to block of the oil to the lifters?

A mushroom lifter has a .904 body and IIRC a 1.000 or 1.050 base on it. So it acts like you have a larger than .904 lifter.

I always block off the oil to the lifters with a tube or bushings. If you are going to run a SFT cam, the bushings probably won't do anything power wise.

If you are going to run a real agressive roller lifter, you may want to bush the lifters to make sure there are all on the same plane and axes.