Brain, again sucks this happened, but I'm glad and thankful it didn't do more.

The oil pump cover I had 0.020" milled off the inside of it for B, just as I had done for mine on my car, and others who wanted it done by me here locally.

For me, I have the same double roller, and run 130# springs. As Brian said we think the main problem lies with
the bevel of the crank sprocket...or lack of it on the Rollmaster.

Here is a picture of the back side of a stock L67 crank sprocket.


See how the inside has a radius machined on it, that mates up with the radius/bevel on the crank.

Brian, can you flip that Rollmaster crank sprocket over and snap a picture of the back side of it for us?

Rollmaster does not machine this radius on their sprockets, cause they are not made for our cars. So you have a flat edge trying to ramp up a bevel or a ramp in general so to say, thats on our cranks. Think of it like an wedge or an ax splitting fire wood. Same thing here. The balancer will push or try to push this crank sprocket on all the way till it stops, but because there is a wedge on the back side mating up against a flat side, its going to wedge the ID of the cranks sprocket on that wedge and its going to start trying to split the crank sprocket like fire wood.

I just dropped $300.00 odd some dollars for a new Rollmaster double roller timing chain set, new 130# Comp. springs and a new front cover gasket. (yes just one gasket) When the timing chain arrives, the crank sprocket will hit the machine shop and be set up on a rotary table to have that radius put on it. Just like the stock one. Thats what I'm going to do anyway.

But I agree 100% that R@D needs to be done NOW on this from the sellers in the US for this item. If vendors sell it as fitting, then it should with no ill effects.

They only know of the rubbing issue with the chain making contact with the front cover, and tell everyone to run two front cover gaskets cause they are against machining the oil pump cover. Well, if this radius was machined on the back side of the crank gear, then there is our lost clearance we need back...cause pretty much...with no radius there, the crank sprocket is not going on the crank all the way.

In your case it finally did...and it broke from the pressure.

My $0.02 on it anyway, and my solution to the problem for good I hope.

~F~