So, that is a lot of contact. Not positive as to why.
That said, yes , from now on comp 910 springs are required. Shim to 1.800 installed height is what I do.
The reason is that with boost and high miles old ,weak, stock springs are causing contact on STOCK engines. I just looked at one tuesday. Only for sure is that the springs are weak.
Valve recession needs to be closer to the deep side if at all possible.
High oil pressure when cold with excess rpm will cause contact.
When you get it together if its too close retard the cam 1 tooth, that will open up clearances, doesnt hurt cam performance.
IP gear gets timed to crank. I am getting a procedure to post with all purchases.
I also have a new grind that will help, it is a little less duration to make the event later after TDC.
thanks for the reply.
with what you said, I will get a set of the comp springs. what direction do I turn the cam to retard it? would i use clay on the piston to check for clearance?