XR7 Dave said:
No offense to your machinist, but that is a question that can only be answered by him. It depends on your cam's base circle, your pushrod length, how much both the block and heads have been decked, rocker arm manufacturer and the tip height of your valve. Obviously all of those things are open to variations so only the installer can answer those that question with anything that resembles accuracy.
Well he did the vlavejob without re-assembly, because I had too pick them back up to apply the TBC coating to the CCs and ex ports.
He did not assemble the heads yet, but it looked like the ex valves stems were a little taller than the intakes. He just asked me if I had adjustabe rockers or if I was gonna use the stockers, and said I might need to shim them...
I was just wondering if others have had to do this.
As for the cam base circle, does this get changed on a regrind? I got the catwithboost cam, and the card don't have that info on it... Should it be all that differnt?
ANywyas, I am paying them to setup the heads, but now that I think about it, would this only include shimming the springs for the correct hight?
If so, would I have to reassemble everything, then take it back for the rockers to be adjuted/shimmed? Or should he be able to mathematically calculate this? Or is this somethig that should be figured out by me?
I was planning on putting these heads and cam on my currect motor till I get everythng tuned up, etc, etc... So should I get some kind of adjustable pushrod to find out what length I need? It's likely that I will need two different sets of pushrodds for the old and new motors, since the old block hasn't been decked...
How would I get a rough estimate for pushrod length, or wether I need to shim up the rocker arms? Wouldn't the engine have to be oiled up (or lifters soaked overnight) to do this anywyas?
I'm confused