Quote:
Originally Posted by garyd1961
There is no way a factory vortec head is going to work with a 550 lift cam unless the bosses have been machined. I doubt it would work with a 490 lift either. Why don't you have the bosses machined down while you have them off?
|
x2
The guidance bounces around a little for Vortec heads, depending on stack up of manufacturing tolerances, but the top of the guide needs machining if you are putting in a cam. Especially a 0.550 lift cam. My eyes are as big as dinner plates right now.
If that's really the lift and those are really untouched heads I'm surprised more things were not bent at first startup. (EDIT: Oh. I just carefully read again that the PO bent a bunch of parts and blamed it on junk parts.)
CompCams and others make cheap DIY cutter tools for that if you're so inclined.