I am about to try to port my intake to match my champion heads.
I was wondering if anyone could reccomend the best type of grinding point compound, or should I use carbide?
Also, when I went to make a template of the heads, I noticed that there is 1/8" of slop in the bolts between the heads and the intake (the holes in the intake are bigger than the threaded holes in the heads) I am using ARP bolts, don't remember if the stock intake bolts were flanged or anything, but I don't think so. Were they? Anyone else notice this and if so, how did you solve it?
Rick Chadwick
I used a carbide bit with "grinder's grease" (basically a waxy stuff with some sort of lubricant embedded in it..) You dip the bit in it periodically and it keeps the soft aluminum from balling up in the bit.
As far as the intake bolts, they aren't really anything special...
I have been porting aluminum heads and intakes for many years and have found dipping the bits in motor oil once in a while free them of any aluminum clogging. Cheap and simple.
Also, when porting the intake keep in mind that this intake injector fuel flow is directed at the center of the valve. Cutting in this area does require a certain amount of care as you do not want to lose the fuel from the air stream.
Note: From past experience, I have had heads ported by many different persons and they did not always flow the numbers advertised. Consider taking one head to a local shop and have one intake and one exhaust valve bench flowed for verification. This is regardless of who ported the heads.