Thanks I'll give them a call. I am a green horn on motors, vehicle motors, I am an A&P and I build turbine engines for a living our free turbine turns 75,000 RPM and we have a tol. of .005 of a mm (five microns) on our parts, anyway the only reason I am rebuilding my 350 four bolt is that it is a four bolt main, for the extra strenght. I just had to let you Know that I am not a complete idiot, I guess I should have put, I have some ? about my cam, in my 350 four bolt. I am queit sure I did not draw that line and write the message under there the first time and positive I didnt write it the second time. Dont Know way it keeps showing up