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Join Date: Aug 2006
Location: North Baltimore, Oh
Re: AFR 305 rebuild & port... Who?
If you haven't already, make sure that you mill crankcase vent holes.
I have 5,000 miles on my angle milled and chamber worked 305's; and when I had them re-done, 4 valves had to be replaced. The valves weren't bent but almost like they were dimpled in the seat area. There was also flaked aluminum in the seats. I don't know where the aluminum came from. I did open up the valve reliefs in the pistons, but I can't imagine how that aluminum could have gotten into the valve seats. He also smoothed the ports, and he said that there was some very rough edges in those ports. All this to say, you should have aftermarket heads checked and/or reworked before installing.
'69 Chevelle SS ("NOT" ON THE ROAD NOW!
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Engine parts: (Heads, cam & lifters from Lewis Racing Engines)
ZZ502 Short block
AFR 305 CNC 106cc Chambers 8002 springs
Bullet HR ADV Dur 295/297 238/242 @ .050 .680/.650-110 LSA-108 ICL Morel lifters
Holley Avenger MPFI
T-56 Magnum trans with hydraulic McLeod RST