Thread: 505 build up

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What are the casting numbers on your heads? If they are the stock heads on a tall deck truck block, they are not going to be the best heads for performance use. Also, what is the intended use of this engine? You dont need hardened seats at all unless this is going to be a daily driver. You'll never see the deterioration unless you're going to drive this thing about 30K miles. And if you get a good GM hei distributor (not one of the aftermarket ones from China), it will be fine for 6K. Lots of my friends are running them in a drag/street car, and they are just a stock HEI....no break up at 6500 RPMs going thru the traps. Post the numbers on those heads. John

Hi, the casting numbers on these heads are 343772. They are large oval port open chamber heads with 2.06/1.72 valves. I want to replace these valves with 2.19/1.88 valves. This engine will go into a vehicle that at most will be driven twice a week on the street and an occasional 1/4 mile run, but I intend for them to be very hard miles on the street. As for the issue of the hei distributor and the tall deck block, i have a weiland team g tall deck oval port intake that i plan on using which will allow me to use a standard height distributor.