I seen awhile back were someone posted a topic about using valves out of a 305. Could someone give me some more info about this . What size are they? Are they a direct drop in or do you have to modify the valve or head etc?

The Chevy valves will require custom work as will any oversized valve. I would recommend the SI big valves for the /6. That's what I used on Greg Mader's head. Valves that are larger than that are too big for the ports. I've seen flow numbers for some rather big Ford and Chevy valve /6 heads and they just don't flow any more than the SI valves. The SI valves are made for our engines, which means the machining work is minimal.

Greg's head:
http://powrehaus.com/2006/12/05/old-sla ... new-power/

SI Valves:
http://www.sivalves.com/ocdomestic_valvesps_dodge.html

Mike

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You can use SBC valves in the 1.72/1.50 size. I have them in the Valaint. The valves I used have the same stem size as slant (3/8) but they are available in 5/16 as well. I used the Chev springs, retainers etc. You have to get the head machined to accept both the valves and the springs.

Caveat: the Chev valves are longer than the slants....some accomodation for this is necessary.

Is it worth it? absolutely!

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Yeah....Im the one who destroyed this rare, vintage automobile.....