valve grinding specs on a 455

[Guest]

Thanks for all the help with the last post. well I have found that alot of this engine (1970 455) needed an overhaul, but now we are redoing the heads and I cant find what the valve and seat angle specs are. I think they should be

valve....46 degrees

seat.....45 degrees

is this correct. thank you for your time

Dwayne

[rocketraider]

Those are the numbers the 1970 service manual gives for both intake and exhaust valves, using the standard 2.00" intake valves. 442 and Toronado with 2.07" intake valves use 30 degree intake valve and seat angles.

Valve seat width spec is .037" to .075" for 2.00 intakes and all exhaust, .030"-.045" with 2.07 intakes.

Have your machinist do a 3-angle valve job using hardened valve seat inserts. You'll pick up a little extra efficiency and performance and the engine will be set up to use unleaded fuel. Make sure he uses the ones for Olds engines- sometimes they'll try to put Chevy seats in and end up cutting into the water jacket- meaning an instant junk head.