c90E head/valve ?

[6cougar8]

I recently got a set of 351w heads stamped C90E. What is the chamber size on thes? They are the machine shop getting 1.6 exhaust valves installed and was wondering if later on I decide to machine the heads for screw in studs and then use a roller rocker will I still be able to use the valves that have the longer tip on them or will I have to switch over to a chevy or late model ford valve?

I'm planning on using a b303 cam (its a roller 351) 224 dur and .480 lift would the stock 69 springs hold up or will I have toget different springs? Or could I swap a set of springs off of my 40p heads I have and use those on the 69 heads?

Thanks to all that reply.

 

[bnickel]

the chambers should be 60cc provided the heads haven't been milled. the valves should be ok, but i'm not 100% sure on that. as for the springs i would recommend getting springs that match the cam, the stock 69 springs would most likely not be compatible with the roller cam, since the rollers require more seat pressure to keep them from bouncing off the cam and they are heavier too. the springs from the P heads would probably work since they were originally used in roller applications, but i'd still recommend new ones.

 

[6cougar8]

Thanks. The springs from the p heads have about 2k miles on them, so they should be good until I get the dough to machine the heads for screw studs and double valve springs.

 

[D.Hearne]

What rocker you will be able to use will depend on the geometry, after you've installed the screw in studs. You may need a Ford spec rocker, or small block Chevy spec'd one's. You won't need to change the valves, just the rockers and pushrods.