pro action heads

btcampbell · #1 (**permalink**) 03-13-2010, 06:36 PM

just got a car with a chevy smallblock 383. I was told the heads are rhs pro action, number on front of head is 1234600020a B 1790 CAN ANY one give me info on these thanks

amick · #2 (**permalink**) 03-15-2010, 10:58 AM

I think you put one to many zeros in that number. If so then those are 23 degree SBC aluninum, 220cc runner, 64cc chamber, angle plug head with CNC chambers but as cast ports.

btcampbell · #3 (**permalink**) 03-15-2010, 07:16 PM

Thank you very much. what size are the valves? What spark plug do you recommend, and thanks again.

amick · #4 (**permalink**) 03-16-2010, 10:47 AM

Those heads had 2.02/1.60 vavlves. As far as a spark plug goes it takes a gasket seat, 14mm, 5/8 hex, .750 reach plug.