Set of two complete 356 aluminium t6 heat treated 3 23 degree head 64 cc chamber 200 cc intake runner 70 cc exhaust runner 2.02 intake valves 1.60 exhaust valves bronze 11/32 valve guides takes .532 seals 7/16 studs 5/16 guide plates hardened valve seats improved combustion chamber shape for faster burn weight 13 kilo approx each head
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