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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