ls heads
#2
TECH Senior Member
317s are 6.0, 72cc heads, 2.00 intake 1.55 exhaust valves. Ver similar in design to the LS6 but with bigger chambers and a 4.0 bore chamber.
243s are 2 kinds, The light valved Z06 castings and the stainless valved ones, on LS2s, 5.3L etc motors. (similar castings are 799), 64.5cc, 2.00/1.55 valves.
243s are 2 kinds, The light valved Z06 castings and the stainless valved ones, on LS2s, 5.3L etc motors. (similar castings are 799), 64.5cc, 2.00/1.55 valves.
#7
TECH Senior Member
You can use them on 3.9x bore. 317s are used frequently on LS1/6 bores to lower compression for boost situations. Be aware if you use them you'll need 4.0 bore head gaskets