Bobby G

iTrader: (13)

I am looking at a set of AI 243 226cc heads....the thing that stumps me is the receipt says milled .030 for a 65cc chamber.....thought 243 heads were 64cc? Would I start to have PTV problems with my EPS 226/234 .598/.601 cam at that point? This is for a LQ4 I have

99Bluz28

iTrader: (35)

I go a head an contact AI for the most accurate explanation.

FAD2BLK93

X2 ^^^^^^^.... Then cc them yourself to be accurate

redtan

iTrader: (5)

They are either 317 heads and someone mistook them for 243s, or they are 243 heads and someone mistook them for 317.

What do the casting marks say on them?

SWEET98SS

iTrader: (8)

My casting mark say my initials. See what those say.

KCS

iTrader: (20)

A lot of times the valve job will make the chambers bigger. My 241's ended up at 69cc after the valve job and blending.

mrgwrnch

Just CC'd my 799's and measured 67 CC's. I believe they have the same size combustion chambers?

badazz81z28

iTrader: (6)

Yup,

Actually, Phil's work advertised the ability to raise the compression etc with little milling by the work done in the chamber. The heads could have had the valves sucked back for PTV clearence and the chambers could have been cleaned up. I would trust what they say on them, but I would also check PTV clearance anyways.