WTB ported 5.3 or 243 heads
11-13-2013, 08:58 AM
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heads gm has lingfelter performance cnc their heads.Here is a discussion about them.
Hi, we actually do the CNC work on those heads for GM, let me give you some info:
the heads are made in 2 versions, a 60cc and a 62cc chamber. The 60cc chamber will give you about 11.3:1 compression on a stock bottom end.
Flow numbers:
Int. Exh.
200 150 117
300 225 168
400 273 202
450 285 210
500 291 217
550 304 221
600 311 222
They still use the LS6 sodium filled valves, stock size, and LS6 valvesprings. The 60cc versions have been milled approx. .055" to achieve this chamber size, so you will have to notch the 4 corner bolt recesses to make your intake fit, but it's no big deal. Over all, a very good set of heads for the price considering your getting new, genuine GM LS6 heads, CNC ported for about $1900.00 outright.
Hi, we actually do the CNC work on those heads for GM, let me give you some info:
the heads are made in 2 versions, a 60cc and a 62cc chamber. The 60cc chamber will give you about 11.3:1 compression on a stock bottom end.
Flow numbers:
Int. Exh.
200 150 117
300 225 168
400 273 202
450 285 210
500 291 217
550 304 221
600 311 222
They still use the LS6 sodium filled valves, stock size, and LS6 valvesprings. The 60cc versions have been milled approx. .055" to achieve this chamber size, so you will have to notch the 4 corner bolt recesses to make your intake fit, but it's no big deal. Over all, a very good set of heads for the price considering your getting new, genuine GM LS6 heads, CNC ported for about $1900.00 outright.