Gm Ported 243 Heads

[MAK567]

Item Location (City/State):HOUSTON TX

Price:1600

Description:
New in the box ls6 ported GM 243 heads from GM performance GM part#88958622

[Che70velle]

There aren't too many of these left "new in the box" on vendors shelves. I had a set of these once, and loved them.

[MAK567]

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 .

[MAK567]

Would also consider trading for some front Ridetech upper and lower control arms and Ridetech HQ single adjustable coilovers to fit a 70 Chevelle

[andrewb70]

So are these 60 or 62 cc chamber heads?

Andrew

[MAK567]

60 cc

[MAK567]

here are some pictures and spec card

[Tim john---]

What kind of performance enhancement would one see if installing these heads onto a stock 2004 GTO LS1 engine ? Is the increased compression going to be an issue, fuel octane rating, direct bolt in, everything else the same ? 2004 fuel rail covers still fit ? or would one need to find 2005/06 covers ? Etc.. PM sent, Thank You. Tim john---