will they fit i'm thinking of buying them today i've been offered a good price? they are
New gm cnc'd ls6 racing cylinder heads for sale. specs are:
250cc intake
85cc exhaust
62cc cnc'd combustion chambers

these heads are assembled complete.

gm part number 88958622

General Motors posted flow numbers out of the performance catolog:

.2 .3 .4 .5 .6
I 147 215 262 290 307
E 111 155 198 210 218

 

Yes, they will fit. Compare the combustion chamber size with what you and and what you will be going with to verify if compression ratio will be affected...

Bill

 

I'm sure it will but i can retune right?

 

you can't "retune" a comp ratio. it is effected by Headd volume, piston excursion, Diston Dish or Dome, etc. someone can chime in on the 5.3L's head volume.