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View Full Version : Cylinder Head Interchangeability


Backtanner
10-04-2005, 07:01 AM
I need a set of replacement heads for what I was always led to believe was an LS6 motor. The casting number on what I am replacing is 6272990 which, depending on which site I go to, is either an LS6 or LS7. I might have a line on replacements but the casting number on them is 14096188. From what I come up with, I am about 90% sure these will work but wanted to 2X check before I pull the trigger.
cstraub
10-04-2005, 07:46 AM
Yes, the 188 are factory replacements for the 990's.
Chris
SmokinLowriderSS
10-04-2005, 03:03 PM
According to Mortec... both are rectangular port, open chamber heads. The 990's show a 118cc chamber volume, the 188's show a 116cc chamber, basically identical. A few fragments of an increase in compression from the 188's but not enough to get excited about I think, unless you are on the ragged edge of compression tolerance already.
GofastRacer
10-04-2005, 07:56 PM
The new factory "990" repalcement is 6260482 $379.95 each from SDPC!..
Backtanner
10-13-2005, 04:39 PM
What's the diff between the 088s and the 188s? And/or are they interchangeable?
victorfb
10-13-2005, 07:57 PM
the 088s are genV heads. not recommended to use on mark IV blocks.
EXTREMEBOATS
10-14-2005, 03:20 AM
Bite the bulit and buy a set of Merlin heads. Out of the box they not only make more power but by the time you build factory heads you have stepted backwards... I have several factory heads waisting space because of the options offered by after market dealers... NO SALES PITCH, just comen sence...
Mike