The Stovebolt Site Forums The Shop Area The HiPo Shop V-6 ,84 chassis, Info required.

Sorry i took so long to reply...I only get on this forum sometimes. I found this on SyTy.net. I hope this helps you with those casting #s....

"Note the following about 4.3 heads: I have determined that the '92 & '93 CPI head (L35 type) have four possible casting nos. available #10238181, 10077626, 14099064, & 10240209
that all have an 8 degree top angle cut in the ports and screw-in rocker studs, with the top of the ports having a small circular cutout for the injector holes in the intake manifold. The
'88-'92 TBI engines (LB4 type) have head casting #10144103 which is the older style TBI head that has an intake port that is rectangular in shape with no circular cutout on the top of
the port & a highly restricted intake throat compared to the CPI style head . The '93 TBI engine (also LB4 code) has the same four possible casting nos. available as the '92-'93 CPI
engines that all have an 8 degree top angle cut in the ports with the top of the ports having a small circular cutout just like the CPI heads, but they have press-in rocker studs rather
than screw-in rocker studs. The use of these CPI style heads on the '93 up TBI engines is why the HP rating of this engine was raised from 160 HP to 165 HP. The '92 TBI head is
not the same as the '92 CPI head as detailed above, and there may be a few early '93 model TBI engines that were carry overs from the '92 model year that still have the old style '92
back TBI heads as well. The '94-'95 CPI head (still an L35 code) has only two possible casting nos. available #10238181 & 10240209 that has a 30 degree top angle cut in the ports
and screw-in rocker studs, with the top of the ports having a small circular cutout. The '94-'95 TBI head (still an LB4 code) also has the same two possible casting nos. available that
has a 30 degree top angle cut in the ports with the top of the ports having a small circular cutout on the top, but once again come with press-in rocker studs. The '94-'95 TBI head is
the same as the '94-'95 CPI head, except for the press-in versus screw-in stud issue (although sometimes the TBI engines come with screw-in rocker studs as well). The '94-'95
heads (both TBI & CPI) are different from the '92-'93 CPI & '93 TBI heads only in that the top angle cut in the ports is 30 degrees versus 8 degrees (and of course there is still the
press-in versus screw-in rocker stud differences of the TBI & CPI heads). The '96-up heads (still L35 as well) on the CMFSI engines have head casting no. 10235772 which is
different from '92-'95 heads due to the different intake bolt mounting pattern to accomodate the newer style intake manifold. These heads come on both the '96 up VIN X & VIN W
engines."