Generation IV Internal Engine - L76 questions




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work in progress
08-21-2012, 06:21 PM
I bought an L76 to build for my camaro, and the builder is telling me the motor came with 243 heads compression is at 11.5 to 1 . Supposedly this motor came out of a tahoe that was warrantied. The highest compression I can find listed anywhere is 10.4 in a G8 gt, but that has different heads than what came in this Tahoe. The rotating assembly had material removed like it was internally balanced. Is this some kind of a screw up from the factory?? Trying to figure out where compression will be with L92's.


AW794
08-21-2012, 07:05 PM
I thought the L76 came with L92 heads from the factory

work in progress
08-21-2012, 07:22 PM
Not this one. It was in a tahoe, supposedly...


GA95DCMSS
08-21-2012, 07:29 PM
L76s did come with L92 heads...the L33, LH6, 5.3s were aluminum blocks and came with 243s. LC9s came with 799s I think.

Have you checked for the displacement cast anywhere into the block? What about the vin etched on the block on the backside?

work in progress
08-21-2012, 07:33 PM
Just found out it is a hybrid, it is an L76 and it does have 11.5 to 1 compression. So, going from 243 heads to L92's what will the compression be?

GA95DCMSS
08-21-2012, 07:55 PM
Oh so it's a LFA. I'vegot to find me one of those. Those are advertised as 10.7-10.8:1 comp with the 243s, but of course people have been wrong. Not shabby at all either way.

With L92s and their 69-70cc chambers, if it is in fact 10.7-10.8:1, you'd come to ~10.3:1.

work in progress
08-21-2012, 08:15 PM
I think it is going to be a fun build. I hope I end up making close to what the LS3's are making with the extra compression.