[BrainleSS]

NEW GM Performance Parts LSX std. deck block latest generation. FULLY machined and ready to assemble. Block is machined to a 4.125" bore. Can build a 427" (4.0" crank) or 440" (4.125" crank), smaller cubes can be done as well with the benefit of a BIG breathing bore.
The block has been square decked using a BHJ fixture to 9.255". These blocks come at 'roughly' 9.260"-9.265" for a std. deck application.
Just a little was taken off, as necessary to square the decks from side to side.








The bores were done on a V40 RMC vertical block mill and are on true centers to blueprint. The block comes at 3.880", and now sits at a 4.125. The block was then torque plate honed with a 6-bolt BHJ plate and ARP Pro Series studs to a finish size of 4.1255"-4.1257" to run a typical forged aluminum piston with the necessary clearance.
The lifter bores were also checked for size and lightly honed for use of a std. lifter.

The block was washed thoroughly and the cam bearings bores were checked for size and aftermarket laser welded HD babbit cam bearings were installed. GM provides low grade 'clinch' type soft cam bearings that look like they have been ran already with the block kit when purchased.
This block is bagged and out of the elements. It includes all the hardware that came with it from GMPP. I have just about $3400 into it, selling for $2900 OBO.
It is ready to assemble!