so from gpr=
"We also perform a high density thermal-ceramic flow through the coolant passages within the block which remedies the porosity issues that these engines are known for and makes the engine much more resilient to higher-than-normal temperatures. This coating is extremely reliable and durable and allows the engine to disperse heat in a much more efficient fashion. Due to its impressive resistance to corrosion and high hardness rating, this process is used in many of today’s high-performance applications. "
and cannibal=
Exclusive Engine Block Water Jacket Hot Seal Process & Final Pressure Test: Unique Pressure Flow Technology designed to safeguard Water Jacket Walls of block against micro-fissures


any info on this procedure? what exactly are they doing?

I have been conversing with Drow.. about a diy equation of the same. it seems quite feasible. simple hot tank pressurized circulation of a chemical solution. plenty of options of products to seal the porous jackets, but which is the better option? they all appear to be a ceramic based product.
I really want to know what these guys are doing. it seems like a ceramic seal process. hoping some of you know more details.

 

Why oh why can't someone just make a modern readily available cast iron block of this engine. Eliminate the quirky aluminum porosity issues. The sleeve issues. Sorry zero help. Carry on.

 

that would take all the fun out of it.
didn't gm dump the alloy design in '63, for cast iron buick v6? something about heat treatment process causing a rejection of iron sleeves.
good thing rover ironed out that problem

 

Yeah. I think all Rover remembered when they came across the rejected GM design was...

...step 3: PROFIT!!!

 

Buick used to cast the steel sleeves in place (costly), Rover knowing so much about aluminum changed the process to pressing the sleeves after. hense our problem.

have you ever asked why all the stuff on the other side of the pond is running 215 Buick blocks?

do you think they might have been the first to find that 3.5 would drop a sleeve right down onto the rod,
and while waiting for Rovers fix (putting a reveal on the bottom of the cylinders.)
they went to the tried and trued 215 which will easy take a.40 overbore.