Dunno setting an IRS up for drag racing is a bit of a black art!
There is so much going on back there but at least we have one of the best designs for an IRS going so it doesn't have a lot of the bad habits that some have!
All of the rods have squirter holes
GTE block has squirter valves as well
Yes GTE pistons will work in a GE block they have a larger dish in the top to lower the comp
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