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That's excellent pricing on the short blocks. The forged 2.3L is about $2100 in just parts from ExtremePSI. The last 4 cylinder motor I built was $450 in just the machine shop bill for hot tank, bore/hone, line hone, and polish and balance a good used crank crank.
Everything is rebalanced if it needs it. For additional cost we will do whatever the customer wants also. IE, put your flywheel/clutch on the entire rotating assembly and balance everything.
We also do full long blocks and ship them.
A lot of times we have customers buy new frontcases from us, we install the balance shaft eliminator stuff in it, install it, and that comes preinstalled with the short block for an additional $342, plus it comes prelubed/primed so the engine builds oil pressure instantly on first start.
We also install oil pans/pickups, trays, rear main seal, etc for those who don't want the responsibility in making sure if their pan seals or not.