You should see if that 18RG is available to get a compression test to see what the actual numbers are.
You own the perfect solution for using that 18RG, you own a 8-RB or 8-RC engine which has smaller bores and if you have undamaged pistons from that 18R-GU, with a new set of standard rings and a Bore up of the 8-RB to the standard size. You can keep the original engine block in your car with the exchange and upgrade to the 18-RGU specification.
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