A set of sleeves, rings, and pistons is $160 - pretty modest in my book. The bigger question is the cost to rebore the block and the prices quoted on here vary substantially. I would figure a MINIMUM of $25 per hole and that may be optimistic depending on your location.
I've been on "real tight budgets" or so I thought when I was younger and I have honed and knurled, and re-ringed a few engines to avoid paying the price for boring and new parts. Never seemed to last real long or run real good and I usually wound up doing it over and doing it "right" in short order.
I'm sure that makes you feel real good but I'm afraid it's pretty accurate given your numbers which I don't think even make the MARGINAL threshold. It is a low RPM, low compression, low power flathead so it will run longer with things looser than most but it's a short term stop gap at best. How long before you are off your very tight budget and flush enough to bore and sleeve it and how long can you expect it to hold together without boring and sleeves. Are all you looking for is enough to get you through to summer or does it have to go a couple years? What situation is it going to leave you in if it craps in a 3-4 months? That would seem to be the question because if you are really using it it WILL need to be bored and sleeved in the not too distant future.
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