That’s perfect . Don’t rebuild your motor for nothing ! So many in club do , can cause way more trouble than help — so dependent on skill of machinist . One of 100 ‘s of possible errors, you own it . Been there . If you really want an accurate test , drive at least 30-40 miles and do it . But why if running ok? It is normal for variations to happen in ring seal etc at slow crank . Unless using a lot of oil or there is antifreeze in the oil , or something broken leave it alone . A bad valve would drop one cylinder a lot .a bad cylinder would repetitively foul a plug and burn oil . Remember Jerry Kocur ? 330 k(?) on first 413 , another 300 k on second build . 392 were known to hit 300 . Mileage is the parameter if no oil burn .Even then a timing chain ( check) and reseal leaks would come first I have had two Jeep 4.0 go over 300 , one I have now at 280 k uses no oil ( mobil one) between 10 k mile changes . I read research by SAE on oil durability , they used 350 chev . They kept running it ( various kinds) and doing careful lab tests every 1 k or so — NO degradation of Mobil one at 17000 miles . Frequent oil changes sell oil and make profitable work . And at 17 k it was a slow decrease in additives. The AMC 4.0 series are great motors like the slant six , although chrysler messed them up in 2000-2002 with a bad “new design” head castings ( crack) and cheap pistons (skirts break off) Get involved with mechanics , what needs rebuilding is your wallet . Mho John
-- Sent from my iPhone On Sep 3, 2022, at 9:17 PM, Nick Taylor <nicksgaragesd@xxxxxxxxx> wrote:
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