Slight crack in block... Safe or No
Oh, man, I could imagine:
NOTE: The people saying it will be okay haven't bet their lives on this little crack spreading on a motor hopped up to run high RPM, high torque and high power levels on an engine design notoriously unbalanced because of only one cylinder.
If this were your wife or your child would you let them run this block? NR has Predator blocks for $44. Clone blocks are $37.
NOTE: The people saying it will be okay haven't bet their lives on this little crack spreading on a motor hopped up to run high RPM, high torque and high power levels on an engine design notoriously unbalanced because of only one cylinder.
If this were your wife or your child would you let them run this block? NR has Predator blocks for $44. Clone blocks are $37.
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Basically it is scrap but I wouldn't be afraid to put a plastic plug in it with some liquid pipe sealant and run it until it gives. I don't think it will change.
I have some custom ported 289 heads that have had cracks in the rocker stud bosses since the bosses were machined (40 years ago), taped and the machinist forgot to chamfer the holes and the studs round shoulder spread the bosses just enough to crack every one of them. I have turned that motor 8 grand so many times I cant count. Never a change.
I would run it just to see if it would change.
Doug
I have some custom ported 289 heads that have had cracks in the rocker stud bosses since the bosses were machined (40 years ago), taped and the machinist forgot to chamfer the holes and the studs round shoulder spread the bosses just enough to crack every one of them. I have turned that motor 8 grand so many times I cant count. Never a change.
I would run it just to see if it would change.
Doug
mostly relevant as I think back to the early 70's as we ran around with our minis that were put together in the same spirit as a tree house and by this I mean with junk parts put together by kids that had no idea what they were doing chains were breaking I would ruin wheel bearings by over tightening them with no support thing would fall off from vibration we rode around with no helmets and shorts I think the worst failure I had was forgetting to put the snap ring back on the mercury clutch and the drum moved outbored and the shoes flew out that hurt but did not break skin we were running bald tires or even solid tires anything we could bolt on and no one died or anything like that so I cant get to excited about a hairline crack in in a super low stress part of the block. but I will also concede that totally swapping al the parts to a new engine block may be better but keep in mind that all the moving parts in your present engine have already matched them self to the block that you now have and may not seal or ride correctly in the next block . so where do I draw the line on these toys?? the flywheel if it has any damage in its bore it needs to be replaced have fun and do what you want life is full of choices