Safe to bore a 383 60 over?
I just want to add some experience, after doing dozens and dozens of over the fender re-ring jobs.
As an apprentice, I spent 4 yrs doing what I was told.
I had an absolutely amazing mentor .
It was not uncommon in our shop, and thousands of shops across the nation, to de-glaze, hone and re-ring engines.
It was common, and Hastings recommendation for taper was something like 2 thou per inch diameter, max 12 thou, iirc.
Knowing what a race engine tolerance should be compared to a daily driver has proven to be different.
I guess, during my apprenticeship, I musta re-rung an engine a month, we serviced these vehicles for decades, I know some of these engines lasted decades with rings sealing fine, regular tune-ups with plugs read showed no oil burning issues.
It was common to do a valve grind at 60- 80k miles, and a re-ring at 100 - 120k miles, - no re-bore, taper up to 0.008 .
I know the theory, but hundreds of thousands vehicle were re-rung regularly with no issues.
So an engine only lasting 10k miles on a re-ring would likely be the exception to the rule on a street driven vehicle.
If it wasn't a successful procedure, it wouldn't have continued for decades .
A few we did were not successful, - but those were kinda expected, with the customer being warned before the effort .
I've read and woulda believed all the books, - if I hadn't done or authorized more than well over a hundred no re-bore re-rings with successful results.
Sorry, but it's the truth .
P.S. I kinda got a kick outta the 62 Pontiac (Canadian) 283 that was the very first re-ring I ever did, came in year after year running like a Swiss watch . lol
https://www.enginebuildermag.com/2012/01/cylinder-bores-machining-to-sleeving/
I just want to add some experience, after doing dozens and dozens of over the fender re-ring jobs.
As an apprentice, I spent 4 yrs doing what I was told.
I had an absolutely amazing mentor .
It was not uncommon in our shop, and thousands of shops across the nation, to de-glaze, hone and re-ring engines.
It was common, and Hastings recommendation for taper was something like 2 thou per inch diameter, max 12 thou, iirc.
Knowing what a race engine tolerance should be compared to a daily driver has proven to be different.
I guess, during my apprenticeship, I musta re-rung an engine a month, we serviced these vehicles for decades, I know some of these engines lasted decades with rings sealing fine, regular tune-ups with plugs read showed no oil burning issues.
It was common to do a valve grind at 60- 80k miles, and a re-ring at 100 - 120k miles, - no re-bore, taper up to 0.008 .
I know the theory, but hundreds of thousands vehicle were re-rung regularly with no issues.
So an engine only lasting 10k miles on a re-ring would likely be the exception to the rule on a street driven vehicle.
If it wasn't a successful procedure, it wouldn't have continued for decades .
A few we did were not successful, - but those were kinda expected, with the customer being warned before the effort .
I've read and woulda believed all the books, - if I hadn't done or authorized more than well over a hundred no re-bore re-rings with successful results.
Sorry, but it's the truth .
P.S. I kinda got a kick outta the 62 Pontiac (Canadian) 283 that was the very first re-ring I ever did, came in year after year running like a Swiss watch . lol
https://www.enginebuildermag.com/2012/01/cylinder-bores-machining-to-sleeving/