Hello..
I'm assuming These have the nylon tooth gears timing sets from the factory..


About what mileage are they normally good for.?
Mine is not sloppy but it only takes on tooth to go awol..

 

It used to be 60-100k miles. If you still have an original set, I would change it out.

 

No idea if they are original or not.. 90k on clock tho, but timing is tight..

 

If you pull the fuel pump you should be able to see the gear and chain through the opening.

 

Thank you..
With the camera probe I should be able to..


My fear is if I go to do a chain I'll say welp I'm in there a cam and lifters,,
and it's all down hill from there..

 

Hey sometimes valve cover gaskets start that snowball effect...

 

I have found the mid 70's nylon timing sets seem to not fall apart like the earlier ones. The motors I pulled them out of were well taken care of and great shape inside. I am betting the nlyon was probably more heat resistant compared to earlier model's, not even a crack in the nylon. Both were 76 350's, so still 40 years old. Still a good idea to change it. A far as cam and lifters, either go with a cam like the smog 455 or vin 9 307 cam, a Lunati high efficiency series cam, or leave it alone. The stock cam sucks, only good for low emissions and maybe fuel economy.

 

And as always someone steps up to help spend your money...

 

Yes, my c-10 is under that snowball, Somehow a carb gasket on the 350 became a 489bbc swap /build.. I blame elves

 

All good, part of the hobby.. At least he kept it low key..
not a 455 swap with a 5spd stick.. bla bla bla..

 

Yes, they are nylon gears. I got about 92K out of my original timing gear on my 77, before it skipped a tooth...

 

That may have just been luck. I've thrown the chain on a 1980s 307 with about 120K on it (in my defense, I ASSUMED the mileage was actually 220K, and thus that the chain had already been replaced...). On the other hand, I opened up a 1971 350 with 115K on it to replace the chain, and the plastic teeth looked nearly brand new. Go figure (or else, someone replaced a worn timing set with a new plastic one - but who does that?).

 

Chrysler LA engines had those also with the same amount of success.

 

You are right Joe, it could have been luck. Let's face it, nylon gear teeth in a V8 was not a great idea for longevity. If in doubt, replace it.