Quote:
Originally Posted by Rich Biebel
The 305's came out when GM was going to change everything to the Metric system....but never really did.
The stock 305 bore is an odd number and I believe it may have been a metric dimension....
Most other GM engines were based on std. fractional sizes....
Only other odd one I can think of is a 396 bore.....4.093 ?
Metric 200 transmissions were used with the 305's.....
In the mid to late 1970's GM started using metric body bolts in some cars.....It was a pain to have to buy metric tools back then when everything else was std....
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Started working on the rear suspension of a Grand National and things were going smooth. Got a few bolts off, (those with English/Metric "close enough" fit dimensions I guess) until I got to the other Metric fasteners and realized I'd been had. Not a happy camper! Luckily Sears was still in business then and it was just a ride to the store.