Re: Gm performance 305 block
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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Rich Biebel
S/C 1479
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