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MAURICE BLENDHEIM · 01-07-2017, 07:09 PM

Mark…A 3914635 or 3914636 is a 1968 307 and are 3.875 bore, possibly the last number is filled in with casting making it into an "8". There are 1968 blocks with a casting number 3932386 that are 4.00 bore. Are your intensions to bore it to 4.00? Wondering what numbers are cast into block behind the timing cover? Hope this helps…Maurice.

01-07-2017, 07:09 PM	#5
MAURICE BLENDHEIM Senior Member Join Date: Jun 2011 Location: Langley (no igloos), British Columbia, Canada Posts: 569 Likes: 311 Liked 284 Times in 87 Posts	Re: block Id Mark…A 3914635 or 3914636 is a 1968 307 and are 3.875 bore, possibly the last number is filled in with casting making it into an "8". There are 1968 blocks with a casting number 3932386 that are 4.00 bore. Are your intensions to bore it to 4.00? Wondering what numbers are cast into block behind the timing cover? Hope this helps…Maurice.