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Old 10-05-2015, 09:42 PM   #9
71CHEVYSHORTBED402
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Join Date: Feb 2009
Location: Northern Nevada
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Re: 1969 chevy cst big block

Quote:
Originally Posted by trac209 View Post
From what I read they created those to salvage a flaw in a whole bunch of off the assembly line 396 blocks. They were bored over to avoid them being junked.
Makes sense.

Once upon a time, I thought I heard the 396 heads had larger ports and therefore more compression. If I recall, it was 10:1 Vs 8.5/1. The heads on my rebuild came off a 396. Note: I don't know a lot about engines. I just did the R and R, with my buddy who led.
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71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring the truck from ground up. With assys, the guide accts for 1000s details, OEM identifications & part numbers, written in short order. 700+ images of assm., illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025
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