engine block question
Thread Starter
Moderator
Joined: Jun 1999
Posts: 7,117
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From: Dove Mountain Arizona
engine block question
Hi guys. I'm up in Seattle (rain) helping a friend rebuild his engine. He thought it was a 350 but the casting number says different. 391660 in Mortec says it's a 68 327. My question is this; the threaded hole in the block in front of the fuel pump rod is not there, it's just a cast solid. When did GM stop/start drilling this?
Race Director
Joined: Apr 1999
Posts: 10,866
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From: Beverly Hills/Pine Ridge Florida
I have a 65 327 250 HP block from a passenger car in my 37 Chevy coupe.
While changing the fuel pump a year or so ago, I too discovered that it was not, nor had it ever been drilled and tapped for the "retaining" bolt.
While changing the fuel pump a year or so ago, I too discovered that it was not, nor had it ever been drilled and tapped for the "retaining" bolt.
Drifting
Joined: Jul 2014
Posts: 1,544
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From: Massachusetts
Hi guys. I'm up in Seattle (rain) helping a friend rebuild his engine. He thought it was a 350 but the casting number says different. 391660 in Mortec says it's a 68 327. My question is this; the threaded hole in the block in front of the fuel pump rod is not there, it's just a cast solid. When did GM stop/start drilling this?
So, if your friend doesn't mind buying a new or used 350 crank, that engine could become a 350. Note that the pistons would also have to be changed if your friend wasn't already planning to replace them.
