Suffix code HH

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Mar 30, 2004 | 11:37 PM

jobberone

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jobberone

Joined: Aug 2003

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From: Kailua Kona HI

Suffix code HH

I get this as a 65 300 or 365 engine. Anyone know of this code on a 68 engine either 327 or 350? The block is 3914660 and the crank for this engine is 3911001 so it appears to be a 68 and not a 65 to me. My knowledge and data base is limited though.

Mar 31, 2004 | 02:33 AM

ghostrider20

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Re: Suffix code HH (jobberone)

Quote
I get this as a 65 300 or 365 engine.

In 1965, the HH code applied to the 365 HP option W/O AC and manual trans.

Mark

Mar 31, 2004 | 04:02 AM

jobberone

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jobberone

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From: Kailua Kona HI

Re: Suffix code HH (ghostrider20)

That's what I get. Someone has a 68 for sale with an HH code. There seems to be occasional odd ball engines with non-conforming codes but I'm confused by the 68 numbers and a HH code.

Mar 31, 2004 | 05:35 AM

Denney

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From: 20 forward gears to shift through in MD

Re: Suffix code HH (jobberone)

"HH" was also used for the 1969 model year and it was a 350ci, 300hp, 4Bbl, TH400 application for passenger cars. By the way in addition to 1965 Corvette applications, the "HH" code was also used for 1966-67 Corvettes (327ci, 300hp, 4Bbl, a/c, manual trans). :thumbs: So, if the casting indicates a 1968 calendar year, it is likely the 350ci passenger car application. :cheers:

Mar 31, 2004 | 12:56 PM

JohnZ

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From: Washington Michigan

Re: Suffix code HH (Denney)

NCRS shows usage of the 4660 block in '68 as "unverified", and there was no "HH" suffix used in any '68 model year Chevrolet application. :thumbs:

Apr 4, 2004 | 10:25 PM

jobberone

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jobberone

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From: Kailua Kona HI

Re: Suffix code HH (JohnZ)

Thanks all. This is really a great forum.

Sep 7, 2023 | 11:30 PM

zcon97

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Quote:

Originally Posted by jobberone

I just picked up the same block today all the date codes are correct for a 1968 327 and has the HH suffix. However, some sites list the casting as a 1969 350. I haven’t pulled the pan to check the crank yet.