327 Hh
07-23-2008, 06:33 AM
#1
Drifting
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327 Hh
What are the differences between the 1966 327 HH and the 1966 327 HE other than the carb, air injection reactor, and exhaust manifolds? What are the differences between the Holley R3605A #3884505 and the Holley R3367A #3890499? Thanks.
07-23-2008, 08:51 AM
#2
Le Mans Master
in '66 the "HH" code specified a base 327/300 with manual trans and K19 A.I.R. system. The "HE" code specified a base 327/300 with manual trans and no A.I.R.
The K19 A.I.R. system was only for California cars.
The #3884505 carb was used on both SB motors, the 300hp and 350hp rhat did NOT have the A.I.R system.
The # 3890499 carb was used on the same SB motors, 300hp & 350hp, but WITH the A.I.R. system
The K19 A.I.R. system was only for California cars.
The #3884505 carb was used on both SB motors, the 300hp and 350hp rhat did NOT have the A.I.R system.
The # 3890499 carb was used on the same SB motors, 300hp & 350hp, but WITH the A.I.R. system
07-23-2008, 10:26 AM
#3
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In addition to Barry's good information, the distributor weights and springs resulted in a different advance curve and initial timing between the two.
The carbs differed in jetting, I believe.
The carbs differed in jetting, I believe.
07-23-2008, 10:36 AM
#4
Le Mans Master
Mike
would I be correct in assuming (i have no idea about these two carbs so only guessing) that with the K19 the #3890499 carb would have had a ported vacuum connection on it for distributor vacuum advance? I guessing that if the car had A.I.R. on it for emissions that they also went to ported vacuum for the same reason as they did in later years which would also explain why they used different advance curves in the distributors between the HH and HE motors
would I be correct in assuming (i have no idea about these two carbs so only guessing) that with the K19 the #3890499 carb would have had a ported vacuum connection on it for distributor vacuum advance? I guessing that if the car had A.I.R. on it for emissions that they also went to ported vacuum for the same reason as they did in later years which would also explain why they used different advance curves in the distributors between the HH and HE motors
07-23-2008, 11:21 PM
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There are no internal differences, and both engines used the same distributor in '66. The two carbs differed primarily due to the large air inlet in the right rear corner of the baseplate on the 3605 for the A.I.R. mixture control valve, leaner primary jetting, and "ported" vacuum for the distributor. 
07-24-2008, 09:00 AM
#7
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I show the #1111117 distributor used w/a.i.r. #1111153 distributor used wo/a.i.r.
[QUOTE=JohnZ; and both engines used the same distributor in '66.
[QUOTE=JohnZ; and both engines used the same distributor in '66.
07-24-2008, 09:12 AM
#8
Le Mans Master
For '66 my book shows the #1111153 distributor used for the 300hp motor. It doesn't specify with or w/o the K19 so it looks like it was used for all versions of the 300hp in '66.
my NCRS Spec Guide is the 4th edition, Spring 2004, so don't know if it's been updated or changed since than.
07-24-2008, 07:53 PM
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My source was Alan Colvin, Chevy by the Numbers and my fading memory. I have another souce I can check, the '66 overhaul manual, if it's important to anyone.
In Colvin's book, it shows a different distributor part # for A.I.R. and non A.I.R. applications for not only Corvette but Chevy II, Chevelle and Pass car for the 1966 327/four barrel.
A footnote also says some sources say the #117 is shown used for PG engines also but he couldn't confirm that.
One of those early Calif. A.I.R. engines had initial timing set way after TDC. The rest of them set BTDC. I thought it was the '66-'67 engines. I can look if need be but the book isn't handy.
In Colvin's book, it shows a different distributor part # for A.I.R. and non A.I.R. applications for not only Corvette but Chevy II, Chevelle and Pass car for the 1966 327/four barrel.
A footnote also says some sources say the #117 is shown used for PG engines also but he couldn't confirm that.
One of those early Calif. A.I.R. engines had initial timing set way after TDC. The rest of them set BTDC. I thought it was the '66-'67 engines. I can look if need be but the book isn't handy.
07-25-2008, 12:08 AM
#10
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Thanks for this information!
My 66 also has one of the 327 300hp AIR HH code( California) (1 of 2389) I was excited to see that this tread was started on this suject.
Thanks,
Dana
Thanks,
Dana
02-06-2019, 12:31 PM
#11
My source was Alan Colvin, Chevy by the Numbers and my fading memory. I have another souce I can check, the '66 overhaul manual, if it's important to anyone.
In Colvin's book, it shows a different distributor part # for A.I.R. and non A.I.R. applications for not only Corvette but Chevy II, Chevelle and Pass car for the 1966 327/four barrel.
A footnote also says some sources say the #117 is shown used for PG engines also but he couldn't confirm that.
One of those early Calif. A.I.R. engines had initial timing set way after TDC. The rest of them set BTDC. I thought it was the '66-'67 engines. I can look if need be but the book isn't handy.
In Colvin's book, it shows a different distributor part # for A.I.R. and non A.I.R. applications for not only Corvette but Chevy II, Chevelle and Pass car for the 1966 327/four barrel.
A footnote also says some sources say the #117 is shown used for PG engines also but he couldn't confirm that.
One of those early Calif. A.I.R. engines had initial timing set way after TDC. The rest of them set BTDC. I thought it was the '66-'67 engines. I can look if need be but the book isn't handy.
the car i am working on is a HR code engine, 1966 327 K19 option with powerglide
trying to see how many original parts im still left with thanks
02-06-2019, 01:00 PM
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2015 C2 of Year Finalist
There should be a metal tag around the base of the distubtror with the part number and date
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mrhurt (02-06-2019)
02-12-2019, 07:23 AM
#13
