Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error

Login


Take the time to read our Privacy Policy.

BIGCAV Offline
#1 Posted : Monday, 30 August 2010 11:43:41 PM(UTC)
BIGCAV

Rank: Member

Reputation:

Groups: Moderator, Registered
Joined: 22/04/2010(UTC)
Posts: 473

Hi guys

Can anyone tell me a few things about adr27 and the 350 chevs

what date did adr27 come in? iv read july/august 1973 right threw to late 74 so im not certain

does anyone know how many 350 chev's were built to adr27 specs?

what did they change on the 350's?

were the significant majority of hq 350's pre adr27?

thanks
HK1837 Offline
#2 Posted : Tuesday, 31 August 2010 5:26:46 AM(UTC)
HK1837

Rank: Veteran

Reputation:

Groups: Moderator, Registered, Veteran
Joined: 1/03/2005(UTC)
Posts: 14,568

Thanks: 1 times
Was thanked: 480 time(s) in 458 post(s)
ADR27 was introduced on 1st January 1974, but was applied a bit earlier by GMH. As most of the 350 powered HQ's were produced prior to the end of 1973 the bulk of them will be pre ADR27. There are some later than late 1973, especially Statesmans.

What was changed on the ADR27 350's was (quoted from the bible):

Heads
Exhaust valve springs
Pistons
Rings
H balancer
Thermostat
Dip stick
Auto dizzy
Fuel line
Intake
Carb
Air cleaner
Revised power steer and aircon mounting.

_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?
_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?
Rhys Offline
#3 Posted : Tuesday, 31 August 2010 5:34:54 AM(UTC)
Rhys

Rank: Member

Reputation:

Groups: Registered
Joined: 7/03/2005(UTC)
Posts: 397

Was thanked: 1 time(s) in 1 post(s)
Hi Cavan,

My HQ 350 was built in October 1973 and doesn't have ADR27 listed on the compliance plate.

Did ADR27 make any difference to the performance of the 350s?

Rhys
HK1837 Offline
#4 Posted : Tuesday, 31 August 2010 6:05:16 AM(UTC)
HK1837

Rank: Veteran

Reputation:

Groups: Moderator, Registered, Veteran
Joined: 1/03/2005(UTC)
Posts: 14,568

Thanks: 1 times
Was thanked: 480 time(s) in 458 post(s)
Not so much ADR27 AFAIK, but the specification of the engines coming from North America. Remember US engines were pretty much strangled after 1970, especially ULP introduction in (from memory) 1972.

_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?
_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?
BIGCAV Offline
#5 Posted : Tuesday, 31 August 2010 6:33:14 AM(UTC)
BIGCAV

Rank: Member

Reputation:

Groups: Moderator, Registered
Joined: 22/04/2010(UTC)
Posts: 473

thanks hk1837, clears it up a bit for me

much appreciated
Franklin Offline
#6 Posted : Tuesday, 31 August 2010 7:03:58 AM(UTC)
Franklin

Rank: Member

Reputation:

Groups: Registered
Joined: 26/12/2008(UTC)
Posts: 76

Thanks: 5 times
hi
would this mean that the 350s imported after '72 (assuming this was the intro for unleaded in the USA) would have hardened valve seats?
franklin
HK1837 Offline
#7 Posted : Tuesday, 31 August 2010 7:36:34 PM(UTC)
HK1837

Rank: Veteran

Reputation:

Groups: Moderator, Registered, Veteran
Joined: 1/03/2005(UTC)
Posts: 14,568

Thanks: 1 times
Was thanked: 480 time(s) in 458 post(s)
As far as I know, yes. This is the reason why 882 cast heads after 1972 are renowned for cracking as the seats are only flame hardened, just like VL V8 heads were.

_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?
_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?
RigPig Offline
#8 Posted : Wednesday, 1 September 2010 6:11:21 AM(UTC)
RigPig

Rank: Member

Reputation:

Groups: Registered
Joined: 29/07/2006(UTC)
Posts: 763
Location: in the shed

Thanks: 8 times
Was thanked: 14 time(s) in 13 post(s)
quote:
Originally posted by HK1837
As far as I know, yes. This is the reason why 882 cast heads after 1972 are renowned for cracking as the seats are only flame hardened, just like VL V8 heads were.
_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?


Theres a number I'm not aware of, what are 882 heads?

I thought HQ 350 head numbers went like this:
3932441 for 71,72...3973487 for 73 and 3973487uu and 3998993uu for 74

"I would never want to be a member of a group whose symbol was a guy nailed to two pieces of wood" (George Carlin)
"I would never want to be a member of a group whose symbol was a guy nailed to two pieces of wood" (George Carlin)
HK1837 Offline
#9 Posted : Wednesday, 1 September 2010 6:36:57 AM(UTC)
HK1837

Rank: Veteran

Reputation:

Groups: Moderator, Registered, Veteran
Joined: 1/03/2005(UTC)
Posts: 14,568

Thanks: 1 times
Was thanked: 480 time(s) in 458 post(s)
882's weren't on GMH vehicles as far as I know. They were just a common head used after 1972 on heaps of SBC's. One of the most found on those running 2nd hand imports that flooded into Australia in the 80's and early 90's. I've got them here in 350 and 400 specification. And renowned for cracking.

_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?
_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?
D. A. Barnes Offline
#10 Posted : Sunday, 19 September 2010 8:35:49 PM(UTC)
D. A. Barnes

Rank: Member

Reputation:

Groups: Registered
Joined: 28/02/2009(UTC)
Posts: 202

You guys all need the little black book from Warwick to clear this up. $50 was a really small price to pay for something that will give the answers you need. Quoting from it on p12 are the cylinder head numbers 3973487, 3988820, 333882 which apply to the 1973 and 1974 engines. ADR27 spec engines entered production from 9/73 but not all have the trade mark two piece top radiator hose with the christmas tree fitting in it. Engines with the 333882 heads also got the 320234 inlet manifold and the 1112044 distributor.
Users browsing this topic
Guest
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Powered by YAF | YAF © 2003-2024, Yet Another Forum.NET
This page was generated in 0.107 seconds.