72 C20 402 Alt Belt question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**RPOZ11** · 01-01-2004, 01:53 AM

Greetings! Been some time now of owning my 1972 C20 402 truck but I keep experiencing alternator belt alignment difficulties. I switched over to using the internal regulated alternator with the ext by-pass press in kit. Would there be some sort of alternator discrepancies with belt alignment by using the later buigger alt's? Seems mine always sits towards the driver back to far and I tossed the belt the other day...Anybody had any experience or advice they can share on this?

*TRUCKSRUS* · 01-01-2004, 02:01 AM

how far back are we talking....????
should be able to washer the bracket out a little to get it lined up..
does every thing else line up????

what else you running...p.s. a/c etc.....do you have the correct pulleys???

**RPOZ11** · 01-01-2004, 02:04 AM

Well, I seems back at least a full pulley length , as I f i were to have had a double groove alt pulley. I have washered the stem of the top orig 72 alt bracket at the cyl head but I still cant get it to line up on the radiator side of the bracket.
I am using all of the orig GM BB 402 pulleys that are correct from it from 1st issue.

**RPOZ11** · 01-01-2004, 02:07 AM

I apologize for my poor typing habits/spelling!

*TRUCKSRUS* · 01-01-2004, 02:10 AM

sounds like the double alt. pulley would be the way to fly

**RPOZ11** · 01-01-2004, 02:12 AM

OK, well thanx!

I will continue to follow up here if I get any further assistance! Thanx Again!

*rage'nrat638* · 01-01-2004, 02:25 AM

there's a feature here called the search option....
i just did one for you....
here's a pic of a 402 stock short water pump...
check out the pulleys is that what yours looks like

*rage'nrat638* · 01-01-2004, 02:28 AM

here's the tread
http://67-72chevytrucks.com/vboard/s...ht=402+pulleys

**RPOZ11** · 01-01-2004, 12:25 PM

Yes Sir! That's the set-up! Im looking at thimking maybe the later internally regulated Alternator's lower housing spacer may be longer than that of the original issue alternator. I think maybe if I shorten that lower mounting pointe's end to end and use washers to fill the void on the reverse side I may be able to get the alt to move forward. Currently this alt Im using wont allow the alt to be adjusted from the front side of the top alt bracket...

*rage'nrat638* · 01-01-2004, 12:28 PM

kool...welcome buddy!!!!!!

**RPOZ11** · 01-01-2004, 12:30 PM

It just dawned on me I have my orig dated on off my old 1969 396 C20; I think Ill dig it out and compare the two...

Heavy-Chevy · 01-02-2004, 02:04 AM

*Ebay is easyer :has paypal, ratings on seller,shipping rates,you can compare with other sellers,& basicly straight forward.

* AGE: I see some with $35K+ garges ,year 2000+ corvettes,& Harley-Davidsons( basicly $$$$). Some of us are younger have 1 or 2 realy cool trucks ,BILLS,& a wish list....meaning some have money today & then the wife or kids need it . $2K is not hard to get , just hard to keep.

* "it Happens"- one time I was buying a bull ( had the $) 2 days before I was to make the transactoin my roof blew-off.Called the guy & the reply was " quit waisting my time........" . His loss I still got a Bull ,just 2 weeks later.
Also, "ON this Board" I was in a deal to get the much needed GMC S.S. hub caps & the board crashed ...

THat realy sucked!!

* It is true , some can get excited on what they see ( whole trucks) because the $ is right and the product is good , but then you realize it is just out of reach (distance). There is a Longhorn F/S right now I wished was closer. I did buy a truck near Lousiana from a board meamber (long drive with a parts truck comeing home).

* Then there is the big "M": spouse!!!You think it is great & they say yes & then chages their mind ........

* some are just plan .......

- There is no excuse....just reasons. I just wanted you (sellers) that you are the best ( helping us out with your knowledge & other stuff).

& some of us don't pc as much as others(MIAs)!

Hey I love yor 1972 SWB 4x4 2" Truck!

**RPOZ11** · 01-02-2004, 02:08 AM

What did I miss on this reply????

Heavy-Chevy · 01-02-2004, 02:11 AM

How the heack this get here????????????????????????

I replyed on anther thread & ?????

This whomps........

Sorry did not mean to get this here........

01-01-2004, 01:53 AM	#1
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	72 C20 402 Alt Belt question Greetings! Been some time now of owning my 1972 C20 402 truck but I keep experiencing alternator belt alignment difficulties. I switched over to using the internal regulated alternator with the ext by-pass press in kit. Would there be some sort of alternator discrepancies with belt alignment by using the later buigger alt's? Seems mine always sits towards the driver back to far and I tossed the belt the other day...Anybody had any experience or advice they can share on this?

01-02-2004, 02:04 AM	#12
Heavy-Chevy Registered User Join Date: Jul 2000 Location: Ennis (& Styx),Texas Posts: 1,325	Ebay is easyer :has paypal, ratings on seller,shipping rates,you can compare with other sellers,& basicly straight forward. AGE: I see some with $35K+ garges ,year 2000+ corvettes,& Harley-Davidsons( basicly $$$$). Some of us are younger have 1 or 2 realy cool trucks ,BILLS,& a wish list....meaning some have money today & then the wife or kids need it . $2K is not hard to get , just hard to keep. * "it Happens"- one time I was buying a bull ( had the $) 2 days before I was to make the transactoin my roof blew-off.Called the guy & the reply was " quit waisting my time........" . His loss I still got a Bull ,just 2 weeks later. Also, "ON this Board" I was in a deal to get the much needed GMC S.S. hub caps & the board crashed ... THat realy sucked!! * It is true , some can get excited on what they see ( whole trucks) because the $ is right and the product is good , but then you realize it is just out of reach (distance). There is a Longhorn F/S right now I wished was closer. I did buy a truck near Lousiana from a board meamber (long drive with a parts truck comeing home). * Then there is the big "M": spouse!!!You think it is great & they say yes & then chages their mind ........ * some are just plan ....... - There is no excuse....just reasons. I just wanted you (sellers) that you are the best ( helping us out with your knowledge & other stuff). & some of us don't pc as much as others(MIAs)! Hey I love yor 1972 SWB 4x4 2" Truck! __________________ TRUCKS & Autos that run: 1972 GMC Sierra Grande 3/4ton LWB 4x4 1972 Chevrollet K/5 with a 6"Lift, 462 heads "money pit" 1988 K3500 Crew "Big Red" 4x4 PARTS OR PROJECT TRUCKS: PARTS for sale or trade: WANT : 1972 parts blazer/Jimmy parts truck 1967-72 Parts Chevy/GMC Truck NEED stainless hubcap for 3/4ton GMC

01-02-2004, 02:11 AM	#14
Heavy-Chevy Registered User Join Date: Jul 2000 Location: Ennis (& Styx),Texas Posts: 1,325	How the heack this get here???????????????????????? I replyed on anther thread & ????? This whomps........ Sorry did not mean to get this here........ __________________ TRUCKS & Autos that run: 1972 GMC Sierra Grande 3/4ton LWB 4x4 1972 Chevrollet K/5 with a 6"Lift, 462 heads "money pit" 1988 K3500 Crew "Big Red" 4x4 PARTS OR PROJECT TRUCKS: PARTS for sale or trade: WANT : 1972 parts blazer/Jimmy parts truck 1967-72 Parts Chevy/GMC Truck NEED stainless hubcap for 3/4ton GMC Last edited by Heavy-Chevy; 01-02-2004 at 02:18 AM.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

01-01-2004, 02:01 AM	#2
TRUCKSRUS Account Suspended Join Date: Jan 2004 Location: GARAGE....CARDBOARD BOX Posts: 12	how far back are we talking....???? should be able to washer the bracket out a little to get it lined up.. does every thing else line up???? what else you running...p.s. a/c etc.....do you have the correct pulleys???

01-01-2004, 02:04 AM	#3
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Well, I seems back at least a full pulley length , as I f i were to have had a double groove alt pulley. I have washered the stem of the top orig 72 alt bracket at the cyl head but I still cant get it to line up on the radiator side of the bracket. I am using all of the orig GM BB 402 pulleys that are correct from it from 1st issue.

01-01-2004, 02:07 AM	#4
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	I apologize for my poor typing habits/spelling!

01-01-2004, 02:10 AM	#5
TRUCKSRUS Account Suspended Join Date: Jan 2004 Location: GARAGE....CARDBOARD BOX Posts: 12	sounds like the double alt. pulley would be the way to fly

01-01-2004, 02:12 AM	#6
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	OK, well thanx! I will continue to follow up here if I get any further assistance! Thanx Again!

01-01-2004, 02:25 AM	#7
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	there's a feature here called the search option.... i just did one for you.... here's a pic of a 402 stock short water pump... check out the pulleys is that what yours looks like

01-01-2004, 02:28 AM	#8
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	here's the tread http://67-72chevytrucks.com/vboard/s...ht=402+pulleys

01-01-2004, 12:25 PM	#9
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Yes Sir! That's the set-up! Im looking at thimking maybe the later internally regulated Alternator's lower housing spacer may be longer than that of the original issue alternator. I think maybe if I shorten that lower mounting pointe's end to end and use washers to fill the void on the reverse side I may be able to get the alt to move forward. Currently this alt Im using wont allow the alt to be adjusted from the front side of the top alt bracket...

01-01-2004, 12:28 PM	#10
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	kool...welcome buddy!!!!!!

01-01-2004, 12:30 PM	#11
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	It just dawned on me I have my orig dated on off my old 1969 396 C20; I think Ill dig it out and compare the two...



Register or Log In To remove these advertisements.

01-02-2004, 02:08 AM	#13
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	What did I miss on this reply????

Register or Log In To remove these advertisements.