Photobucket
Members Login
Username 
 
Password 
    Remember Me  
Post Info TOPIC: Crank pulley...WTF


Addicted!

Status: Offline
Posts: 150
Date:
Crank pulley...WTF


 

Hi... So on a 454, should the crank pulley have 3 hole to attach to the balancer or 4 holes? I thought that the BB 396/427/454 were 3 bolts and the small blocks used 4 bolts to attach the crank pulley to the balancer?

 

Anyone have an answer??

 

Thx in advance



__________________


A Poncho Legend!

Status: Offline
Posts: 44147
Date:

Both are three bolt. The pulley actually will interchange except that center opening has the little lip in the back to center it in the balancer and of course the size of that hole is different between big and small block.

__________________

1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles "FAKE_66"



Addicted!

Status: Offline
Posts: 346
Date:

Crank Pulleys have three mounting holes as Carl has described.

Water Pump Pulleys have four mounting holes with the smaller centre hole that slides onto the water pump shaft.



__________________

72 Nova SS,   66 Beaumont Sport Deluxe,   09 Pontiac Solstice GXP Coupe



Addicted!

Status: Offline
Posts: 150
Date:


Hi... Thx Mike and Carl. Well I'm trying to find a crankshaft pulley (ASAP). Mike thinks he has one... But I googled and started looking and Summit/Jegs show them with 4 holes, but description says Crank not WP.
Checked a couple of other sites, Musclecars, Corvettes, Chicago Vettes, some 3 hole, some 4 hole. They have a part # for these, I have no part # as usually stamped on the part by GM.

Little confusing, thought there might be an ironclad "rule"...

THX Guys

__________________


A Poncho Legend!

Status: Offline
Posts: 44147
Date:

I've parted many big block cars over a few decades and certainly have never encountered any 396/427/454 with a 4 bolt crankshaft pulley. I've never parted any solid lifter engines. Maybe they have a 4 bolt flange? Although I be surprised if that is so, they do have the deep groove pulleys to keep the belts from coming off at high RPM.

__________________

1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles "FAKE_66"



A Poncho Legend!

Status: Offline
Posts: 44147
Date:

I just googled "big block chevy crankshaft pulley", clicked images and couldn't find one 4 bolt crank pulley. I'm betting Summit and Jegs have pictures that are not accurate for the part number.

__________________

1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles "FAKE_66"



Canadian Poncho Superstar!

Status: Offline
Posts: 19745
Date:

I have pictures that should help. This is a long neck water pump 

1. This is the best one I can find that shows the three bolt holes for the crank.

 

IMG_9862.JPG

 

 

 

2. This one shows my pulleys, 4 bolt water pump two groove and I did use the engine's 3 groove crank pulley. The reason for this is because the 454 did have AIR and that third groove was for that. If you have a three groove it should work with your two groove water pump pulley. Mine does. 

IMG_9708.JPG

 

3. A comparison of the size of the Rat and Mouse, remarkable that there is so much interchange of parts and fitment, the genius of General Motors.

IMG_9726.JPG

 

 

 

 



-- Edited by 73SC on Wednesday 28th of April 2021 01:56:25 AM

Attachments
__________________

Ray White, Toronto ON

1973 LeMans 454 "Astro-Jet"

Built March 9, 1973 - Oshawa ON

1993 Corvette Convertible LT 1

Polo green metallic & tan  - Bowling Green Kentucky 






Poncho Master!

Status: Offline
Posts: 1961
Date:

As the previous comments state, the BB Chev have 3 holes to bolt on the crank pulley. 
 In your other post you are looking for a two groove pulley, the one without the provision for AC. There stamped steel is a two year part and was replaced for simplicity with the 3 groove on everything whether it had AC or not.

Not sure if you're going for original looking or functionality.

It may help if you take a picture of your balancer for reference.

 Good luck with your search. 

 



__________________
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.

Tweet this page Post to Digg Post to Del.icio.us
.
Support Canadian Poncho!
Select Amount:
<
.
.
.