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Discussion Starter #1
Hi guys, does anyone know the stock pulley sizes and number of grooves for a 69 427 BB?
I will be running power steering, water pump and alt.
I built from scratch so I have nothing to judge by.
Thanks in advance
Jeff
 

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The pulley you need is the three groove #3937788 which will suit any 69 BBC with N40 power steering, and/or A.I.R., and/or A/C.
Alternator and water pump are standard on all engines.

Not 100% sure of the diameter, but from memory the larger Alt & WP groove is about 7-1/4", and the two smaller PS & A/C grooves are around 5-1/2" - 6".

I think this guy has listed the last digit of the part number wrong.
http://cgi.ebay.com/ebaymotors/396-427-454-CHEVROLET-CHEVY-BBC-A-C-CRANK-PULLEY_W0QQcmdZViewItemQQcategoryZ34202QQhashZitem110098305746QQihZ001QQitemZ110098305746QQrdZ1QQsspagenameZWDVW
 

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Discussion Starter #3
Thanks BlackoutSteve, will I need the three groove crank pulley if I'm only running PS and ALT and WP?
I'm building from scratch so I have no mounts or pulleys to judge by.
Thanks
JZ
 

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The front-most groove is your WP & Alt. (and A.I.R.), the 2nd groove is for your PS, and the 3rd is your A/C.

If you're not running A/C (Woops, I somehow assumed you were) then use the 2 groove pully # 3937786.

But after reading this..
http://www.camaros.org/pdf/pulleys-69-2007-02-01.pdf

I think you need 3955290 with PS..

This one is 3955292 for 396 with no PS..
http://cgi.ebay.com/ebaymotors/1970-Impala-Chevelle-Camaro-Pulley-BBC-396-454-RARE_W0QQcmdZViewItemQQcategoryZ34202QQhashZitem260051747257QQihZ016QQitemZ260051747257QQrdZ1QQsspagenameZWDVW

I'm not sure the 427 L72 and the L34/L35 would use the same pulleys, maybe you need the 3955291/L78 pulley listed here
http://cgi.ebay.com/ebaymotors/396-375-HP-Crankshaft-Pulley-3955291-deep-groove-repro_W0QQitemZ330034259843QQihZ014QQcategoryZ38656QQrdZ1QQssPageNameZWD1VQQcmdZViewItem
 
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