Replacement Crank Pulley Mercruiser 5.7

[carrera205]

Trying to find a replacement for the crank pulley for my 5.7. Despite all of my carful storage it seems to have walked away. I'd love to replace it with a nicer pulley but not sure on the spacing needed since i don't have the original part! Anyone replaced theirs with a newer one?

 

[alldodge]

Assuming V belt right?
Have a serial number of the motor, or at least a year?
How many V's did it have, 1 to 3?

 

[carrera205]

AllDodge sorry totally forgot the details... rookie mistake. Originally it was a 5.7 built in 90' with the triple groove pulley. I recently switched it out for a newer vortec motor. It has the short water pump. Serial on the motor is 10243880 it's a 5.7 LG SGI

 

[alldodge]

Your serial number is not listed, but being the 1990's it should be
5.7L GM 350 V-8 1988-1995 - 0B525982 THRU 0F600999

A 3 groove pulley should be 90081A1 (item 16)
https://www.mercruiserparts.com/bam/...31888/1014/300

Says its NLA but provides dimensions as
Length: 8.20 Width: 7.40 Height: 3.10

With the dimensions should be able to match up or find one on ebay maybe, like this

https://www.ebay.com/itm/90081A-Mer...788584&hash=item5d8a8584cd:g:l14AAOSwXcVcwj0C

 

[Scott Danforth]

or like this from VP https://www.ebay.com/itm/143238191181

 

[Scott Danforth]

BTW, ANY and i mean ANY GM SBC SWP lower pulley should work.

 

[achris]

.... Serial on the motor is 10243880, it's a 5.7 LG SGI

Nope, that's a block casting number and model, not a manufacturer's serial number.

Look here to find a serial number. (and what they should look like.)

http://forums.iboats.com/forum/engi...d-engine-serial-numbers?p=6661415#post6661415

 

[carrera205]

Ended up finding a guy on craigslist parting out a motor that still had the pulleys and other accessories. $30 later and I was able to get a direct match up pulley along with a number of other odds and ends. I did try a few pulleys from amazon that stated they were for SBC but they didn't line up properly with the water pump pulley.