Info On Bolt Sizes / Lengths for 1990 5.7 Mercruiser

carrera205

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May 2, 2011
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Looking for a good resources for bolt sizes for 1990 5/7 mercruiser!

A few years back i cracked the block (early freeze in Oregon) on my 5.7 and pulled it. I tried to preserve all of the bolts but after a few house moves it seems quite a few bolts have disappeared. Now that i'm getting a new long block and getting prepped to reassemble, i'm trying to figure out which bolts i have and which bolts are missing.

Is there a resource out there with an exploded diagram for bolt identification? Any help would be awesome!
 

Fun Times

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May 16, 2009
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You could try scrolling through each section of your engine model parts guide to help match up the bolts, studs and nuts for each item/section you're working on...Sometimes the general bolt and nut sizes are listed in he description area and if it's not listed in the website below you could try searching the part number online as other websites may have it listed too.
Also try running the part numbers online and in EBay to see if there's any photos of the bolts & nuts to help compare the ones you may find laying around the garage/moving boxes, etc..

https://www.mercruiserparts.com/5-7l-gm-350-v-8-1988-1995-0b525982-thr
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
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Post a few pics.

Items like flywheel bolts and crank damper are special. The rest are standard hardware

flywheel housing to block is 3/8-16 x 1-1/4
exhaust manifold bolts are 3/8-16 about 4-1/2" long
accessory mounting bolts are 3/8-16
intake manifold bolts - 3/8-16 x 1-1/4
 
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