5/16" - 18, but haven't found the length. An Econoline with a straight 6 used a 1 1/8" long bolt. Probably really close to that.

 

Ok. Thanks so much. I’ll give them a try.

 

I found that my old 289 exhaust manifold bolts worked perfectly. Upgraded to HiPo manifolds that needed new bolts, and had a pile of the others left over. That and... well.... I lost my starter bolts so had to use something lol.

 

Related: What to do with a cooler full of old bolts/miscellaneous...

 

#352464-S8 = Bolt - Starter to Engine Block
5/16"-18, 1-1/8" long, 47/64" thread length, hexagon-head bolt

 

not sure about your 6 cylinder but all the v8 ones i have seen from 65 through the fox bodies were a special bolt 3/8-16 with a 1/2" six point head.
npd has them


ken

 

Thanks everyone for all of your replies. Appreciate it. It turns out that the 3/8-16 is the correct one for my application. I should have given more information about my situation. I have replaced a C4 transmission with a 3.03 manual. The C4 had a three bolt starter. Those starter bolts were too small for my new bellhousing. Most likely those bolts are the 5/16-18 that many of you mentioned. My new starter is a two bolt pattern. I was able to find the 3/8-16 at my local hardware store. Follow up question: should there be a washer applied to the bolt? If so, flat or lock (or perhaps both)? Thanks

 

Yes, split lock washer.

 

these are the bolts ford used 3/8=16 1/2" head

MOUNTING KIT, STARTER - 11002-5AK - National Parts Depot

Buy Part#11002-5AK - MOUNTING KIT, STARTER

www.npdlink.com

 

Ok Thanks. Kb65- appreciate the link to npd. I did find some at a hardware store yesterday, but I think I’ll order those up as well. Hopefully I’ll be able to get the car started back up early this week. Thanks again.

 

The orginal bolts are 3/8 16 with a 1/2 inch wrench head . There about 1 1/2 inchs long . I have a few left over from years gone by .