340 main cap fit?

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couper 340

couper 340

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FABO Gold Member
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I have two 340 blocks one had one main cap only so i got some from a a-body member . the cap on the engine was 2 1/4 '' from top to bottom ,THE SAME AS THE OTHER BLOCK . the caps that i got were only 1 7/8'' from top to bottom . The trouble is the bolts bottom out before there get tight . So if i have the block line bored with these caps they won't fit for sure . does anyone know why they are different size other than they were cut at some point? thanks Couper
 
MIKE THANK YOU FOR THAT INFO . I was told that all 318 and 340 caps were the same by more than one person . I was given bad info when looking for caps now with the good info i will look for a set of 340 caps . THANKS AGAIN FOR THE HELP.
 
you got scammed by people who know no better.... no need to thank me, my name aint mike... :sign3:
 
Does anyone have a set of 340 main block caps for sale ?
 
I can look - but not until the weekend. I think I may have a set or two but they'll be buried.
 
You can still use the 318 caps even though they are cast a little smaller than the 340 caps. Just keep in mind that they aren't as strong. Get some 271/318 main cap bolts and you're set. You need to get the block line honed though.

Ken
 
Or you can order up a set of much stronger aftermarket set. Some have a flat surface so you can mount a stud girdle on it no problems.
 
I believe Milodon and Mopar Performance also make caps for 340 blocks. Mancini Racing or Summit Racing probably can get what you need.
 
Pro-gram also makes caps.
I do remember a member on here making much stronger caps that have a flat top/bottoms so a girdle could be mounted if wanting to. I just can't remember his name.
 
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