340 Main bearing caps.

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sireland67

sireland67

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I was given a 340 by a friend of mine, but it is missing the main bearing caps.
Can I take the main bearing caps off a 318, line bore the engine and be ok?

I just don't want it to end up more of an issue than its worth, since I already have an extra 340 that is complete, and this block has rust in the bores.
Also I could use the bolts and windage tray if anybody has an extra one laying around.
 
It CAN work, but 340 caps are actually a little taller, I suppose for strength reasons...but I have used 318 caps before
 
I thought they might work, but did not know that they are taller, might be for the windage tray?
 
The trick is finding a set that match up as close as possible to make line bore easier
 
I have a couple sets, still may just throw this engine in the corner of my out building and forget about it, just checking out my options.
 
autoxcuda said:
It took 3 rear main caps to find one that was right for a line hone one my 340 block.
Click to expand...


Yep, the number 5 cap is the toughest to get correct. You can fudge a bit on the thrust main but the rear cap better be dang close or you will have a nightmare.
 
and i think the old 318 poly will work too.i think they are a bit bigger than an LA 318 and a bit smaller than the 340.
 
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