Bakerlite
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Well in that case. give it a whirl !!!I like Rusty's answer!
Well in that case. give it a whirl !!!I like Rusty's answer!
Stock factory bearing clearance for a 1970 340 is .0005 to .002
Run it!
So, this how to fix your clearance. Looks like if you use the next size (as explained in the text) bearing (important - installed all in the same position) that you will get the 2-2 1/2 clearance that you want.Just a quick word from Clevite;
View attachment 1715926163
Buy the set of bearings that gets you clearance you want.
I think the clearance is perhaps only slightly tight. The clearance allows for proper oil flow. And certainly the modern oils of today are better, and flow better than the oils from the era of these engines, which can allow for smaller clearances.I like Rusty's answer!
The first question that requires an answer is, are the journals std or ground undersize.Just order a set of bearings with the undersize you need to get the clearance you want. But make sure your measuring is accurate.
King will make whatever you want.
View attachment 1715926013
Depends on what you are doing with the motor. Green for a motor to last high mileage, but not for all out racing (this is what I use). The others depend on your application. Rule of thumb, the more clearance you have the easier the crank moves, but you need to change the bearings more often.Set New Main Bearings in the 273... Wanna do a Plastigauge test.
I have Red, Blue and Green. What Clearance am I looking for?
Green is .001-.003
Red is .002-.006
Blue is .004-.009
So, Which One?
I thought you used plastigauge dry, am I wrong on that?Make sure you use some oil on the plastigauge and bearings during the test,
I always used a drop of oil on mine.I thought you used plastigauge dry, am I wrong on that?