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Old 08-04-2008, 10:09 AM
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Is Plastigauge good.

I'm getting ready to put another crank in my block.

Bearing clearances where not checked on the first crank. Hard lesson to learn.

Anyone use plastigauge? Any tips. Or advice for checking my clearances?

I did get micrometers, outside gauges, inside dial gauge. To use as well.

But I hear plastigauge is easier. But is it reliable?

Any comments on checking clearances for a chev 350 would be appreciated.

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Old 08-04-2008, 10:20 AM
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I would not hesitate to use plastiguage on any engine I intended to
use except maybe a hi preformance race engine, then I would rely
on mikes.
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Old 08-04-2008, 11:14 AM
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As Walt says, I've used plastigauge on lots of STREET engines, but if you have the instruments and know how to use them properly then by all means use them. There no way plastigauge can be as accurate as a good mic if the application merits it.
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Old 08-04-2008, 02:04 PM
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Is Plastigauge good.

after buying bearings one time and second guessing , i measure with micrometers from now on .
man boxed bearings , i got std bearings on two mains and the rest where .010 like i needed .guess i was a prank played buy a employee
at factory .
never believe there the size you need , always double check each one .
and as for plastic Gage , it can be to dry from parts house hanging on for to long .
can be a mess to remove also .

mic it or hold it to the floor till you hear or find the problamo .
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Old 08-04-2008, 02:46 PM
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Millions of engines are built using it. It works well.

For the purest machinist with known dead on mikes, most don't like it, but for the rest of us guys, I don't see any problems.
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Old 08-04-2008, 08:08 PM
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A lot of my coustomers have check my work with it for years and no issues so far, It sure won't get you to the tenths but for checking it should be fine.

Make sure its new plastigauge and not hold.

For a of wax string its pretty simple how it works and its been around for years.

PS I have seen guys try to use the cheap bore gauges to check clearances (the ones with the ridgid fingers) and they are good for measuring round holes and not with bearings with eccentricity built into them as I have proved that many times to some local guys and in that case plastigauge is more accurate.

We use all Sunnen bore gauges at our shops with the proper setteing fixtures.
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