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Is it Metric or SAE guessing game #5402971 04/14/20 12:32 PM
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Chris142 Offline OP
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Today I have an 84 Chevy G-30 Van with a 350 in for a Water Pump and Thermostat. Pretty easy job really. Except that this era of GM cars and trucks had a hodge podge of Fastners. Some are 3/8 threads with a 9/16 head. Others are a 3/8 thread but with a 15mm head and others are pure metric. Those of you that were not around when these were popular do not know what you are missing.


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Re: Is it Metric or SAE guessing game [Re: Chris142] #5403002 04/14/20 01:02 PM
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brages Offline
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get some metrinch sockets!

Re: Is it Metric or SAE guessing game [Re: Chris142] #5403011 04/14/20 01:14 PM
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Originally Posted by Chris142
Others are a 3/8 thread but with a 15mm head.....


Why ??? Who 'designed' that and for what reason ? Honestly though, when you're working on something and primarily removing and replacing fasteners, you don't really get concerned with the threads themself.

Re: Is it Metric or SAE guessing game [Re: hallstevenson] #5403033 04/14/20 01:35 PM
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Chris142 Offline OP
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Originally Posted by hallstevenson
Originally Posted by Chris142
Others are a 3/8 thread but with a 15mm head.....


Why ??? Who 'designed' that and for what reason ? Honestly though, when you're working on something and primarily removing and replacing fasteners, you don't really get concerned with the threads themself.

Someone @ GM.. Most of the bolts that hold brackets and such on are 15mm heads. The engine block and heads were still sae. I can't explain more lol


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Re: Is it Metric or SAE guessing game [Re: Chris142] #5403034 04/14/20 01:37 PM
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spasm3 Offline
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Early 80's had some weird mixes, i guess from different suppliers. Engine bolts that were sae, and body and accessory bolts that were metric.


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Re: Is it Metric or SAE guessing game [Re: Chris142] #5403038 04/14/20 01:41 PM
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Originally Posted by Chris142
Today I have an 84 Chevy G-30 Van with a 350 in for a Water Pump and Thermostat. Pretty easy job really. Except that this era of GM cars and trucks had a hodge podge of Fastners. Some are 3/8 threads with a 9/16 head. Others are a 3/8 thread but with a 15mm head and others are pure metric. Those of you that were not around when these were popular do not know what you are missing.

I can relate, my 83 Silverado with the 305 has the same mismash of sizes, nothing more frustrating than going thru my socket drawer looking for that [censored] metric socket. now i have separate drawers in my tool box for sae and metric tools. cheers

Re: Is it Metric or SAE guessing game [Re: Chris142] #5403046 04/14/20 01:46 PM
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Had a 91 Chevy Corsica so I know what you're talking about. with the exception of oil changes, I always had both metric and SAE out when working on it.


2015 Grand Caravan 3.6L - 35k miles.
2006 Mazda 3 2.0L - 186k miles
Re: Is it Metric or SAE guessing game [Re: Chris142] #5403059 04/14/20 01:57 PM
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"This'll be a ____ up for 20 years." (attributed to a wise man)

Re: Is it Metric or SAE guessing game [Re: Chris142] #5403082 04/14/20 02:22 PM
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I remember similar fun when I owned a ‘98 Cherokee.


"Think of all the Ford owners who will someday want an automobile." John Dodge

Re: Is it Metric or SAE guessing game [Re: Chris142] #5403087 04/14/20 02:25 PM
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I changed out the master cylinder in a Mercury Sable back in the 90s. There were 4 bolts on it. All 4 were different sizes. 10mm, 12mm, 3/8, and 1/2. Looked like any of the 4 would be sufficient for the job.


Without data you're just another person with an opinion. W. E. Deming


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Re: Is it Metric or SAE guessing game [Re: Chris142] #5403107 04/14/20 02:44 PM
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Same issue on my 94 Camaro. Made even worse with all the modifications I have on it.

Although my 89 Camaro is almost entirely SAE. There are only a couple things that are metric on that car.


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1994 Chevy Camaro Z28 5.7
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Re: Is it Metric or SAE guessing game [Re: Chris142] #5403117 04/14/20 02:53 PM
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Didn't many GM automatic transmissions like the 700R4... go metric in the 80's and have METRIC stamped on the pan?


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The rude guy that points out reality


Re: Is it Metric or SAE guessing game [Re: Chris142] #5403121 04/14/20 02:59 PM
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My buddy's late 80s Buick sedan came from the factory with 'METRIC ' stamped into the oil pan in 2 inch high letters so that you'd see it when it was up on a lift.

Re: Is it Metric or SAE guessing game [Re: Chris142] #5403131 04/14/20 03:14 PM
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My folks '83 Monte Carlo with the Buick V6 was a mix.
Only things besides services were the original radiator (too small) and 1 window regulator.

Not a bad car actually.


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Re: Is it Metric or SAE guessing game [Re: Chris142] #5403186 04/14/20 03:52 PM
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Our '89 Olds 98 Touring Sedan was a mix. That was my first experience with metric and SAE in one vehicle. Now I get to deal with stupidly light metric nuts and bolts mixed with random inside-out Torx and spline drive things that BMW and Audi ownership brings to the table.


'06 Infiniti G35 Sedan 6MT - 180k
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