 62BillT
"23rd Year" Silver Supporting Member
Posts: 6135
Loc: Moneta, VA
Reg: 09-24-01
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01-14-25 08:53 AM - Post#2877079
Looking to buy a new Compression Tester and need to know the Spark Plug Thread Sizes for our old Small Block Chevys, Large Plug for the '60's Engines and Small Plugs for the '70's.
Thanks
Member:
-National Impala Association
-Vintage Chevrolet Club of America
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gcrkfrd
"7th Year" Platinum Supporting Member
Posts: 542
Age: 78
Loc: Neosho, MO.
Reg: 04-01-18
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01-14-25 08:37 PM - Post#2877103
In response to 62BillT
Everything I own uses 14mm, 283, 327, 305, 350, 4.3, 235.
Any Gauge set you buy, should have that fitting.
1952 Styleline Sedan-62 235 PG
1967 C-20-2wd 327
1985 GMC 1500-2wd 4.3
The only running vehicles I own. |
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Rick_L
Member #409
Posts: 28125
Loc: Katy, Tx, USA
Reg: 07-06-00
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01-15-25 06:49 PM - Post#2877113
In response to gcrkfrd
Chevy engines are 14mm, 1.25 pitch. The only variation you’ll see is the reach (thread length), and whether the threads seal with a gasket or a tapered seat.
A compression tester or leak down tester will have a short reach and a soft o-ring seal that’s universal for any 14 mm plug thread.
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62BillT
"23rd Year" Silver Supporting Member
Posts: 6135
Loc: Moneta, VA
Reg: 09-24-01
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01-31-25 06:04 AM - Post#2877528
In response to Rick_L
Appreciate the replies.
Member:
-National Impala Association
-Vintage Chevrolet Club of America
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