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Joined: Aug 2002
Posts: 410
Backyard Mechanic
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OP
Backyard Mechanic
Joined: Aug 2002
Posts: 410 |
I ran a search on this , but did not find any info.. My thread pitch gauge shows 12 threads per inch on the head bolts is this correct?
Cleon
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Joined: Jun 2002
Posts: 29
Grease Monkey
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Grease Monkey
Joined: Jun 2002
Posts: 29 |
You can buy the proper bolts and tap from The Filling Station in Lebanon OR.
Don C #14476 VCCA
DonC
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Joined: Jan 2002
Posts: 242 Likes: 1
Backyard Mechanic
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Backyard Mechanic
Joined: Jan 2002
Posts: 242 Likes: 1 |
Yes Cleon thats right (british) .
Jim
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Joined: May 2002
Posts: 1,213 Likes: 1
ChatMaster - 1,000
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ChatMaster - 1,000
Joined: May 2002
Posts: 1,213 Likes: 1 |
According to my 1940 4 Cyl Master parts book,the head bolts are 1/2" X 12 U.S.S.Whilst they may appear to be 1/2" Whitworth thread(English thread,55 degree thread form angle),they are a special American thread form.They still have the 12 threads per inch the same as the English Whitworth,but the thread form angle is 60 degrees. 
CJP'S 29
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Joined: Aug 2002
Posts: 410
Backyard Mechanic
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OP
Backyard Mechanic
Joined: Aug 2002
Posts: 410 |
Thank You for the information 625jim and cjp'29.
Cleon
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Joined: Dec 2001
Posts: 10,379 Likes: 1
Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
I have tested the new head bolts that are sold by the Filling Station. They are exact as the original bolts. Although they are the same length as the originals they should have been made 1/4 inch longer. When using these new headbolts (or any headbolt) make sure the holes in the block are cleaned thoroughly. Dig out any debris and blow out with an air hose. You can use more torque on these new headbolts. I suggest 65 pounds. Although you could use more, it could result in a damaged block.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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