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**The Rocknrod** · 05-20-2020, 08:46 PM

Dont know, I think 1/4"-20. But here is a great thread on the subject:
http://67-72chevytrucks.com/vboard/s...d.php?t=488618

05-20-2020, 08:46 PM	#2
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: Quick Question...Heater Box Dont know, I think 1/4"-20. But here is a great thread on the subject: http://67-72chevytrucks.com/vboard/s...d.php?t=488618 __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?