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| | | Forums66 Topics128,081 Posts1,056,073 Members48,434 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down
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| | | | Joined: Apr 2005 Posts: 1,107 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 1,107 | i have a 4 lb cap on my 270 thats in the ashton and 235 thats in the 6100. the rad on the 40 is atmospheric so it doesnt matter what cap you put on it it aint gonna blow nor raise the boiling point. a five psi cap will allow it to reach 224 degrees. since i dont have my steam tables in front of me i cant tell you what 4 psi is. a seven pound cap will put you to 235 degrees. | | |
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