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| | | Forums66 Topics128,021 Posts1,055,346 Members48,420 | | 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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| | | | Joined: Apr 2011 Posts: 16 New Guy | | New Guy Joined: Apr 2011 Posts: 16 | my 62 has a 7lb pressure cap. i installed a 383 engine and am wondering if i could go to a 13 lb cap for more efficient cooling without blowing my heater core. i had the core fixed before i started running the new engine. if anybody knows if this is safe to do let me know. i have installed a new aluminum radiator from cool craft they say 13 will be ok but they don't know if the core will stand the pressure or not. | | | | | Joined: Oct 2009 Posts: 426 Shop Shark | | Shop Shark Joined: Oct 2009 Posts: 426 | Im running a 13# cap on my aluminum rad and haven't had any problems with the heater core...ran fine for 2 years...then the core finally went, but went from age...was the original Harrison with the Ranco valve on the core. Was rebuilt about two months ago and working like a champ again. | | | | | Joined: Apr 2011 Posts: 16 New Guy | | New Guy Joined: Apr 2011 Posts: 16 | thanks for reply I'm gonna stick the 13 lb cap on and go thanks. | | | | | Joined: Jun 2005 Posts: 1,756 Shop Shark | | Shop Shark Joined: Jun 2005 Posts: 1,756 | Im running 17lb. But no heater core. | | |
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