It's not the pressure from the water pump that will burst the core, it is
the static pressure buildup from the high temperature and the relief valve
on the radiator cap. 15 PSI will burst the OEM radiator on a 57 and may
possibly burst the heater core, especially if it is already weak from
previous failures. The only way to find out for sure is to take the old
core out and hydro it at 30 PSI or so. If it holds, you *should* be OK.
If it doesn't hold, well at least you found out with the core out already.
Putting a restriction in the heater line will not drop the pressure at the
core since there will be full system pressure even if flow is stopped
completely in one leg. The only way to protect the core is to block off
both hoses completely.
Bruce Kettunen
57 3200
Mt. Iron, MN
>i just like my long bed. period.
>
>on the Q-jet,. my hot air choke works perfectly, never sticks or anything
>(knock on wood) .
>
>and with the heater,. my original core did leak, i ran garden hose water
>though it and it had several holes,. i took it to a very well know local
>readiator shop, and they repaired it,. no more leaks,... BUT i have a chevy
>355 (its been bored, obviously) and 70s-80s water pump, and a Be Cool
>aluminum radiator and a 15 lbs. cap,.... will this be too much for my lil
>old core? can i just neck down to smaller tube or put some other kind of
>restriction in the feed line to reduce pressure?
>thanks.
>
>Brian M
>Atwater, CA
>'57 Chevy 3200
>'55 Chevy 6400 (comming soon)
>'00 Dodge Neon
>_________________________________________________________________________
>
>
>oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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