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Beuford · 05-02-2011, 04:11 PM

I've never had a problem with a 400 if everything is good.I run a 400 with a comp cams EX250-H cam speed Pro 9.5:1 pistons. I do have 76cc heads that I drilled myself and I run a 4 row Desert Cooler and a 160 thermostat and a Summit Hi flow water pump. I towed a 6500 lb trailer out west last June and July and even in the Mts I had no trouble staying below 210 deg. I have a 5 spd NV3500 and 4:10 rear gear. Towing should be no problem.

05-02-2011, 04:11 PM	#8
Beuford Registered User Join Date: Oct 2009 Location: Townville,Pa Posts: 284	Re: Chevy 400 sb cooling headaches I've never had a problem with a 400 if everything is good.I run a 400 with a comp cams EX250-H cam speed Pro 9.5:1 pistons. I do have 76cc heads that I drilled myself and I run a 4 row Desert Cooler and a 160 thermostat and a Summit Hi flow water pump. I towed a 6500 lb trailer out west last June and July and even in the Mts I had no trouble staying below 210 deg. I have a 5 spd NV3500 and 4:10 rear gear. Towing should be no problem.