Heat Riser concern - The 1947 - Present Chevrolet & GMC Truck Message Board Network

davepl · 06-23-2016, 03:20 PM

I'm a little worried about my heat riser on my stock 402 because it stays closed mostly at idle.

It's still spring loaded and operates freely. But at hot idle it's still forcing a lot of the heat through the manifold crossover, and most of the exhaust flow comes out the driver's side pipe only.

How normal is is that?

I also have some overheating at idle issues and I wonder if its not aggravating that a little bit.

My question is how important is the heat crossover in the summer time? Could I just wire it open or would I lose driveability during the warmup phase?

06-23-2016, 03:20 PM	#1
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Heat Riser concern I'm a little worried about my heat riser on my stock 402 because it stays closed mostly at idle. It's still spring loaded and operates freely. But at hot idle it's still forcing a lot of the heat through the manifold crossover, and most of the exhaust flow comes out the driver's side pipe only. How normal is is that? I also have some overheating at idle issues and I wonder if its not aggravating that a little bit. My question is how important is the heat crossover in the summer time? Could I just wire it open or would I lose driveability during the warmup phase? __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible



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