400 small block exhaust question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

milnesmcneil · 10-31-2009, 04:54 AM

I have a 1977 scottsdale K20 4x4 with the 400 small block.

Would I have any problems installing a new 2.5 inch exhaust system using my original heat riser valve. I would like to keep the heat riser on the truck.

And what size exhaust system would you recommend 2.25 or 2.5.

Any recommendations would be greatly appreciated. Thanks for your time and help. Chuck

Prong · 10-31-2009, 05:02 AM

I had a 76 K10 with the 400 and I had a 2.25" dual setup using the factory manifolds with the heatriser and it worked just fine for me.

ont_guy_38 · 10-31-2009, 08:16 AM

you won,t have any problems with the 2.5 if thats what you decide on

milnesmcneil · 10-31-2009, 08:46 AM

Thanks for both of your responce. I wasn't for sure if the 2.5 exhaust would fit the original heat riser. Chuck

10-31-2009, 04:54 AM	#1
milnesmcneil Registered User Join Date: Oct 2009 Location: Hillsdale, MI Posts: 3	400 small block exhaust question I have a 1977 scottsdale K20 4x4 with the 400 small block. Would I have any problems installing a new 2.5 inch exhaust system using my original heat riser valve. I would like to keep the heat riser on the truck. And what size exhaust system would you recommend 2.25 or 2.5. Any recommendations would be greatly appreciated. Thanks for your time and help. Chuck

10-31-2009, 05:02 AM	#2
Prong Registered User Join Date: May 2007 Location: CO Posts: 474	Re: 400 small block exhaust question I had a 76 K10 with the 400 and I had a 2.25" dual setup using the factory manifolds with the heatriser and it worked just fine for me.

10-31-2009, 08:16 AM	#3
ont_guy_38 Registered User Join Date: Jul 2007 Location: Ontario Canada Posts: 1,006	Re: 400 small block exhaust question you won,t have any problems with the 2.5 if thats what you decide on

10-31-2009, 08:46 AM	#4
milnesmcneil Registered User Join Date: Oct 2009 Location: Hillsdale, MI Posts: 3	Re: 400 small block exhaust question Thanks for both of your responce. I wasn't for sure if the 2.5 exhaust would fit the original heat riser. Chuck



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