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Jim Caughlin · 05-19-2021, 12:46 PM

I recall someone doing some dyno testing using a Stock legal Holley (in other words, choke plate and horn intact) to see how close the underside of the hood in relation to the top of the choke horn would be. They mounted a chunk of plywood over the dyno and did pulls at various heights to see at what point there was a performance drop off. The magic number turned out to be 2".

Jim Caughlin
SS 6019

05-19-2021, 12:46 PM	#2
Jim Caughlin Senior Member Join Date: Mar 2002 Location: Woodburn, Or Posts: 685 Likes: 83 Liked 805 Times in 245 Posts	Re: Carb to hood spacing I recall someone doing some dyno testing using a Stock legal Holley (in other words, choke plate and horn intact) to see how close the underside of the hood in relation to the top of the choke horn would be. They mounted a chunk of plywood over the dyno and did pulls at various heights to see at what point there was a performance drop off. The magic number turned out to be 2". Jim Caughlin SS 6019