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Ralph A Powell · 11-17-2021, 09:11 AM

As I remember the diameter of the fuel passage in the old blue Holley regulator is only .224. When I was doing some development work on the first annular 4500 hundreds the Holley engineers told us that the cross over for a second regulator was 580hp. The old blues were very smooth operating regulator’s.

11-17-2021, 09:11 AM	#22
Ralph A Powell Member Join Date: Oct 2017 Location: Bay City Texas Posts: 387 Likes: 2 Liked 225 Times in 136 Posts	Re: Electric Fuel Pumps... As I remember the diameter of the fuel passage in the old blue Holley regulator is only .224. When I was doing some development work on the first annular 4500 hundreds the Holley engineers told us that the cross over for a second regulator was 580hp. The old blues were very smooth operating regulator’s.