Edelbrock 2x4 on a 348

Henry

Member
I have a 1961 Chevy Biscayne 2dr. with a 350 horse 348, which means it has 3781147 heads, and tri power.
I want to put an Edelbrock 2x4 set on it. Are the ports on these heads considered small port or large port?
 

boxerdog

Well Known Member
Supporting Member 5
Offy makes a small port 2x4 manifold also, in standard and tall versions. I have no idea which one might work the best, I bought my Offy before the Eddys came out and felt like it needed work inside. Others may chime in on this, hopefully.
 

Don Jacks

Well Seasoned Member
Supporting Member 3
I believe the Edelbrock is better being a newer more modern design,but the Offy is decent.I doubt that,given that tiny "old tech" cam,that there's much difference between the two
 

rstreet

Well Known Member
Supporting Member 17
1F85B883-CB7F-4F94-9CC5-14E22C449EC3.jpeg 722DEA35-5B14-4996-A67A-D95937A88B6F.jpeg 38B04311-61A9-41B2-9D3E-A5C7617E5A19.jpeg I also have a 2X 4 Offy manifold on a 61-348 small head. I like how mine starts and drives even with the cast iron cased powerglide. It takes quite a bit of tuning to get it that way but the old eldebrock tuning guide worked great. I believe my final setup was their minus 2. No chokes either! Twin 500 cfm carbs but I had to use low profile manifold and thin phenolic spacers due to heat and vapor lock
Robert
 

models916

Well Known Member
Supporting Member 7
The Offy will run better than the Eddy with a 3:70 or better gear. 360 design likes RPM. For the street, Eddy is probably the way to go. I run a 4:56 with my 2" spacer, tall Offy.
 
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