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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Mar 2013 Posts: 26 New Guy | | New Guy Joined: Mar 2013 Posts: 26 | What are the considerations of replacing my single barrel carb with a double on my 53 1/2 ton? Thanks! | | | | | Joined: Aug 2012 Posts: 566 Shop Shark | | Shop Shark Joined: Aug 2012 Posts: 566 | http://stoveboltengineco.com/2012/07/proper-carburation-2/This is what i know about changing the manifold to a 2X1 Fenton intake on a 1956 235 Chevy. If you have the by pass oil filter housing you will need to make a bracket or relocate it if you use the Fenton intake. I am not sure about the other intake manifolds. You will also need to heat the intake by water or exhaust heat.
"As I lay rubber down the street, I pray for traction I can keep, but if I spin and begin to slide, please dear God protect my sweet ride." -Amen 56 Chevy 3100 | | | | | Joined: Feb 2000 Posts: 5,200 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 5,200 | If you are talking about a 2 barrel carb on a one barrel intake, then little if or no gain will be had. The intake hole size will limit what gets through. I have seen the manifolds milled out to accept the Rochester 2GC carbs will good results, but I haven't heard anything good about the adapters being used.
Joe | | | | | Joined: Nov 2002 Posts: 2,763 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,763 | To echo Joe's comments above (if you are talking about replacing a single barrel carb with a two barrel carb and using the stock manifold and adapter):
We did a lot of testing years ago. We were not able to duplicate the performance of the original single barrel using ANY two barrel with the 2 -> 1 adapter.
We did no testing by milling out the manifold as Joe suggested, so have no comment there; but using the two barrel and adapter WITHOUT manifold modifications LOST performance (at least in ALL of our testing).
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | | | | Joined: Mar 2013 Posts: 26 New Guy | | New Guy Joined: Mar 2013 Posts: 26 | Thanks everyone. What is the best source for buying a rebuilt carb for the 216? | | |
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