More air
The next step to free up the big 351 cleveland is to convert it from the factory 2 barrel motorcraft 2100 2 barrel carburettor to a 4 barrel 4300 series carburettor.
Here is the standard H code 2 barrel 2100 series carb.
The factory small port 2 dot heads are more then good enough for what I need and tests prove that for street performance the small ports heads flow more then enough. The large port 4 dot heads were more for high performance race situations.
In order to complete the conversion, I had 3 options in terms of inlet manifold to match the small port heads. Option 1 was to source an Australian cast (in 1973) 4 barrel small port square bore inlet manifold, option 2 was the similar small port spread more manifold cast in Australia in 1976, and then finally option 3 to source an after market manifold.
As I wanted to maintain a stock look, I managed to source a small port 1973 aussie cast manifold from late XA / early XB GT falcons. Most were going for more than $700 on ebay and facebook. While the spread bore units are easy to obtain and cheap. I managed to find the 1973 square more version locally for $100.. A real bargain.
The first step was to sand blast the manifold to clean up all the old paint.
