Ford 4V vs 2V Heads
4V vs 2V Ford Cylinder Heads:
Sanderson headers for the Ford 351C, 351M, and 400 engines feature flanges for the larger port four-barrel (4V) cylinder heads. If using two-barrel (2V) cylinder heads, Sanderson part #2BBLFC copper adapter plates are required to ensure proper sealing.
When installing Sanderson headers with the 2BBLFC adapters, we recommended this installation procedure:
- Follow the standard installation instructions on our website, which describe a thin “smear” of silicone gasket maker around the exhaust ports on the header flange. This will contact the adapter plate.
- Then, a thin smear of silicone gasket maker is applied on the opposite side of the adapter plate, which will contact the cylinder head.
- Let the silicone fully dry overnight.
- Install the headers and the adapter plates onto the cylinder heads.
- Run the engine long enough to reach normal operating temperature for a few minutes.
- Let the engine cool and re-tighten the header bolts.
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