Rear intake coolant bypass
In this intakes example, a Holley Street Dominator, there is a plugged water port at the rear where you can plumb water from the rear of the heads into the under the plenum water passage under the intake. (Same for the MP-M1-single plane. Noted by MP as a street strip manifold because of the ability to introduce heat into the intake for double duty/all weather driving)
Minor grinding under the T stat to open up the water passage in full would need to be done. Or close it off for no water heat under the carb.
Bottom picture is the MP-M1 single plane with a shot of the water passage (same as the Holley Street Dominator) that would need to be modified. Cut and closed off for no heat or cut wide open for max water flow and manifold heat under the carb. This water passage is not on the Holley Strip Dominator or the MP-M1-RACE intake manifolds.
In this intakes example, a Holley Street Dominator, there is a plugged water port at the rear where you can plumb water from the rear of the heads into the under the plenum water passage under the intake. (Same for the MP-M1-single plane. Noted by MP as a street strip manifold because of the ability to introduce heat into the intake for double duty/all weather driving)
Minor grinding under the T stat to open up the water passage in full would need to be done. Or close it off for no water heat under the carb.
Bottom picture is the MP-M1 single plane with a shot of the water passage (same as the Holley Street Dominator) that would need to be modified. Cut and closed off for no heat or cut wide open for max water flow and manifold heat under the carb. This water passage is not on the Holley Strip Dominator or the MP-M1-RACE intake manifolds.