Possibly a little.
The 30hp from the 650-2bbl was actually more of an improvement than we expected.
That’s the only motor we tried it on.
Several years later, when the 360’s/350’s/351’s were what was being run in that class, and the Chevies were running the Vortec heads........
a really good 355 Chevy Vortec combo would pick up 40-50hp from the 4412 to a good 4bbl.
One that didn’t use all the good stuff...... which could be down close to 20hp with the 2bbl....... would only gain about 30-35hp with the 4bbl swap.
