I would be curious to see the difference when/if you put the iron intake and q-jet back on. You would think the guy who put the RPM on saw some improvement, or at least equal performance?
So, unless there was a cam change at the same time, peak horsepower for that engine is at 4,600 RPM. That intake likely improves performance higher up in the rpm range, but that engine doesn't have the camshft to get there.
1968 400 Coupe, verdoro green, black vinyl top, auto 1969 GTO Judge coupe, Carousel Red, manual 1971 Trans Am, cameo white, auto 1970 Buick Skylark Custom Convertible 350-4(driver), Fire Red, white top, auto 1972 Buick GS Stage 1, Royal Blue, black vinyl top, auto
