while this was interesting it shows the tunnel ram having a minor boost in only higher rpm power over the cross ram
its been my experience that the cross ram almost always has marginally better torque from about 3400rpm through about 5700 rpm, above about 5800 rpm there's always a bit better power from a properly tuned tunnel ram, but keep in mind the cross ram intakes designed for road racing trans-am camaros where the cars engine must provide power over a wide rpm band, and the tunnel rams almost exclusively used only for wide open throttle drag racing use.
its been my experience that the properly tuned cross ram like the edelbrock or offenhauser makes for a much faster car if you use the car for street strip and daily driving, plus you don't need to have a set of carbs sticking through the hood with a cross ram on many SBC cars
BTW the CRANE 110921 or similar cam used with 1.6:1 roller rockers in a 10.5:1 compression 377-406 SBC with the cross ram intakes
and decent heads, with 195cc- 200cc ports , properly geared have proven to be winners on the track
early 302cubic inch Z28 camaros came with an OPTIONAL extra cost ,dual quad cross ram intake in the trunk,
Ive worked on several in the past and significant power gains could be had, swapping to a cam similar to,
a crane 110921 solid lifter cam,
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especially in a larger displacement 11:1 compression engine ,
which was very commonly done, and I built several 377-406 SBC with the cross ram intakes ,
4.11:1 rear gears and muncie 4 speeds, headers etc. which really made the camaros noticeably faster
two 650 cfm carbs (ideally double accelerator pump versions work well)
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