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I'm considering a M1 intake for my 505 ci RB engine I'm building.
Anyone running one?
The car and engine specs are as follows:

E body
2:23 gear
727 with 9.5 PTC conv. 2800 stall
Ported E heads
10.8 comp
Hyd roller 245@ .050 dur / 540 lift
Headers

The car is not a race car but will see the strip occasionally

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Are you sure the gears are 2.23 and not 3.23 The single plane intakes are normally a little lazy below 2500 RPM with a stock stroke and bore stockish type motor, with a stock converter that can be a detriment With a big inch stroker and a good converter not so much Your combination will be good either way The RPM intake will make more torque and HP below 4500 RPM than the M1 will(I've dyno tested both a on 496 C.I. RB stroker)at WOT but after that the M1 takes over all the way to 6500 RPM