I'm in the process of putting together a 312 with an Isky E4 cam that I thought I would advance 2-4 degrees to improve low end grunt. Will slotting the B intake help me any more on low end?  Dave

SE Wis

The overall torque will be improved by slotting the manifold but that improvement will only show up after 3000 rpms.  If you’re upgrading the camshaft, you’ll still want to slot the intake regardless of the slight dip in torque that will occur at 2000-2500  rpms as a result of slotting the manifold.

Lorena, Texas (South of Waco)

Here are charts showing horsepower and torque using the ECZ-A intake with different carbs.  It still boils down to fuel metering and not necessarily the carburetor size.  But for all intent and purposes, all three carbs are reasonably close to each other on the ECZ-A’ intake manifold.  And when considering that there is ~55 years between the Lincoln Teapot and the 750HP Holley, the Teapot holds it own quite well on the ‘A’ manifold.  We’ll see what happens though when the Lincoln Teapot is matched up to the ECZ-B intake shortly.

Horsepower – ECZ-A Intake with various carbs
Rpm	Lincoln Teapot	600 Holley vac sec	750HP Holley vac sec
2500	141	144	147
3000	184	182	185
3500	213	204	211
4000	227	215	228
4500	237	233	238
5000	236	237	240

Torque lbs/ft – ECZ-A Intake with various carbs
Rpm	Lincoln Teapot	600 Holley vac sec	750HP Holley vac sec
2500	296	303	309
3000	323	318	324
3500	319	307	317
4000	299	283	299
4500	277	271	278
5000	248	249	257

 

Lorena, Texas (South of Waco)

Thanks for the info Ted.  Dave

SE Wis

Ted, this info is great. Thanks for sharing it with everyone.

~DJ~ AKA "Bleach"
1956 Ford Fairlane Town Sedan 30K original miles