Quote:
Originally Posted by GoreMaker
The EGR causes the side wall to tuck in a little bit, as can be seen on the top view picture, but the floor is actually slightly lower than non-EGR manifolds to make up for that. Actual volume remains the same, but there's slightly less room on that side between the manifold and the valley pan as a result. I compared the floor with the one on my RA-IV/HO reproduction, and this one is definitely lower than that.
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keep in mind the RA/HO repro intakes plenum floor is not as deep as GM intakes, rocky rotella measured them & showed about 1/8-3/16 less depth, i compared my 1970 iron intake to a 71 HO GM intake & the HO is not as deep, both were fully ported by SD.