RHS flow #'s

highwaystar said
How does the Edelbrock heads compare out of the box? I also understand you are lucky if you can truly bolt on a set of these, without doing some work to them.
T.J.

OOTB Edelbrock head on my bench with 4.030 bore:

lift int. ex.
100 64 49
200 123 99
300 174 130
400 222 152
500 239 167
550 244 170
No pipe on ex. on this test.

Mild port on Eddy heads with 2.055 valves:

lift int. ex.
100 72 63
200 148 115
300 201 147
400 246 174
500 266 194
550 272 202
1 3/4 pipe used in this test.
Brian