350/360/330 SBC with Edelbrock heads

[Bob Mulry]

I'm an Old Guy, so help me out....

I looked up the e-Brock specs on these NHRA replacement heads.

I found that 3 of the part numbers had Intake Runner Volumes of 185cc..

I found that 1 of the part numbers had an Intake Runner Volume of 170cc.

I noticed that in the tech specs that the Intake Runner Volume of all of the Factory Cast Iron Heads have an Intake Runner Volume of 165cc..

The e-Brock heads I believe are SS only because they would have to be filled and ported out to size, which is legal in SS but not in Stock.

What did I miss??????

Thanx.