SBM Edelbrock/Speedmaster Head Data

pittsburghracer said

Are you going to port them now.

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That is my plan. I've already done a few things to the Speedmaster head. Working on it first because it's the cheapest. The head bolt and push rod holes are tubed. I worked on the push rod pinch area on one port and gained 20 cfm @ 0.600 lift. I removed the head bolt bulge on the same port and gained 10 cfm at 0.750 lift, but lost a little at 0.600. Even after the mild porting the velocities are 320-350 around the pushrod and 340-380 over the SSR, so I know there's more work to do there.

I'm not going to touch the bowl area until I can work on the seats. Next move is to add a small 75 degree cut between the 90 and 60 degree bottom cuts. Only have a few hours here and there to work on it.

I've learned a lot from your posts and pictures. Thanks for sharing so much.