SBM Edelbrock/Speedmaster Head Data

polyjohn said
Wow Guys, just brilliant and very technical all at once!

The long and short of it is:-

If you haven't got a decent bench, then don't think about all out porting DOH!

There is an old adage, ''if it looks right, then it probably is right''.

Can a SM 170 head be ported to 300cfm without a degree in science?

Great work porting guys, you take my breath away with these flow numbers.:thumbsup:

On a slightly different note, are the CNC ported SM heads any good, what do they flow???

Here's how the stock SM, the CNC SM and the stock Trick Flows tested on my bench. All 2.02 valves.

Porting the SM to 270-280 is not that difficult, especially if using a 2.055 or 2.08 valve. Getting to 300 takes some work and some testing/cutting machinery.