[afterburn 549]

That is the most interesting part
DM 530 cam
I have run this cam with my port job for a few years.
It pulled hard!
I know better than using a high RPM race grind and I guess I could move up a little but with that, of course, the engine loses at the bottom.

Then I wanted to go rollers with proper geometry. (less parasitical)
So my friends in portland raised the intakes 1/2 inch up, did the geometry for the lift, and stuck in larger valves.
And then their port secrets.
Not necessarily in that order.

One would think it would not make that much difference.....it would not even idle with my moded CV.

It would fart, gasp, snort, go lean and die.
Yes, hours looking for air leaks and tank venting problems.
none.
I could keep it running at a higher idle but no idle.

*I did know what was happening.
With everything improved, it now was really feeling the overlap a lot.
After some research, I thought I would try the HSR42 I still had in a box I had tried a few years ago.
I did not like it then not so sure I like it now, but the biotch now runs.

A Couple more week it will get on the dyno and see what it does compared to last time






* with a CV the throttle plate needs to be drilled for larger LSA *