Ported top end: Port Match or bolt it on...

[Schrade]

Originally Posted by LGAFF

The 90 only had ported intake and 63MM TB....I ported the airhorn, etc....doubt that mattered much.

No change in exhaust, or headers

Ok - so you got 37 additional HP - on a dyno, WITH a sharp ridge...

So, leaving a ridge perpendicular to the air flow will direct the flow colliding with that ridge to run perpendicular to the flow direction, resulting in a "standing wave"

I'm kinda' baffled on that - Paul? Chime in here?

What's the chance now Lee, that you can cut some 45' channels on that mill - even some short grooves - into the head port inlets, to break up that 'standing wave' (that I can well imagine that exists) ??? I just bet that would be 7 - 10 more HP on the dyno...

And even if you had only taper-ported the IH's, from plenum juncture, to head, would you have then gotten 37 more HP? OR MORE??? I bet so.

I sure wish some others 'in the know' would ring in on this...........

Has anyone else done plenum + IH portwork ON OTHERWISE STOCK MOTOR, and done a dyno?

Any links on LT5 portwork, with IN-DEPTH details?