I feel over cammed, 230/240 on a 406.

230/236 on a 383 hmmmm...


I heard extrude hone's function is to smooth, I call around here and they said no significant amount of material is removed, a different approach, but aerodynamics related I presume.

No Siamese? I heard that was the ticket or maybe not....

Dr J out here in Orange Ca. welds material on to the base to re-contour the attack angle

so frankly there are 3 or more ways to do up a super ram, frankly is it worth the time and money for what gains?

my guess the bigger the motor or the more you want to wind it the better flowing it needs to be

 

There is some similarity. Changing intake runner diameter and length can change where the power band lands. In that regard, you could compare it to a cam change. But, don't consider it the same. Cams have more variables. They control both intake and exhaust events. Intakes don't.

There's probably no downside with your 383/AFR/auto combo. (Wait! You'll want to run it into the higher rpms even more often! Could that require even more spring swaps? )

IIRC, the Atari tach can be off if the tach filter is missing or malfunctioning. You might check for it's presence (or replace it) if you want a better reading.

 

When an intake is extrude honed, it can be opened up as much as you want until it bleeds out a hole in the port. They just keep gushing the gunk back and forth as much as necessary to reach the desired opening. It allows the manifold to be opened up in the middle of the runners where it is hard to reach with a grinder. You are right though, it does leave it with a mirror finish. Willie

 

Your runners and base can be increased 10-15% with honing. The cost is $800ish.

Many don't consider this cost effective when you can swap to a miniram (or FIRST) to get a HP (or TQ) increase without spending much extra. (The assumption would be you'd trade/sell your SR with very much lower net out-of-pocket.

FWIW, the FIRST has that better "attack-angle" Dr. J refers to.

 

Dont think you need to do all that science project cut and weld to make it work good. If you have the time and funds it can be fun to play with but an agressive port job will wake it up imo. Thing is you can only get the runners so big especially where it goes into the base, have to make it seal too.

 

so can I have someone slap these in a call it a day?

so would these eliminate my need to buy new springs?


http://www.airflowresearch.com/index.php?cPath=75