porting plenum

TwoToneThunder

Registered User
i know that magnum powers sells them
but i have the stock one off my old 89 sc
i was wondering if someone ported one of these before
im gonna give it a shot and see if it makes a difference

opinions?
 
It really isn't worth the time and effort. The bottle neck in those '89 plenums are the mid-section. It bottlenecks down to somewhere around 60mm. Anything you do before and after that won't matter.

You're better off to find a stock 94/95 blower.
 
I know someone;) who went the extreme and did this

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I know someone;) who went the extreme and did this

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Being a machinist / welder, I gotta ask.....

It looks pretty good on th outside, but what about the inside?

Did you do any grinding / polishing of the welds from the inside, or does it even matter?
 
right now im going to cut the return plenum in half and try to grind out as much as possible then get it welded back together
 
on mine i cut it out weld in the fill panels from outside and get a good penetraition then grind the inside using a carbide bit i mounted on a 3.8 pushrod i mount this on a hand drill it works fast and i can get to all of the manifold ahh home made tools .

after i have it powder coated inside and out and its ready to flow.
 

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Being a machinist / welder, I gotta ask.....

It looks pretty good on th outside, but what about the inside?

Did you do any grinding / polishing of the welds from the inside, or does it even matter?
I made sure I did plenty of blending on the inside.;)
 
ive ported them but they really need to be enlarged like the one in my picture up above. in other post or here
 

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