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Discussion Starter #1
I have done searching all over the place, and of all things what I can't find is a set of flow numbers for the stock 96-98 heads - no p&p job, no PI valves... nothing. Just the way they left the factory. Can anyone provide me with them? I'm trying to compare various different configurations, and I've got most I want except this.

[rant mode] I guess all the stangers skipping over the NPI heads isn't helping, but I find it odd they can't produce flow #s for them... how do they know they're "boat anchors" if there aren't #s out for them? [/rant mode]
 

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Discussion Starter #2
Nobody has a clue? There have to be 500,000 pairs of these heads out there from the cars alone... ignoring any of the truck variations. Someone must have a decent idea....
 

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Refrigerator Raider Hater
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11,719 Posts
Yes, I've seen a chart, and I think I've even posted it once, but can't seem to find it now.

In summary....Bump.
 

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That's funny, I thought it was the 94-95 blocks that are the anchors.....

With a little help, my 96 NPI's aren't doing to bad...

But, I digress... this is a good question, maybe a more specific title like "'96 - 98 Heads -- flow numbers please?" might elicit some response... I know that someone out there knows the answer, or knows someone that does....

In short:
Bump, again
 

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High-Mileage 4.6L Thrasher
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3,232 Posts
Here you go..From MM&FF website(All they have listed is the intake side..the exhaust is almost the same as the PI-just a few cfm lower).
Stock Non-PI's
.100"=46cfm
.200"=84cfm
.300"=121cfm
.400"=147cfm
.500"=170cfm
Renegade ported Non-PI's
.100"=68cfm
.200"=120cfm
.300"=166cfm
.400"=190cfm
.500"=208cfm
.600"=220cfm
JL
 
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