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1990 Ford Mustang LX 351M powered!! Project Cherry Bomb!!
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Discussion Starter · #1 ·
Sooo, I finally took the bite and started getting a set of SCJ heads, have to get em 1 at a time $$$ allowing, and I have an issue. I have a Performer RPM intake manifold that I want to port match to the heads..... There's the problem.....
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The gasket I'm using in the pic is a 1231 Felpro, it's the one recommended for a SCJ head, and I've matched it up with the head, but I'm not sure about removing that much material on the intake. The scribe lines on the intake are from a 1230 gasket. I was gnna use that before I made the decision to get the SCJ heads... If it's relevant the cam I'm planning on will be in the .560 to .580 lift range. Any other information needed or pics needed just ask. I'm not going forward with any mods to the intake till I get a consensus from the forum. Thanks for your time and consideration..
 

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Being a mild build i would just match the 1230 gasket and blend in the sides and roof about 2 inch's in and call it good. I'm no porter so just wait for the "GURU" AKA as the MAD PORTER to tell you what is best.

His probably ported more intake's than i've had hot dinner's.......:D

Cheers, Bob
 

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In my limited understanding a perfect port match in this case isn't going to net big gains. best to wait for mad porter to weight in.
 
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1990 Ford Mustang LX 351M powered!! Project Cherry Bomb!!
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765 Posts
Discussion Starter · #4 ·
That's me, I don't know enough aboot it to be able to tell if it would be worth it? Doing it 1/2 way? If the upper side really needs it? That's why I presented it here..
 

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The level of modification to the runner exits is based on displacement, cam timing, expected output and intended use.








Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine
 

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1990 Ford Mustang LX 351M powered!! Project Cherry Bomb!!
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765 Posts
Discussion Starter · #6 · (Edited)
Stock bore and stroke, 276-284 lift split is what I was looking at, ( Lunati 10340704LK), around 500-550 hsprs, and street-strip use in a 90 LX Mustang, using a 97 460 short block as the basis for my build, (will be going thru it and specing it out as best as I possibly can I realize imma have to flycut the pistons) good kind sir.. any and all suggestions are appreciated!!
 

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With intake valves back cut your combo will make about 510 ish HP.

The intake is adequate as is. If you turn up the wick with ported heads and want to bias the combo to the hp peak you raise the roof to 1/8" shy of the CJ roof and match the walls to the std gasket NOT THE CJ.

The manifold pictured is on my LTD and was very carefully ported to equalize air flow port to port when the intake was attached to the fully ported SCJ's. That level of detail is very costly.

On smaller 429's and mild 460's 1-3-6-and 8 offer good results. The remaining ports when ported can hurt low end.
Larger more aggressive combinations can benefit from the others.

The RPM air gap has a bit more port cross section from the plenum vs. the rpm.

These dual planes are good to 600+ hp non ported and maybe another 50 ported.
At that point a transition to the T2 or a Victor is in order.

If you are after peak hp only and MPH at the track then the stealth is a good fit. Part throttle manners are less than ideal.








Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
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1990 Ford Mustang LX 351M powered!! Project Cherry Bomb!!
Joined
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765 Posts
Discussion Starter · #8 ·
Thanks a bunch!!! You've given me the guidance I was looking for!! Hats off to ya sir! You are a gentleman and a scholar!!
 

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Thanks a bunch!!! You've given me the guidance I was looking for!! Hats off to ya sir! You are a gentleman and a scholar!!

Actually I am kind of a dick but I hide it well.
Or so I'm told. :oops:






Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine
 
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