My 4x4
Post Fiend
Joined: Jul 2006
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Where did you find headers that fit a truck application and had the same pattern that you required? Port location is dofferent on these heads and since you were talking about making more power, I believe that you have left some performance on the table using these in this application.
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Where did you find headers that fit a truck application and had the same pattern that you required? Port location is dofferent on these heads and since you were talking about making more power, I believe that you have left some performance on the table using these in this application.
Post Fiend
Joined: Jul 2006
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There is some power left on the table because of the port size. You have noticed the differences in sizes, and acknowledged that you had not match ported yet, so there is some power on the table, most are not aware of the exhaust port location difference between the std FE heads and some of the more desirable heads, and especially the more rare heads.
While your set up runs, and will run, it wont run to its full potential, unless you have this thing in the 6K rpm range all of the time, and even then it is not optimum because the air become turbulent and simply cant flow with a restriction. The exhaust port difference is almost .250". This is a fair amount of obstruction.
I do not even know which set of heads you have, so this is all speculation, but I do remember the mention of more power, and more power is right there.
While your set up runs, and will run, it wont run to its full potential, unless you have this thing in the 6K rpm range all of the time, and even then it is not optimum because the air become turbulent and simply cant flow with a restriction. The exhaust port difference is almost .250". This is a fair amount of obstruction.
I do not even know which set of heads you have, so this is all speculation, but I do remember the mention of more power, and more power is right there.
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So all I have to do is port the ports on the intake right? With the headers, the ehaust ports and the headers match up really close. but the intake ports on the intake are atleast a quarter inch smaller than the intake ports on the heads. So how much more power do you think that would add?
Post Fiend
Joined: Jul 2006
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This is a double edged sword here, because the larger port generally slows air speed and velocity, so throttle response and low rpm suffers. That being said, opening any ports further can exadurate this problem.
DO you have a casting number for the heads that you actually have? I only know them as a 14 Bolt exhaust, and this covers several. Some were better than others.
Either way, a decent match port should always be done, without making the intake port on the head any larger unless it is valuable to increase its size.
DO you have a casting number for the heads that you actually have? I only know them as a 14 Bolt exhaust, and this covers several. Some were better than others.
Either way, a decent match port should always be done, without making the intake port on the head any larger unless it is valuable to increase its size.
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Joined: Aug 2008
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From: Olympia
I rarely go off-roading, if I do, it's just down a low maintenance road or in a plowed field, no jumps, no bumps, no stumps. It's more for driving through town and lookin good, I hate cleanin it and stuff breaks so much easier if you go mudding a lot. But about the headers, I got some exhaust yesterday and now I can here a few header leaks so when I'm bored I got to snug up the bolts, I got 14 bolt heads so it takes awhile.
Its a good looking truck all-in-all. I had my truck running straight out of the manifolds, (not driving it around obviously) because my new high torque starter gets in the way of things.
It sounded decent, but as soon as I got my pipe bolted back up it sounds so much better. (No mufflers or anything atm.)
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From: North Dakota
What size of carb are you running? I've talked to a guy in town here that builds FE motors, one of his cars puts around 800 hp to the ground. I dont know what size he was running, but he wanted to put a 900 or 950 cfm on my 351M. he said most people run too small of carbs on FEs, 351M/400, and 351Cs.
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The heads I have are C6AE-8090R, I think thats the right one?
Prozon- and oh its not too shiny haha, i just got to keep it clean so she doesn't rust away
hav24wheel- I'm running a holley 4160, 750 double pumper so I think i'm gettin enough fuel, it goes through a tank to fast i hope i dont need bigger haha. But yeah i hear it all the time that people with FE's that they shouldn't go much over 600 or 650cfm.
Prozon- and oh its not too shiny haha, i just got to keep it clean so she doesn't rust away
hav24wheel- I'm running a holley 4160, 750 double pumper so I think i'm gettin enough fuel, it goes through a tank to fast i hope i dont need bigger haha. But yeah i hear it all the time that people with FE's that they shouldn't go much over 600 or 650cfm.
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Thread Starter
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This is a double edged sword here, because the larger port generally slows air speed and velocity, so throttle response and low rpm suffers. That being said, opening any ports further can exadurate this problem.
DO you have a casting number for the heads that you actually have? I only know them as a 14 Bolt exhaust, and this covers several. Some were better than others.
Either way, a decent match port should always be done, without making the intake port on the head any larger unless it is valuable to increase its size.
DO you have a casting number for the heads that you actually have? I only know them as a 14 Bolt exhaust, and this covers several. Some were better than others.
Either way, a decent match port should always be done, without making the intake port on the head any larger unless it is valuable to increase its size.
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yeah, i thought 14 cuz that was what the first set was, than we bought another set, so being the CJ, i'm assuming much better right?
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