head selection
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Elder User
Joined: May 2007
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From: Sparks, NV
head selection
im looking for a fresh head from the junkyard, my dad got a valve job and i think he polished the head 100,000 miles ago (i think) on the original head, but i want to start fresh.
What is a fast-burn head? i was looking at the ford-six website (at school right now cant register atm) and the efi head has fast burn technology? wth?
What head would be a good candidate for a good bump in performance/economy?
i see the 240 head for the compression bump, but i hear the 300 head dosent even flow enough even for the engine it was designed for...
4bbl holley 390 cfm, efi or HD truck manifolds <--- my planned upgrades and maybe a cam. I wanna get some efficiency out of his thing, even though the 300 is capable of 25 mpg.
What is a fast-burn head? i was looking at the ford-six website (at school right now cant register atm) and the efi head has fast burn technology? wth?
What head would be a good candidate for a good bump in performance/economy?
i see the 240 head for the compression bump, but i hear the 300 head dosent even flow enough even for the engine it was designed for...
4bbl holley 390 cfm, efi or HD truck manifolds <--- my planned upgrades and maybe a cam. I wanna get some efficiency out of his thing, even though the 300 is capable of 25 mpg.
Posting Guru
Joined: Sep 2004
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Basically, the carb heads are open chamber, the efi are closed, to put it into a visual.
Efi head creates a little swirl to the incoming air fuel mixture, which translates to a need for less ignition timing. The intake valve is horribly shrouded due to this. For this reason, for optimal flow, its easier to just start with a carb head.
The 240 head, combustion chamber cc wise, in some cases, isnt much different from the efi 300 head.
With the carb heads you have adjustable rockers, with the efi, pedastel mount/bolt down.
The efi heads are also prone and known to crack, so if you go that route, be prepared to find a couple, as it wouldnt suprise me if your machinist finds a crack when hes checkin.
Exhaust manifolds are inexpensive but the basic long tube headers arent exactly expensive (under $150 if you look in jegs/summit), and would benefit your economy/power, not hurt it.
Build for low end torque and go with a numerically low final gear ratio and you should be set for some decent mpg, get the compression ratio up.
Efi head creates a little swirl to the incoming air fuel mixture, which translates to a need for less ignition timing. The intake valve is horribly shrouded due to this. For this reason, for optimal flow, its easier to just start with a carb head.
The 240 head, combustion chamber cc wise, in some cases, isnt much different from the efi 300 head.
With the carb heads you have adjustable rockers, with the efi, pedastel mount/bolt down.
The efi heads are also prone and known to crack, so if you go that route, be prepared to find a couple, as it wouldnt suprise me if your machinist finds a crack when hes checkin.
Exhaust manifolds are inexpensive but the basic long tube headers arent exactly expensive (under $150 if you look in jegs/summit), and would benefit your economy/power, not hurt it.
Build for low end torque and go with a numerically low final gear ratio and you should be set for some decent mpg, get the compression ratio up.
Thread Starter
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Elder User
Joined: May 2007
Posts: 548
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From: Sparks, NV
Hmm, interesting. thanks for the info! This engine will be built on the cheap (go figure) so a basic valve job should do me good. Now is there any carbed head that is different? like a smaller combustion chamber or something like a v8 head(s)? wich year will flow better if any? Will polishing the intake/exhaust help out with the low end? i know porting will raise the powerband slightly.
-just asking all these questions so i dont pick up a bad head (if any difference)
-just asking all these questions so i dont pick up a bad head (if any difference)
Posting Guru
Joined: Sep 2004
Posts: 1,556
Likes: 5
as far as I know, all carb 300 heads are relatively the same. The only major difference was the 240 vs 300...but even then...not worth losing sleep over.
basic port work wont hurt anything, check out the standard abrasives article, on their site, it applies and should increase efficiency which should equate to better mpg but thats if everything is done correctly.
good luck
basic port work wont hurt anything, check out the standard abrasives article, on their site, it applies and should increase efficiency which should equate to better mpg but thats if everything is done correctly.
good luck
).
Posting Guru
Joined: Sep 2004
Posts: 1,556
Likes: 5
I hate to mention this cause I dont know the details...
but there is/was a company pushing 300 heads on ebay. Supposedly they were new redesigned/cast with attention/corrections made to strengthen known weak areas.
I believe its the same company that allegedly recast the blocks with updates but I cant say 100%.
but there is/was a company pushing 300 heads on ebay. Supposedly they were new redesigned/cast with attention/corrections made to strengthen known weak areas.
I believe its the same company that allegedly recast the blocks with updates but I cant say 100%.
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