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Author Topic: Rare 427 MR. C5AE-6090-F Big F head  (Read 2256 times)

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Jim Demmitt Jr

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Rare 427 MR. C5AE-6090-F Big F head
« on: June 21, 2021, 02:16:04 PM »
« Last Edit: July 03, 2021, 08:14:38 PM by Jim Demmitt Jr »
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My toy's show and strip car 1963.5 427 R code Galaxie XL dads old NHRA record holder keeping her alive and thundering

Original 1969 Boss 429 Mustang KK 1708 my project car hope to finish it before I am 6 feet under

Jim Demmitt Jr

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Re: Rare 427 MR. C5AE-6090-F Big F head
« Reply #1 on: July 01, 2021, 11:52:39 AM »
New updated link added
« Last Edit: July 03, 2021, 08:14:05 PM by Jim Demmitt Jr »
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My toy's show and strip car 1963.5 427 R code Galaxie XL dads old NHRA record holder keeping her alive and thundering

Original 1969 Boss 429 Mustang KK 1708 my project car hope to finish it before I am 6 feet under

Keith Stevens

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Re: Rare 427 MR. C5AE-6090-F Big F head
« Reply #2 on: July 01, 2021, 02:47:00 PM »
I have seen both heads. I've never heard of different flow numbers or chamber design from Big F to small. Where is the 30-50 extra horsepower derived from?
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428kidd

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Re: Rare 427 MR. C5AE-6090-F Big F head
« Reply #3 on: July 02, 2021, 08:09:21 AM »
While i cant say its 30-50 HP i can say the Big F are supposed to be better than the small F heads, same with the SK heads which are supposed to be the best Med riser heads. Some of the classs racers might be able to tell you the differences better than I can.
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DEANs427

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Re: Rare 427 MR. C5AE-6090-F Big F head
« Reply #4 on: July 02, 2021, 01:45:21 PM »
Ran my Big F MRs for years, noticeably better than small F
« Last Edit: July 02, 2021, 01:47:42 PM by DEANs427 »
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1956 Ford Gasser 427FE
1966 Fairlane
1966 Bronco supercharged

Keith Stevens

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Re: Rare 427 MR. C5AE-6090-F Big F head
« Reply #5 on: July 02, 2021, 05:11:38 PM »
I have a set of the aluminum 427 SK heads. I never ran them because of what used to happen to the valve pockets.  I bought them from Ron Miller at Ford Power Parts before I knew what happened to them when they were used on the street.
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dozz302

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Re: Rare 427 MR. C5AE-6090-F Big F head
« Reply #6 on: July 06, 2021, 10:33:16 AM »
Looks like somebody killed the exhaust ports, what a shame.
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Dumpling

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Re: Rare 427 MR. C5AE-6090-F Big F head
« Reply #7 on: July 07, 2021, 10:27:39 AM »
Curious. This is for ONE head. What would happen if this head were paired with an "ordinary" MR head on the same engine?
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chilly460

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Re: Rare 427 MR. C5AE-6090-F Big F head
« Reply #8 on: July 07, 2021, 10:50:03 AM »
Quote from: Dumpling on July 07, 2021, 10:27:39 AM
Curious. This is for ONE head. What would happen if this head were paired with an "ordinary" MR head on the same engine?

That’s an old NASCAR trick, they’d put the Big F on the right engine bank and the extra power would naturally make the car turn left…
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JacksFordParts

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Re: Rare 427 MR. C5AE-6090-F Big F head
« Reply #9 on: July 08, 2021, 11:01:05 AM »
Quote from: chilly460 on July 07, 2021, 10:50:03 AM
Quote from: Dumpling on July 07, 2021, 10:27:39 AM
Curious. This is for ONE head. What would happen if this head were paired with an "ordinary" MR head on the same engine?

That’s an old NASCAR trick, they’d put the Big F on the right engine bank and the extra power would naturally make the car turn left…

Thanks Chilly, I needed a good laugh today. Quota filled with that gem...
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dozz302

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Re: Rare 427 MR. C5AE-6090-F Big F head
« Reply #10 on: July 08, 2021, 09:44:26 PM »
Dean, what are the details on those flow numbers.
Was that an completely stock head? Or did it have modifications. Those numbers are strong.
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DEANs427

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Re: Rare 427 MR. C5AE-6090-F Big F head
« Reply #11 on: July 09, 2021, 08:42:20 PM »
They were "prepped" NHRA legal for stock eliminator heads I got with the R code Fairlane when I bought it. Date codes were not correct for Fairlane resto so I used them on the stock eliminator car until I sold the car, kept the top end and then put them on the gasser motor where they ran until 2 years ago when one intake wall casting collapsed and locked the motor with coolant after breaking a flexplate and subsequent internal  vibrations. sold the remaining good head to Jack and the bad head to another forum member as a repair project.
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1956 Ford Gasser 427FE
1966 Fairlane
1966 Bronco supercharged

Keith Stevens

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Re: Rare 427 MR. C5AE-6090-F Big F head
« Reply #12 on: July 17, 2021, 04:43:47 PM »
Quote from: chilly460 on July 07, 2021, 10:50:03 AM
Quote from: Dumpling on July 07, 2021, 10:27:39 AM
Curious. This is for ONE head. What would happen if this head were paired with an "ordinary" MR head on the same engine?

That’s an old NASCAR trick, they’d put the Big F on the right engine bank and the extra power would naturally make the car turn left…

That's hilarious, Chilly.  I guess Jack gets the good head too.  Hell, I'm just not touching this any further!  ;D
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