Lookin' for an Offenhauser 6227C? - Ford Bronco Forum
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post #1 of 16 (permalink) Old 07-21-2019, 10:38 PM Thread Starter
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Lookin' for an Offenhauser 6227C?

EDIT: Seller just offered it to me for $275 w/free shipping, so it might be had for even less. That's less than what I just paid for mine and $100 off what they are selling for new.

Decent deal on eBay. Advertised for a 240, but from my research is the same for a 4.9/300 Big Six. Do your own research. I do not know the seller, just thought I'd pass it on...

https://www.ebay.com/itm/Offenhauser...4AAOSwzY1dM0iz
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post #2 of 16 (permalink) Old 07-22-2019, 03:35 AM
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Izzat the 4-barrel one? If so, I saw one a couple decades ago, on an early '80s F150 a kid had, sounded sweet at idle but ran like a bat outta hell. Victor Reinz has a single-thickness graphite gasket for the EFI 4.9, but is usable if you have the same thickness on both the intake and exhaust flanges, and doesn't burn out like the old-style doubled gasket ones do.
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post #3 of 16 (permalink) Old 07-22-2019, 10:07 AM
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Yep, that will fit the 300 as well. Recommended for 4bbl carbs 500cfm and above.
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post #4 of 16 (permalink) Old 07-22-2019, 11:13 AM Thread Starter
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Quote:
Originally Posted by Handy_andy_cv64 View Post
Izzat the 4-barrel one?Victor Reinz has a single-thickness graphite gasket for the EFI 4.9, but is usable if you have the same thickness on both the intake and exhaust flanges, and doesn't burn out like the old-style doubled gasket ones do.
BB answered the 4 barrel question. I'll have to check out the gasket.

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Originally Posted by BigBlue 94 View Post
Recommended for 4bbl carbs 500cfm and above.
I bought one just like it a few weeks ago. I got the single plane b/c I was planning on running a 2150 on it, then found a deal on a QUICK FUEL SL-450. I hadn't seen anything about them being recommended for 500cfm and above, so do you know why this recommendation?
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post #5 of 16 (permalink) Old 07-22-2019, 11:58 AM
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It has to do with the volume of the plenum and runners. The big plenum slows down the intake charge, so the more air allowed in by the carb. The better. Personally, I run a Clifford open plenum, that's almost the same. I've run a 390 and a QFT 450 on it just fine.
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post #6 of 16 (permalink) Old 07-22-2019, 12:38 PM
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Btw, the QFT slayer 450 is a fantastic carb. Tons of adjustments compared to the old Holley 390 i had. It takes all standard Holley parts. The only 'advanced tuning' I did was shrink the power valve restrictors down a few thou. That and a slight upsize on the main jets were the only things I swapped.

I did remove the fuel bowl vent tubes and made an off-road style one like on the Holley truck avenger. I also added whistles to the fuel bowl vents, to help with off camber situations. However, they interfered with the floats, keeping them from fully closing the seats. So I trimmed the whistles to fit.
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post #7 of 16 (permalink) Old 07-23-2019, 11:28 AM Thread Starter
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Originally Posted by BigBlue 94 View Post
Btw, the QFT slayer 450 is a fantastic carb. Tons of adjustments compared to the old Holley 390 i had. It takes all standard Holley parts. The only 'advanced tuning' I did was shrink the power valve restrictors down a few thou. That and a slight upsize on the main jets were the only things I swapped.

I did remove the fuel bowl vent tubes and made an off-road style one like on the Holley truck avenger. I also added whistles to the fuel bowl vents, to help with off camber situations. However, they interfered with the floats, keeping them from fully closing the seats. So I trimmed the whistles to fit.
I remember reading your posts on the mods, but I don't remember it being a QFT. I'll have to go back and look at it again. Thanks for the info
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post #8 of 16 (permalink) Old 07-23-2019, 11:51 AM
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Quote:
Originally Posted by SRWillis View Post
I remember reading your posts on the mods, but I don't remember it being a QFT. I'll have to go back and look at it again. Thanks for the info
@AbandonedBronco went further and added a secondary metering plate to his. But now he is running efi, and I have his collection of carb tuning parts.

Between him and the guys over at Fordsix I got it running great. Averaged 12mpg on the whole moab trip. I got 14 mpg on the way home, coming down from 11,000 ft to 900 ft. And that's at 3500rpm on the highway for 900 miles.
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post #9 of 16 (permalink) Old 07-23-2019, 01:29 PM
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Originally Posted by SRWillis View Post
Decent deal on eBay. Advertised for a 240, but from my research is the same for a 4.9/300 Big Six. Do your own research. I do not know the seller, just thought I'd pass it on...

https://www.ebay.com/itm/Offenhauser...4AAOSwzY1dM0iz
Not a bad deal on it. They've gone up in price a LOT of the last few years. It seems about $25 - $50 every 6 months or so. I think the 300s are starting to get more and more common in the hot-rodding department and the intakes are being priced to match.

For what it's worth, the 240 and the 300 are identical.
The only differences are in the size of the cylinder head chambers, and the length of the piston connecting rod. Otherwise, without looking up the part numbers, you can't visually tell one from the other. So, if it works on a 240, it'll work on a 300, and visa versa.

Lots will bolt a 240 head to a 300 for an easy 0.5 compression bump.

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BB answered the 4 barrel question. I'll have to check out the gasket.

I bought one just like it a few weeks ago. I got the single plane b/c I was planning on running a 2150 on it, then found a deal on a QUICK FUEL SL-450. I hadn't seen anything about them being recommended for 500cfm and above, so do you know why this recommendation?
For the gasket, I'd go with the Remflex 3005. It's a fantastic gasket, and is great for non-stock mods like aftermarket intakes, headers, EFI exhaust manifolds, etc. It also doesn't need to be retorqued once installed. Just be sure to only buy it from SummitRacing, or Remflex themselves as they're the only authorized dealers, and the gasket gets damaged if it gets bent (which kept happening when I ordered it from Amazon).

Quote:
Originally Posted by BigBlue 94 View Post
It has to do with the volume of the plenum and runners. The big plenum slows down the intake charge, so the more air allowed in by the carb. The better. Personally, I run a Clifford open plenum, that's almost the same. I've run a 390 and a QFT 450 on it just fine.
Correct, it's the size of the plenum and runners. Granted, I ran a 390 cfm on an Offenhauser C and it worked just fine. But, to get the full benefit, you should go with a larger carb. The 300 has some BIG cylinders, and it is quite happy with 500 - 600cfm carbs.
The best gas mileage I ever got with my 300 was with a 600cfm Holley.



Quote:
Originally Posted by BigBlue 94 View Post
Btw, the QFT slayer 450 is a fantastic carb. Tons of adjustments compared to the old Holley 390 i had. It takes all standard Holley parts. The only 'advanced tuning' I did was shrink the power valve restrictors down a few thou. That and a slight upsize on the main jets were the only things I swapped.

I did remove the fuel bowl vent tubes and made an off-road style one like on the Holley truck avenger. I also added whistles to the fuel bowl vents, to help with off camber situations. However, they interfered with the floats, keeping them from fully closing the seats. So I trimmed the whistles to fit.
The QFT 450 is a really nice compromise of a "big" carb, and one small enough to give you that good, low end throttle snap. I really liked it. :) (I just like my Sniper more )
I ran into the same thing with the vent whistles as they kept jamming the floats.

Quote:
Originally Posted by BigBlue 94 View Post
@AbandonedBronco went further and added a secondary metering plate to his. But now he is running efi, and I have his collection of carb tuning parts.

Between him and the guys over at Fordsix I got it running great. Averaged 12mpg on the whole moab trip. I got 14 mpg on the way home, coming down from 11,000 ft to 900 ft. And that's at 3500rpm on the highway for 900 miles.
Sounds like some good mpg with the 37" tires! Gotta love that, especially at those RPMs. I'm curious how it'd do if you were able to get overdrive and bring those RPMs down below 3000.
Glad you have it running nicely..
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post #10 of 16 (permalink) Old 07-23-2019, 02:01 PM
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Lol I was cruising at 16.5:1 AFR on the way back. By the time I got to Colby at 3500ft, I was at 17.5:1 and it was struggling to maintain 70mph without opening the secondaries. I swapped in the bigger jets and it was back to normal.

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post #11 of 16 (permalink) Old 07-23-2019, 02:05 PM
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That's what's so awesome about having a wideband O2. Otherwise, you'd have no idea!

It'd just "not run right".
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post #12 of 16 (permalink) Old 07-24-2019, 01:07 PM Thread Starter
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Quote:
Originally Posted by BigBlue 94 View Post
@AbandonedBronco went further and added a secondary metering plate to his. But now he is running efi, and I have his collection of carb tuning parts.

Between him and the guys over at Fordsix I got it running great. Averaged 12mpg on the whole moab trip. I got 14 mpg on the way home, coming down from 11,000 ft to 900 ft. And that's at 3500rpm on the highway for 900 miles.
Gettin' that MPG is very good for screamin' down the highway at 3500 rpm and gettin' AB's parts was a very good deal

Quote:
Originally Posted by AbandonedBronco View Post
Not a bad deal on it. They've gone up in price a LOT of the last few years.

For what it's worth, the 240 and the 300 are identical.

For the gasket, I'd go with the Remflex 3005. Just be sure to only buy it from SummitRacing, or Remflex themselves as they're the only authorized dealers, and the gasket gets damaged if it gets bent (which kept happening when I ordered it from Amazon).

The 300 has some BIG cylinders, and it is quite happy with 500 - 600cfm carbs.
The best gas mileage I ever got with my 300 was with a 600cfm Holley.
From what I saw, they are going for $380. I edited the OP as the seller offered it to me for $275 and it has free shipping. (I have it saved on my watch list).

Sounds like the 300 is pretty much just a stroked 240 then, with a little bit different head chamber. I wasn't sure the intake ports were the same, so I just wanted a potential buyer to be sure...

I remember you and BB going through the frustration of gettin' some bent gaskets...

Best MPG with a 600cfm eh? Not doubting you, it's just all I can remember (that's probably the problem ) reading is that is too big, but I did think it strange that they were put on V8s with virtually the same cubic inch

Who would have thought I would learn so much from posting a manifold that was for sale
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post #13 of 16 (permalink) Old 07-24-2019, 03:06 PM
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Yeah, the performance with the 600cfm wasn't the greatest (the engine was stock) but I had it on for about 2 years, so plenty of time to get a good gas mileage base. It just kept getting great gas mileage over and over again. 15 in town was average, which just blew me away.
No idea why, but I didn't complain.
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post #14 of 16 (permalink) Old 07-24-2019, 03:28 PM
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Quote:
Originally Posted by SRWillis View Post
Gettin' that MPG is very good for screamin' down the highway at 3500 rpm and gettin' AB's parts was a very good deal



From what I saw, they are going for $380. I edited the OP as the seller offered it to me for $275 and it has free shipping. (I have it saved on my watch list).

Sounds like the 300 is pretty much just a stroked 240 then, with a little bit different head chamber. I wasn't sure the intake ports were the same, so I just wanted a potential buyer to be sure...

I remember you and BB going through the frustration of gettin' some bent gaskets...

Best MPG with a 600cfm eh? Not doubting you, it's just all I can remember (that's probably the problem ) reading is that is too big, but I did think it strange that they were put on V8s with virtually the same cubic inch

Who would have thought I would learn so much from posting a manifold that was for sale
Keep in mind, I averaged 10mpg on the way up the mountains. 14 on the way down.

Yes, the 300 IS a stroked 240. That's why you cant get much of a "stroker" kit for a 300. It's much like the 351M/400 where the heads, intake, exhaust, distributor, cam etc all interchange. Only the rotating assembly is different. And as AB pointed out, the combustion chambers are slightly larger on the 300. Because of the shorter stroke, the 240 revs higher and makes its power about 1000 rpm higher than the 300. A 240 would be great in a small sports car.
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post #15 of 16 (permalink) Old 07-24-2019, 07:53 PM
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Quote:
Originally Posted by BigBlue 94
A 240 would be great in a small sports car.
If it'd fit!
It's still the same size physically as the 300. Thinking back to that RX7 with the 300 squeezed into it. 🤣
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post #16 of 16 (permalink) Old 07-25-2019, 08:50 AM
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Yeah, not as small as that Mazda lol. Something like a Jag that already had an inline in it.

Or maybe just a stripped down, lowered, and tubbed bumpside F100...

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