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#1 |
Registered User
Join Date: Sep 2002
Location: Fort Worth
Posts: 1,409
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I6 Speed part questions
IS there any difference between the offenhauser manifolds and the clifford performances manifolds? Is one that noticibly better than the other one.
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1969 Chevy LWB - with shaved handles; 3 1/2 front/ 5 1/2 rear drop; (waiting to be put back together) |
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#2 |
~Rest In Peace~
Join Date: May 2005
Location: CALIFORNIA NOR CAL
Posts: 9,707
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offenhauser been around along time i would go with offy
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is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex |
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#3 |
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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I don't think it's going to matter either way from a performance perspective. The inline 6 sucks for fuel delivery anyways because of the where the carb sits in relation to the three delivery points. Other things like the split port for cylinders is horrible for good flow.
I would skip the new intake or even new exhaust and cut right to trying to set yourself up with an EFI system. Just my 2¢. There was a big article in HotRod magazine last month about building up L6's. Shows a lot of thing from Kirby's Sissell or whatever and a couple other places included info.
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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#4 |
Account Suspended
Join Date: Jun 2005
Location: Maine
Posts: 427
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I'd go with the clifford. It will cost more, but give you more power. I got that Hot Rod issue, and a 292 bored .060 with a clifford intake, holley 600, a comp cam, and headers made 255 hp and 315 lb ft. Now that is pretty good for an old six banger
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#5 |
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Pretty good, but when you realize that they spent $2k+ on that carb'd 6-banger and think about how you can have a V8 or even late model engine that gets the same gas mileage with better performance and reliability (maybe 10-20 less in torque) for the same cost, seems kinda silly to me to keep the 6 and spend money on it unless you're all about keeping the original engine in the truck.
I looked into the EFI thing and started calling around - the lump port mod and EFI on the heads alone (like from the article) was thousands of dollars and required special exhaust and intake. Then again - I could be a bit jaded. I just wasted $700 building up the L6 I've got in my truck only to replace it with another engine and another $100 on a 4spd tranny + torque converter out of a ¾ ton panel truck that I'll never use also. :\
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. Last edited by shifty; 07-15-2005 at 10:31 AM. |
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#6 |
Keepin an eye out
Join Date: Feb 2003
Location: So.Cal
Posts: 3,921
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I have a nice new Clifford cam if your interested PM me.
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1970 Chevy C10 SWB 5.3 1996 Toyota Tacoma SR5 4x4 2007 Vespa GTS 250 Scooter ZIP 91351 Last edited by boraxman; 07-15-2005 at 02:04 PM. |
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#7 |
Where's my beer?
Join Date: Oct 2004
Location: Glen Allen, VA
Posts: 1,768
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While I can't give you any comparison btwn Clifford and Offy, I will give a thumbs up for the Clifford intake on my 250. My 6 will surprise a lot of V8 owners.
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70 C10, shortstep, .30 over 250,Hurst shifted 3 spd parts hauler. Holley 390, Clifford Intake, Header, ported cylinder head, unknown bigger cam. 79 Corvette L82, 4 spd, black, red interior, headers, flowmasters, and unkown bigger cam. '03 Grand Cherokee Laredo, 4.0 4x4 daily driver. 165K miles, and runs great '08 Tahoe LTZ 4x4 155K |
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#8 | |
Registered User
Join Date: Apr 2003
Location: Central PA....In the Berg of Nisbet
Posts: 790
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Quote:
Some of the best engines we ever had in our work trucks were inliners, whether GM's 250 or 292, or Fords 300...........Low Mantainance, and kept pulling when everything else would have given up.
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'72 K-20 EFI'ed 250 Inline/4spd stake body, Farm Truck '71 C-20 Cummins Diesel Powered, In storage thanks to $5.00 diesel! '69 3500 GMC 305V-6/4spd, Still under reconstruction.......... Inlines Rule! 6 soldiers standing is better than 8 laying down!!!!!!!! |
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#9 | ||
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Quote:
I actually think we agree more than you know, but I get the impression that your idea of "reliability" is different than mine. Quote:
Now, I won't sit and argue this one out - I KNOW in terms of LONGEVITY when it comes to mechanics, my L6 will OUTLAST a modern V8 with EFI (like my vortec) any day. There's no comparison. There's an ass-ton of things to break in new engines, but like .. nothing to break in an L6. So, yeah, in that regard, outside of vibrations, trying to kill an L6 is like one of us trying to beat an elephant to death with your bare hands. If you ask my opinion, in terms of reliability...the 4.8L Vortec in my '03 Sierra started up every time I turned the key for as long as I owned it (put an assload of highway miles on it and traded it in). With my L6 (both of them), if I didn't manually choke, tap the gas pedal twice, then turn it over and tap the gas again a few times, it wouldn't run on its own long enough to warm up, even after having a pro go through and carb and timing (when I had HEI on and when I had points on) with new plugs, wires and everything else under the sun. I also don't hafta wait for a late model V8 to warm up, which is another big plus. On the topic of heat, my new V8 (and even the smallblock 350 that was in my '70 Impala) never had problems firing when the engine was hot like my truck sometimes will. I love my L6, but it's a love-hate relationship. It's all torque and less HP. With any model of V8 I've owned, I've never had the little quirks and hassles (call it "character") that my L6 has. My L6 doesn't strike me as a "reliable" engine. It strikes me as a "mule". It gets up and goes when you want it to, it will really kick some ass and lug a load when you need it, but if you rub it the wrong way, it either won't move an inch or it'll kick you in the face.
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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#10 | |
Registered User
Join Date: Apr 2003
Location: Central PA....In the Berg of Nisbet
Posts: 790
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Quote:
My main complaint is everytime I see someone wanting to keep a 250 or a 292, it always seems that the "Put a V-8 in it" is brought up............Like the Straight 6's are some POS, poorly designed powerplant..........Well, that really rubs me the wrong way. Those little Inliners made me more money over the years than any other engine...............And I think it is great people want to KEEP one of these instead of throwing in a V-8 like everyone and their brother is anymore. Not trying to ruffle any feathers, but when a man asks a question he wants answers, not two cents about whether it is worth it or not..........
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'72 K-20 EFI'ed 250 Inline/4spd stake body, Farm Truck '71 C-20 Cummins Diesel Powered, In storage thanks to $5.00 diesel! '69 3500 GMC 305V-6/4spd, Still under reconstruction.......... Inlines Rule! 6 soldiers standing is better than 8 laying down!!!!!!!! |
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#11 | |||||
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Quote:
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I agree and add this: They also don't want someone coming in to start an argument, effectively hijacking their thread. Which is the lesser of two evils? I actually answered his question...did you? Then you felt the need to give your 2¢ and continue with it instead of answering his question. Did I lie in my post when I said "it won't matter b/c fuel delivery sucks?" No. It's a known fact that distribution to the 1-2 and 5-6 cylinders is poor with stock or aftermarket manifold. fitment will be roughly the same with both manifolds. Performance is going to be roughly the same also. As for the arguing on whether they're worth it or what money they've made, that's outside the scope of the thread, has nothing to do with the original poster's question, so if you want to argue about it, I'm not going to get the thread closed by commenting back any more ![]() Which would I choose personally? The Clifford. Adn I'd drop a 600cfm+ carb on top of it. And it would see a siginificant gain in power. But it's still an inline 6. ![]()
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. Last edited by shifty; 07-15-2005 at 05:38 PM. |
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#12 |
Registered User
Join Date: Jan 2004
Location: Oakdale, CA
Posts: 101
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To answer the original question. Offenhausers are usually considered better for the bottom end performance, because they have shorter runners, Cliffords are better on top end. That said "I don't think it's going to matter either way from a performance perspective", depending on how you intend to build the 292.
1963 292 420 4.11 Detroit locker Camper 1968 327 485 3.73 Daily Driver |
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#13 |
Excelsior, You Fathead.
Join Date: Jun 2004
Location: Valparaiso, In
Posts: 937
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Offy is better,try www.inliners.org for more help.
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Go Navy. The Sea Is Ours. Budget 350 Build http://67-72chevytrucks.com/vboard/s...38#post2264638 |
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#14 | |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,280
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Quote:
I use an Offy intake and Clifford headers with an Edelbrock 500 CFM AFB-clone 4 Bbl carb on my 292. The first 2 components ran 25 years on my last engine. Sadly, the 390 CFM Holley didn't make it to the next lifetime, so I had to get a new carb.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#15 | |
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Quote:
I've got a stock intake right now on my truck with Dynomax headers (dual exhaust). I haven't plumbed the exuast yet and I'm not planning on it. The collectors on the headers hang way too low - literally, here's a picture: ![]() ![]() I can't handle it. I can't lower my truck like that. I had to beat the living bejesus out of the #1 tube just to get the damned thing to fit around the manifold.
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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#16 |
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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PS if anyone wants to buy a brand new pair of Dynomax headers (pictured) for an L6, I'll sell them for $100 and I pay shipping. They sound great, but I plan on laying frame in the truck eventually, so the headers gotta go.
I paid $160 for them brand new. They come with adapters and all hardware. I modified (with ball peen hammer) on the #1 pipe to make them fit under a stock exhaust. Should not affect performance. Need to be sandblasted and repainted, I will throw in a half a can of Eastwood's Header Paint with all application brushes for free.
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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#17 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,280
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With a 292 the headers are about level with the frame. Have you considered shortening the header down tubes? If that's possible.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#18 |
Where's my beer?
Join Date: Oct 2004
Location: Glen Allen, VA
Posts: 1,768
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I just have the Clifford intake, with no water jacket plumbed. I can reach in standing outside the truck first thing in the morning and hit the key and it will start instantly every time. I currently have no choke on the carb, but will get it working again for the winter, but when the choke was working in the winter I just hit the gas pedal once or twice, and again, instantly fired up, no cranking whatsoever. I have a 390 Holley on mine.
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70 C10, shortstep, .30 over 250,Hurst shifted 3 spd parts hauler. Holley 390, Clifford Intake, Header, ported cylinder head, unknown bigger cam. 79 Corvette L82, 4 spd, black, red interior, headers, flowmasters, and unkown bigger cam. '03 Grand Cherokee Laredo, 4.0 4x4 daily driver. 165K miles, and runs great '08 Tahoe LTZ 4x4 155K |
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#19 |
Registered User
Join Date: Dec 2004
Location: Little Rock, Arkansas
Posts: 38
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So would a two single barrel carb intake or three carb intake supply more fuel to the front and rear cylinders?
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1969 C-10,short bed, I6 250, 3x1 offy, HEI, headers, 5 speed, original paint and family owned! |
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#20 | |
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Quote:
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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#21 | |
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Quote:
__________________
If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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#22 |
Registered User
Join Date: Dec 2000
Location: Gresham, OR, USA
Posts: 106
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A redesigned 3 carb intake would supply an even amount of fuel to each of the cylinder pairs. The current manifold is uneven because the runners are of uneven length. Less drag on the intake charge to get to cyls 3 and 4 vs the other ends.
A side note- if you want 400hp without spending ten thou(not saying you did), add a turbo. Should be able to get 400hp easy. Don't know how long the motor will last. I am putting a GM turbo (3.8L) on a Ford 250 inline.
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72 GMC K20, 454, TH350 00 GMC Yukon 66 Ford Bronco |
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#23 |
Senior Member
![]() ![]() Join Date: Jan 2005
Location: CA
Posts: 5,525
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I bought a set of headers from Clifford about 13 years ago that had the collectors up in the engine compartment so there were no clearance issues. Of course I think I paid way more than $160 for them.
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#24 |
Hunting is Life
Join Date: Jun 2005
Location: Buffalo,MN
Posts: 115
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Does OFFY have a website?
Pat |
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#25 |
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Since nobody else has answered, I dug in last month's HotRod magazine and pulled up the following set of links you will find utterly useful in finding performance parts for your inline 6:
Offenhauser (This sales site is worthless 'cept for finding dealers): http://www.romax.addr.com/offy/ A huge Offenhauser parts distributor (I cannot endorse their service!): http://www.offyparts.com Clifford: http://www.cliffordperformance.com Sissells Automative (they do massive reconstructions of parts for your engine): http://www.sissellsautomotive.com Injection Logic (if you want to convert to EFI): http://www.inkectionlogic.com Crower Cams & Equipment: http://www.crower.com Crane Cams: http://www.cranecams.com These should keep you busy. Check out Sissell's site and download their price sheet. Check out all the cool head designs and other crap they got for inlines. Lots of cool stuff. You'll find lots of intake options at clifford and possibly at offyparts.com. You'll be amazed at what you'll find at JC Whitney also ...
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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