post #1 of Old 11-22-2013, 01:34 PM Thread Starter
pityocamptes
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Join Date: Aug 2002
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Anyone have a part number for Offenhauser dual plane intake for 4.0 head (cast 7120)?

I am getting my engine soon (stroker) and from everything I have been reading is that the Clifford 6=8 intake only produces more hp at higher rpm's, which are probably unattainable for the L6. It would seem, unless someone has a better thought, that the offenhauser 4bbl intake (dual plane) might be better for low rpm torque. Anyways, I have the part number for the clifford intake, but if anyone knows the part number or link to a Offenhauser intake for the 4.0 HO head (cast 7120), it would be appreciated. Thanks.

I looked on Summit racing and couldn't figure out if they had one that would fit the head...

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post #2 of Old 11-23-2013, 05:07 AM
gmakra
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pity the head casting will make no difference with the exception of 0331 head which is 2000 + and has smaller intake and exhaust ports.
Here is the link to Summit http://www.summitracing.com/parts/ofy-6257dp/overview/

BTW the Offy and Clifford manifolds are made at the exact same foundry in Los Angles so they are the same quality which is good.
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post #3 of Old 11-25-2013, 08:36 AM Thread Starter
pityocamptes
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Quote:
Originally Posted by gmakra View Post
pity the head casting will make no difference with the exception of 0331 head which is 2000 + and has smaller intake and exhaust ports.
Here is the link to Summit http://www.summitracing.com/parts/ofy-6257dp/overview/

BTW the Offy and Clifford manifolds are made at the exact same foundry in Los Angles so they are the same quality which is good.
Thanks! If you had to choose one, would you go with the offy dual plane, or clifford single? Its a stroked engine, with comp cam, and I was thinking of putting the truck avenger carb 470cfm... Thanks.
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post #4 of Old 11-25-2013, 09:56 AM
swatson454
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To be honest, I don't see a single thing about the Offy that's "right". My personal opinion would be the Clifford with a 4-hole tapered spacer. That will slow the air down and give it some direction before dumping it into the plenum. It would probably help on the Offy too but I don't see how in the world you can keep the fuel from crashing into the floor on the primary plenum.

There are cheaper tapered spacers out there but that is a good pic to illustrate the difference between it and a regular spacer.


Shawn

Live in a way that those who know you but don't know God will come to know God because they know you.
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post #5 of Old 11-25-2013, 11:30 AM
gosupes
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Quote:
Originally Posted by swatson454 View Post
To be honest, I don't see a single thing about the Offy that's "right". My personal opinion would be the Clifford with a 4-hole tapered spacer. That will slow the air down and give it some direction before dumping it into the plenum. It would probably help on the Offy too but I don't see how in the world you can keep the fuel from crashing into the floor on the primary plenum.

There are cheaper tapered spacers out there but that is a good pic to illustrate the difference between it and a regular spacer.


Shawn
One of the issues with running a spacer is clearance between the carb and brake booster, depending on the carb type and booster type/size of course. Found out the hard way.

To be honest, I have heard the same thing about the dual plane, that they are better for low end, and I really cannot make an apples to apples comparison, but I don't think I am suffering from lack of low end torque with the Clifford intake. If I was building a stroker, first choice would be FI, but I would not have any qualms about using a Clifford and good carb.

1986 CJ7, 4.2 w/4.0 head, TFI-HEI hybrid ignition, Clifford manifold w/Holley 390 w/cold air intake, OBA, 4.5" lift, Woody CV shaft and Tattons in front, 4.10 gears - lunchbox in front, Truetrac in the back, twin-sticked, blower upgrade for running topless, trying to keep it simple.

It's just a Jeep, and if you don't wheel it once in a while, it's not even that.
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