favorite 4bbl slant intake

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pishta

pishta

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Clifford, offy, Hurricane, Dutra Hyper-Pak repop?

Heat or no heat?

Testing the waters for the most popular, cost not really a factor. More interested in design concensus.

Offy had long stock looking runners, Clifford had shorter runners with a larger plenum. Aussiespeed Hurricane had crazy long runners and Dutra had the long runners coming out the same side of the plenum so 4 distinct designs.
 
I run the Offy intake with the carb facing the passenger fender, i also run Franks water hot box under the intake spliced into the heater hose to provide proper heat. I wanted to run the clifford intake but its designed for higher Rpms, i need more torque , 5500 limit
 
I think all of the manifolds listed have their particular nuances and advantages.
Cliffords are the go to manifold on the racing scene, have better performance at higher Rpm’ when compared to an offy.
Cliffords can be found with and without water heat accommodations and with and without cast on nitrous bosses, but none will match up to a stock slant six exhaust heat box.
The 4bbl Offy does not perform like a Clifford at high ( for a slant) RPM, but does match up to a stock slant exhaust manifold heat box.
The newer Aussie speed manifolds have removable top plates so you can run either large 2 bbl carbs or 4 bbl. From what I have read a Clifford will out perform an Aussie speed at the drag strip. That does not mean that a slant could not be optimized for an Aussiespeed manifold and do well.
Hyperpac is the original slant performance manifold and certainly has the underhood wow factor. It obviously makes use of the legendary and historic mopar intake ram air tuning. With a carb fuel drop out at lower ambient temps is an issue.
For an engine that does not have huge aftermarket support it is amazing that there is a selection of intakes available. And I don’t think there is any one intake that has so much going for it that it would be the top choice for every slant build. But each build should be evaluated and the right intake chosen for it.

That said, I run a Clifford. I wanted the proven race performance and drilled the nitrous bosses for the mpfi.
 
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Ive run the Offy and Clifford. To me I found no noticeable difference.Using a worked Slant capable of high 12 second times in a 67 Dart at 2600 lbs. I liked the Clifford top that has the carb sideways,but again no noticeable difference. My 2 cents.
Never had them heated.
 
my68barracuda said:
I think all of the manifolds listed have their particular nuances and advantages.
Cliffords are the go to manifold on the racing scene, have better performance at higher Rpm’ when compared to an offy.
Cliffords can be found with and without water heat accommodations and with and without cast on nitrous bosses, but none will match up to a stock slant six exhaust heat box.
The 4bbl Offy does not perform like a Clifford at high ( for a slant) RPM, but does match up to a stock slant exhaust manifold heat box.
The newer Aussie speed manifolds have removable top plates so you can run either large 2 bbl carbs or 4 bbl. From what I have read a Clifford will out perform an Aussie speed at the drag strip. That does not mean that a slant could not be optimized for an Aussiespeed manifold and do well.
Hyperpac is the original slant performance manifold and certainly has the underhood wow factor. It obviously makes use of the legendary and historic mopar intake ram air tuning. With a carb fuel drop out at lower ambient temps is an issue.
For an engine that does not have huge aftermarket support it is amazing that there is a selection of intakes available. And I don’t think there is any one intake that has so much going for it that it would be the top choice for every slant build. But each build should be evaluated and the right intake chosen for it.

That said, I run a Clifford. I wanted the proven race performance and drilled the nitrous bosses for the mpfi.
Click to expand...
Hello,
Do you or did you ever run a positive crankcase ventilation with your Clifford manifold? I have the Clifford with the Weber 38/38 carb. When I got the car it just had to vent caps on the valve cover. I hooked up a PCV system to the manifold. Now having a hard time timing it right. The vacuum is really strong, so I'm assuming a stock PCV valve may not be right. Any suggestions on what PCV valve I should be using? Thanx
 
Perseus said:
Hello,
Do you or did you ever run a positive crankcase ventilation with your Clifford manifold? I have the Clifford with the Weber 38/38 carb. When I got the car it just had to vent caps on the valve cover. I hooked up a PCV system to the manifold. Now having a hard time timing it right. The vacuum is really strong, so I'm assuming a stock PCV valve may not be right. Any suggestions on what PCV valve I should be using? Thanx
Click to expand...
Dual Flow Adjustable PCV Valve | M/E Wagner Performance Products
 
Well, don't choke when you see the price, Classic Industries has the chrome steel cap and PCV valve part# MD8078. But for $120 I'd look for a used one.
Shoot us a photo of what you are using now. In the past with a aftermarket valve cover I have used the PCV valve from a 350 chevy of the late 70's.
 
IMG_1687.jpg

In this photo is a stock 64 225 with the steel cap and bolt in PCV valve. Is this what you are looking for ? The valve cover has the 2 stand pipes for the valve and breather.No rubber grommets.
 
I forgot to add, once i clocked my carb towards the pass fender, my engine runs richer. not a bad thing though
 
pishta said:
Clifford, offy, Hurricane, Dutra Hyper-Pak repop?

Heat or no heat?

Testing the waters for the most popular, cost not really a factor. More interested in design concensus.

Offy had long stock looking runners, Clifford had shorter runners with a larger plenum. Aussiespeed Hurricane had crazy long runners and Dutra had the long runners coming out the same side of the plenum so 4 distinct designs.
Click to expand...


Clifford or Offy work well.












.
 
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pishta said:
Clifford, offy, Hurricane, Dutra Hyper-Pak repop?

Heat or no heat?

Testing the waters for the most popular, cost not really a factor. More interested in design concensus.

Offy had long stock looking runners, Clifford had shorter runners with a larger plenum. Aussiespeed Hurricane had crazy long runners and Dutra had the long runners coming out the same side of the plenum so 4 distinct designs.
Click to expand...

Hey @pishta weren't you showing a fuel injection manifold for the slant 6's that were a bit spendy.

I would think you could take an Offy and drill and tap it up near the head port and install your fuel rail there . . Just a thought.
 
RustyRatRod said:
Yup, das a goodun.
Click to expand...
I reckon this intake is going to take a lot of the mild street manners away from the car. I think it's made for higher revving than I will ever do. It's prolly too much for me to get groceries with but I'm going to try it out because I love the wow factor.

This is going in my 65 valiant wagon. The engine is a 70 dated 225 with a shaved head, bored out .030. And the block was decked.

I don't remember the cam specs now but it's supposed to be pretty mean. I bought the cam from 65dartman (member here). Headders of course.

I still need a carb and air cleaner. I could just use a 350 Holley. The air cleaner I have won't fit in the early A, being this close to the driver side.

Some assembly required :eek: so it will probably be another year, or three??? LOL
 
Rainy Day Auto said:
I reckon this intake is going to take a lot of the mild street manners away from the car. I think it's made for higher revving than I will ever do. It's prolly too much for me to get groceries with but I'm going to try it out because I love the wow factor.

This is going in my 65 valiant wagon. The engine is a 70 dated 225 with a shaved head, bored out .030. And the block was decked.

I don't remember the cam specs now but it's supposed to be pretty mean. I bought the cam from 65dartman (member here). Headders of course.

I still need a carb and air cleaner. I could just use a 350 Holley. The air cleaner I have won't fit in the early A, being this close to the driver side.

Some assembly required :eek: so it will probably be another year, or three??? LOL
Click to expand...

Not so. It will be fine. It's all in the combo.
 
RustyRatRod said:
Not so. It will be fine. It's all in the combo.
Click to expand...
I'm still debating what gears and tire size to go with. I'm going with a Ford 8.8, so my gear selection is vast with that. Right now my rear end has 3.73 limited slip.

The rear end kinda locks me into BBP, but I'm thinking 14.... like P195/70/R14 on steel wheels with dog dishes

Also this is a 4 speed car, of course.
 
Rainy Day Auto said:
I'm still debating what gears and tire size to go with. I'm going with a Ford 8.8, so my gear selection is vast with that. Right now my rear end has 3.73 limited slip.

The rear end kinda locks me into BBP, but I'm thinking 14.... like P195/70/R14 on steel wheels with dog dishes

Also this is a 4 speed car, of course.
Click to expand...

Why are you so locked in to such sissy tire sizes? Put some meat under it. It will look so much better.
 
RustyRatRod said:
Why are you so locked in to such sissy tire sizes? Put some meat under it. It will look so much better.
Click to expand...
Cheaper and you can rotate them fronts straight back and rears to the front swapping sides.

I don't know, just seems normal

3.0MaintainingTires_3.2Rotation_ModifiedCrossRotation.jpg
 
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