4bbl Slant Intake

-
T

TF360

Well-Known Member
Joined
Apr 25, 2014
Messages
2,505
Reaction score
909
Location
Florida
Ok, I know this has been discussed, but I am going to put a small 4bbl and headers on my 1974 225 Duster. Which intake is better Clifford or Offenhauser. Which one fits the best? Also which Headers Hooker or Clifford. Don't want Dutra manifolds. Show me your similar combo's and what problems you ran into. Thanks
 
If you gonna go with the Clifford (which is more suitable for higher RPMs) then you have to run headers. The Offy you can run a stock manifold, modified stock manifold or headers. The Offy is more suited for less than all out performance. As you stated not much choice in headers - some don’t fit well with PS.
 
Lets not jump to conclusions prematurely here, TF360 didn't ask which new 4bbl Slanty intakes were better, and do they still make the traditional 4bbl intake at all nowadays?? There have been a couple of opinions based on individual experiences that the Cliffy old-school intakes weren't inferior on the low end compared to the Offy. I have yet to see a mult-intake dyno test on one, let alone two Slanty set-ups, back-to-back-to-back-to-back for any valid guidance other than opinions. The Guys who are racing regularly have generally said the Cliffy is a better top-end unit.....which I believe. What is the intended goal??
 
Also, being that You're in Florida, cold-start heat isn't going to be much of an issue for You to be concerned with. Lucky Dog...................
 
I've run Offy and Clifford .On a street car you will see very little difference.
Yes SSDan is right Clifford has a bad sales rep. The products are good if he (Larry) has them in stock. If not you will wait months or more for your parts that you pay for up front.
Offy's still can be had new.
I just missed buying a new in box Weiand at the Nats a few weeks ago. Kick myself for walking away from it..
Hookers are easy to get same as the Offy intake.Summit,Jegs,Speedway Motors.
You may be lucky and find (both) some used.
Clifford shorty's are good I've used them several times over the years.
 
Photos for you of Offy,Clifford, Both headers and intakes.
The best header was the Mopar Performance 6 into 1 but no longer made.
Home made Y-Pipe for the Cliffords.My personal taste is 2 1/2'' single exhaust to the rear bumper.
IMG_1932.jpg
IMG_1934.jpg
IMG_0435.jpg
IMG_0436.jpg
 
Darter, I assume the hookers are in the last pic. How did you get them to seal. I have seen that you have to shave some material off the intake so that it is the same thickness as the Header flange. What did you guys have to do there?
 
Oh I'm looking for more of a high performance street car. More torque is better
 
TF360, where are you in Florida? If you are close enough, I have several different sets of headers, and both Clifford, and Offie manifolds on hand. You could come and look at the differences.
 
Charlie- Thank you- I'm way down in south Florida, but I appreciate that
 
Another shot of Clifford. The 6 into 1 are the Mopar headers.
Of the 4 cars we did I did not have to cut anything from the intake.
I have heard of guys using 1/4'' nuts welded to the header flange to take up space.
Also look into using a REMFLEX intake/exhaust gasket.They are very good.

IMG_1914.jpg
 
@Bighead440 and I were just talkin about the Clifford VS the Offy just the other day. He pointed out that the Offy has much closer to equal length runners than the Clifford. I think that's worth an edge right there.
 
Clifford you can clock the carb in any direction, also Clifford is better for higher rpms if your slant can reach those rpms, with bigger valves and a good port job.

Offenhauser Better on the low end side, these motors need a lot of torque and compression, remember if it's an auto kick down issues with arise. Also change that rear gear when going from one barrel to four you will lose low end 3.23 is good with an auto.
 
Ok Darter, so just that Remflex gasket and it will bolt right up. Clifford intake and header flanges are the same thickness.
 
Clifford and offie intake flanges are the same thickness. Clifford headers have the same thickness flange as the intakes. Hooker header flanges are thinner, and need a button or nut welded on to make up the thickness. Aussie Speed header flanges are thinner, but have "buttons" welded on to make up the difference. The old mopar performance 6-1 headers (made by JR) may or may not have nuts welded to the flange. I have one of each.
 
Last edited:
One last question- I have power steering and A/C. What issues there? 1974 Duster
 
I don't think there is a problem, but don't know for sure. I do know, there is a problem with Clifford shorties and power steering on the 66 and older "A" bodies. The front collector hits the top of the PS gear box.
PS: As far as I know, The Aussiespeed headers are the only currently made header that fit with a 170 engine in the early (66 down) "A" bodies, but the Clifford shorties can be modified to fit without PS.
 
TF360 said:
Ok, I know this has been discussed, but I am going to put a small 4bbl and headers on my 1974 225 Duster. Which intake is better Clifford or Offenhauser. Which one fits the best? Also which Headers Hooker or Clifford. Don't want Dutra manifolds. Show me your similar combo's and what problems you ran into. Thanks
Click to expand...

You might want to check out AussieSpeed and their 4 bbl intakes. They have 9 different intakess 2 bbl, 4 bbl, 2-4 bbl with long and short runners. A bit pricey, but they work well. I have a long runner with a 390 cfm Holley that I ran for two years on a 73 Mordor.
To take full advantage of carb & headers, you may want to try having block and head milled to up CR.
 
Slantsix64 said:
Clifford you can clock the carb in any direction, also Clifford is better for higher rpms if your slant can reach those rpms, with bigger valves and a good port job.

Offenhauser Better on the low end side, these motors need a lot of torque and compression, remember if it's an auto kick down issues with arise. Also change that rear gear when going from one barrel to four you will lose low end 3.23 is good with an auto.
Click to expand...

I can clock the carburetor whichever direction I want on this Offenhauser too. I also think it's arguable which is better where. Do you have some data to back it up? I've never seen any dyno figures on either manifold. I've always seen people say the Clifford was "better" but I'm not sure. Certainly, the Offenhauser has closer to equal length runners......for "whatever" that's worth.
 
RustyRatRod said:
I can clock the carburetor whichever direction I want on this Offenhauser too. I also think it's arguable which is better where. Do you have some data to back it up? I've never seen any dyno figures on either manifold. I've always seen people say the Clifford was "better" but I'm not sure. Certainly, the Offenhauser has closer to equal length runners......for "whatever" that's worth.
Click to expand...
nope i read it on .org, on the offy? i cant clock my carb sideways only goes one way.
 
Last edited:
Slantsix64 said:
nope i read it on .org, on the offy? i cant clock my carb sideways only goes on way.
Click to expand...

Then you have no imagination. lol

And gosh, if you read it on .org then it must be gospel. lol
 
You must log in or register to reply here.
-

Back
Top