Inliners International Forums General Discussion Engines 4 brl carb placement

I have searched many different sites to include this one and just cannot find a positive answer. Which way should a 390 CFM Holley 4 brl be placed on the offy intake? Primaries toward the engine or away? And please explain why it goes the way it does. I know that it has to sit 90* from the V8 for obvious fuel distribution. Thanks for any help.

my personal 2cents is for the street. I have ran the carb both ways Inline & 90 degrees. and i really didn't see any difference as to the performance. Mind you the Offeys carb plate only mounts 1 way. were as the clifford It can be mounted either way. But for Linkage issues It is easier to mount just like the Bent V things. I just got done making Mounting plates for the Offey so that the carbs do mount inline. This made one guy VERY happy.

Some say the Carb at 90 degree is better track wise then inline. AGAIN i have run them both ways. a(clifford) dual 450 set-up Inline and my 3x4 with 3 450 holleys Mounted 90 degree. But there is a BIG difference in intakes, AND to me My 3x4 ran Better then my clifford Dual. My ETs told me that. 14.5s down to 14.3s.

But as to mounting the primarys in board & the secondarys out bound. the secondarys do not get a chance to over Load cyl.3-4

So let me try to get this straight, when you mean inline you are saying just as if it was mounted on a V8 with the carb bowls front and back? But the with the offy I cannot mount it that way because of the plate, right? So if the secondaries are outboard they do not get a chance to load all cylinders correctly? I am sorry I am so confussed. This is my first time trying to mount a 4 brl on a inline. It is going into an old military jeep, so no track time for me. Just trying to find the best way to mount the carb so it runs and gives me decent performance on mild trails. Does offy make a 2 brl adapter? That might be a better option for me.

No need to be sorry. But yes you do now have the right idea. As far as Offey having a 2b carb plate.That Im not sure of But that is something i amd working on a templet for.Also as Im doing this I will do it as two different plates one so that the carb mounts 90degree and the Other so that it sits like the Vthings(or as a normal carb would sit on one)But there are adaptors out there MrGasket and others make them to go from a 4 to a 2b. Clifford also sells them for their intakes. But I'mnot sure that it would fit the offey. Because cliffords intakes have a different bolt patteren so that the carb can be mounted either way.

Thanks, I found your website. On your site you have a picture of the carb on the intake with the primaries toward the engine and on other sites I have found the carb mounted with the primaries away from the engine.

http://www.t6racing.org/sitebuildercontent/sitebuilderpictures/1x4pull4spacer.jpg

When i first had the offey on my 250 I too had the primarys out board Then i turned it a round to me it did not seem to make any difference. I was just stating a reason behind Primarys in board and having the secondarys out board.

And with seeing that Intake design I personaly don't think it would make a difference either way Because of the runner design.

This might help. The Offy intake has a square bore adapter on it. The only 4 bbl carbs that won't fit directly are the Quardajets or any of their copies. Either a Holley or an Edelbrock 4 bbl can be mounted in any position without an adapter. However you need to use a 1/2 inch spacer under an Edelbrock if you mount it sideways as the throttle arm will not clear the manifold. You may need one under a Holley for the same reason but otherwise they both bolt right on to that manifold.

I dissagree with that, the the distance between the bores is square, but the bolt holes on the baseplate are not.

I have the holley 390 CFM already mounted, but I am making sure it is mounted correctly. I have lots of 4 bbl carb experience, just not on the inline.

I figure I am just going to run it with the primaries toward the engine, like the ones on your sight, and call it good. This is the easiest way to hook up the throttle. Plus I really don't know if I will ever get into the secondaries that much if ever.

Larry, I can't thank you enough for all your help.

Ok just a Quick Refresher. On the offey The carb Plate WILL only Mount one way Because of its bolt patteren. The Clifford WILL mount Either way. Because the carb plates mounting holes are Square.

porkchop you're Welcome.