I intend to install this dual four setup on my 327/300 hp Ford with Turbo 350. My guestion is, where do I draw vacuum for the turbo 350 and vacuum advance for distributor. The carbs are Holley 3720SB. There are ports on the front and back. Big in back, small in front. Are these okay to draw from. In addition, im utilizing a vented oil cap in the oil filler. Is that good enough for "crank case ventilation" ?
I have Carter Compition 600's on the same intake, I use the front vacuum port on each carb, one for trans and the other carb for distributor.
Well I'll be nice to another old fart from the PNW. It doesn't make any difference in what ch***is or body and engine is in as when you are working on an engine you are only concerned with that engine and not the body or ch***is it is in. Still without checking out how long you had been here and that you are 77 and have a 51 Ford you had me wondering if you were a troll from some other group when you said that your Edelbrock carbs were Holley. That's a lot of carb for a 327 unless it has the cam and goodies to handle it though.
You could use the road draft port near the distributor with a pcv line to the carb base, along with the breather in the oil fill tube. Your engine with stay cleaner longer. There is a casting boss below the rear carb you could drill and tap for trans vacuum.
I was mistaken,, 1963/64 B-D thought sbc , the information say's with a Pontiac engine with 6 stromberg's We know what Op ment ,Ford Holley- Carter that questionable Seem's just new to Hobby or testing !
If you only have the single breather in the fill tube you'll need the pcv in the old road draft tube location hooked to the big port on back of carb.
Just my opinion but if the 327 is a good running engine it should move the Ford right along. If you want more "go" the dual 4v might get you some, or more bling for sure, but might be shooting self in foot.
First I’ve been running dual quads for almost 10 years on a relatively stock engine. Mine are set progressive linkage like all 245/270 hp SBC’s. I don’t know what the internal porting design of an Offenhauser but I installed my PCV system between the carbs using a V100 valve that was stock for the era at the back of the carbs If your block has the stock oil separator in the lifter valley with a fitting available from on of the “stock parts” sellers. You could run it off either carb if it is a primary one. If needed there is a fill tube that is sealed with a screw in PVC valve used on the early Z28’s. 300hp 327’s in 62/64 used single Carters so using 2 properly jetted will perform and run fine. The trans modulator needs engine vacuum and vacuum can on the distributor “can” use either Venturi or engine. Mine happens torun and idle better on venturi. Good luck.
I kinda figured what you were getting at. That setup will look great on your 327, should run fine if set up right. It looks like a very clean swap meet find, do you know the history of the carbs? Were they professionally rebuilt? Are they both 3720sb? I would check to see that they both have the stock jets and metering rods, first thing. Verify that the float settings are correct. Check the idle mixture screws to be sure that they are the same and adjust them equally to 1 1/2 - 2 turns out. Then you have a good chance of it starting and running and a good baseline to tune from. Others have addressed the vacuum question, Good luck.
My '57 318 came from the factory with dual Carter four barrels. They were small carbs, and I believe they were only 325 cfm each. With an Isky cam and headers it ran real nice. Do you know what cfm the carbs are?
Where did the above L79 get its “flowthru” air for the PVC system. They had sealed rocker covers up until GM choose to put a breather oil separator in the cover.
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