Running dual quads on a 394
August 21st, 2015, 11:44 AM
#1
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Join Date: May 2015
Posts: 13
Running dual quads on a 394
Hi new to the forum and Oldsmobile world! I have a 64 98 that I picked up a few months back, the odometer reads 55k car runs great other than leaking a lil oil. I did a dry compression test and got 150 on all. I em thinking of running dual quads in the future and wondering if the motor will be able to take it or would I have to do other mods prior to that?? I will also be swapping to the 200 r4 as the slim Jim on this is ****.
August 21st, 2015, 01:28 PM
#3
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Join Date: Jul 2009
Location: Dallas-Fort Worth
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If the carbs are tuned correctly, should not have a problem. If the 394 is original to the car its a high compression engine anyway. If were me, I would locate a J-2 setup, much sexier! Either way you will not see much of a "seat of the pants" power gain. I would invest in the 200-4R conversion first, just a suggesion. X2 send us some pictures please.
August 21st, 2015, 03:42 PM
#5
I dont think the J-2 manifold is compatible with the later 394 blocks. There was a change in 59 and thats why no 3 2's on the 59. 58 was the last for that series engine. There are aftermarket intakes for multi carbs on these engines. A simple carb or multi carb swap will not hurt a good engine, its only the beating that may take place after some new ponies are acquired !
August 21st, 2015, 05:22 PM
#6
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Location: Dallas-Fort Worth
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Oldsmanic, you are correct brother, just when you think you know it all! The J-2 Tri-Power setup will not fit the 394. There were differences between the 371 and 394, I believe in the port sizes. The 394 intake passages are much larger. Thanks.
August 21st, 2015, 05:55 PM
#7
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Join Date: Mar 2007
Location: Northern VA
Posts: 47,361
As for the dual quads, I ran a pair of 500 CFM Carters (precursor to the Edelbrock) on a 455 with a progressive linkage. The car was very streetable and actually got 15-ish MPG in a 71 Cutlass with 3.42 gears and my heavy foot.
September 2nd, 2015, 09:22 PM
#8
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Here are a couple random pics of the olds that I have on my phone, I will upload more *** soon as I get it rolling kind of just have a bunch of parts laying around ready to be thrown in there at this point
Last edited by Ezln1688; September 2nd, 2015 at 09:50 PM.
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