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I want to go with an aftermarket carb but keep my spreadbore motorcraft style manifold. Which is better 4 hole or open? I don't want to lose too much torque the truck will be mostly hauling/towing.
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I would go with the four hole. It will keep the mixture velocity high for more torque and better throttle response. -
I agree with mrclean, the 4-hole has a higer air velocity, and will give you more or the performance you want. Edielbrock actually says NOT to use open adapters with performer series carbs, problably for this reason.88 GW, 4\" BDS, 33\'s 360/727/229/D44<br />47 willys PU,SOA D53/D44(no motor/trans yet)<br />59 willys PU, 226/T90/D18/D44/D27, 34-9.50 TSL\'s<br />52 willys PU, 134F/T90/D18/D53/D27<br />86 GW, 360/727/229/D44<br />59 FC-170, 226/T90/D18/D53/D27<br />85 CJ7,SOA 150/SR4/D300/D44s, 33\" TSL\'s<br />85 CJ7,AMC20/D30(292/465/205 and 14-bolt/ D44 coming soon<br />71 CJ5 232/T150/AMC20/D30Comment
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I just did a writeup on my tech page about the peculiarities of adapting other carbs to the 4350 intake:
That might help you out a bit.1987 J-20
Video projects for my J-20 on YoutubeComment
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