How does the weber 38 perform with the Aluminum Head ?

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JMB
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How does the weber 38 perform with the Aluminum Head ?

Post #1 by JMB » Fri Sep 19, 2014 6:49 pm

Has anybody tried the Weber 38 with the Aluminum Head ? How does it perform ? I want to use the Aluminum Head but also want to get the best MPG. I am in Southern California but don't know which engine builder to trust with this combination. My car is a 66 Mustang with a 200 inline 6. Thanks in advance ?

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First Fox
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Re: How does the weber 38 perform with the Aluminum Head ?

Post #2 by First Fox » Mon Sep 29, 2014 8:39 pm

A carb is really a carb as far as the head is concerned. A lot of guys have a hard time with webers because they are TOO tunable IE: the emulsion tubes, air correctors for primary and secondary sides as well as idle and main jets are tunable on these. If you are comfortable learning to tune one though, they are great carbs.

If mileage and performance are a concern you may consider a DGEV Weber which is a progressive mechnical secondary design and operates only on the primary side and the larger secondary side activates at around 2/3 throttle so they net wonderful mileage numbers. I had one if these in my Fairmont before I installed the T5 and it bested the single barrel holley by a couple MPG on the highway.
My garage:

1962 Falcon. 170/Auto.
1965 Fairlane. Twin turbocharged 289/4 speed.
1965 Thunderbird. 390/Auto.
1980 Fairmont. Turbocharged 200, 260 Comp cam/T5 and '93 Mustang steering/suspension.
1981 F-100. 300/4 speed OD. I use this primarily to haul my cars home after I modify them and they break.
1987 Thunderbird Turbocoupe. 2.3/T5. Porche designed 16 valve, twin cam cylinder head.


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JMB
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Re: How does the weber 38 perform with the Aluminum Head ?

Post #3 by JMB » Wed Oct 01, 2014 12:29 am

First Fox,
Thanks for your reply. Which carb would you use if it was you building the motor using the Aluminum head ?

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XMFalcon221
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Re: How does the weber 38 perform with the Aluminum Head ?

Post #4 by XMFalcon221 » Wed Oct 01, 2014 5:23 am

What other mods do you have planned for the engine? Cam, compression, exhaust etc? Are you going for maximum economy or looking for a decent performance increase also?

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Re: How does the weber 38 perform with the Aluminum Head ?

Post #5 by CNC-Dude » Sat Oct 04, 2014 1:09 am

Guys with 250 inch engines often use (3)40MM sidedraft webers on street cars, so (1)38 seems awful small, especially with a head like this and the potential it has to offer.
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