Seriously thinking webers. Weber guys -your feedback

[Excaliber]

When you only have a 17 gallon tank, mpg beomes an issue for range!

[67FEfastback]

Hey, thanks a lot guys. A lot of good information to help me make an reasonably informed decision. (buying webers, probably is partly emotional) - it most certainly does not make common sense!

I would not mind considering an MPEFI system, but it would have to look like a traditional early efi. I am trying to be fairly retro, where I can.

Now I just gotta explain the the other half, why cutting my gas mileage in half is a good thing.

[RICK LAKE]

Full Throttle Al Al the math will not add up. 48 mm webers have a bore of 1.89", about 1 7/8". 58MM are 2.3". I have seen and been told that the 58 manifolds are nothing like the 48mm. You can use a 48 manifold and make a 58mm fit on it, but there are going to be a bolt pattern change and the mounting surfaces are too small without filling in the edges of manifold. I am not sure what Gene is maken now but 1/2" different in size is alot unless the base plates are being made small. I guess it depends on where you are measuring the carbs, top or bottom. Even the TWM's are not quite 58mm. I have measure the bores and plates, more like 56mm. The tops are 58mm. Dave S is the only I know running 58mm, back in the late 60's there where only about 20-30 manifolds built for the 58's. This is the info I have found and recieved. These are also Cam-Am carbs. Gene may have changed the bodies since then. I have learned that size stated is not always the same size found out. Rick L.

[Stentor]

Originally Posted by RICK LAKE

Full Throttle Al Al the math will not add up. 48 mm webers have a bore of 1.89", about 1 7/8". 58MM are 2.3". I have seen and been told that the 58 manifolds are nothing like the 48mm. You can use a 48 manifold and make a 58mm fit on it, but there are going to be a bolt pattern change and the mounting surfaces are too small without filling in the edges of manifold. I am not sure what Gene is maken now but 1/2" different in size is alot unless the base plates are being made small. I guess it depends on where you are measuring the carbs, top or bottom. Even the TWM's are not quite 58mm. I have measure the bores and plates, more like 56mm. The tops are 58mm. Dave S is the only I know running 58mm, back in the late 60's there where only about 20-30 manifolds built for the 58's. This is the info I have found and recieved. These are also Cam-Am carbs. Gene may have changed the bodies since then. I have learned that size stated is not always the same size found out. Rick L.

Rick,

I confirmed with Berg today--their 58 mm IDA carbs do fit on a standard manifold for 48 mm IDA Webers (according to Berg--the industry standard 48 IDA bolt pattern and dimensions are maintained so they fit all 48 IDA manifolds without modification or adapters including V8 applications).

Here's a picture that Al posted a while back that compares the Berg 58 mm IDA with a Weber 48 mm IDA.

[IMG][/IMG]

I am going to try to make the standard 48 IDA FE manifold work for the Berg 58 mm IDAs (since I've been told by multiple parties that it should work). I will know shortly and will let you guys know. If the standard manifold won't work I will have a custom manifold built.

Best,

Stentor