The 1S is much more difficult to come by and came only on the '65 Shelbys. The 2S is reproduced and readily available. Shelby put a Holley 715 on the early Shelby's and it is designed for road racing. Your particular application will affect what kind of carb you want.
This post talked about intakes. May shed some light.
Intersting...so what did they put on the '66 shelby's?
S2MS
The S1 intake has physically smaller runners than the S2 does. That is a little known fact, but true. Therefore the S2 intake will make slightly more power than the early intake does. The S2 intake will actually make some pretty good power. I will give some dyno results pretty soon on a 331ci hipo shelby engine I just finished.
The S1 intake came on some 289 cobra cars (the early 289 cobra cars had a small letter cobra intake with no S1MS number on them) as well as the 1965 shelby mustangs.
The S1 intake has physically smaller runners than the S2 does. That is a little known fact, but true. Therefore the S2 intake will make slightly more power than the early intake does. The S2 intake will actually make some pretty good power...
Another little known fact is that the late 65 GT350 R-Models used S2MS intakes due to their greater power making ability. Every little bit helped.
I understand that the R model intakes were different. Does anyone have a photograph of the racing version?
Intersting...so what did they put on the '66 shelby's?
They used whatever they had in stock.
Be carefull in buying old originals and many of the
S2MS's as well: the extreme corners had a tendency
to crack off when the intake bolts were tightened
and had to be heliarched back together. Also, where
the intake terminates a head water jacket hole,
there will be eroding of that aluminum surface.
When buying sight unseen, it's buyer beware unless
you find an honest seller or have someone trusted
enough to inspect OLD aluminum as these intakes are.
Quote from cchesleyThe 1S is much more difficult to come by and came only on the '65 Shelbys. The 2S is reproduced and readily available. Shelby put a Holley 715 on the early Shelby's and it is designed for road racing. Your particular application will affect what kind of carb you want.
Where would I find a 2S as you say it's readily available?
I have a 66 Shelby S2MS manifold and 715 carb if someone is interested. Pictures available, both in excellent condition.
904-468-0274
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