Intake Manifolds, S2MS vs S1MS

rtj_old · March 4, 2007 at 2:55 PM

Looking to upgrade the stock intake (k-code motor) to one of these units. I would appreciate some advice on the difference (performance, fit, price) between these two units and which would be easier to locate.

Also, what carb. match would be best? Presently I have a 650cfm holley with mechanical secondaries (tranny is 4-speed).

Thanks, Tom.

cchesley_old · March 4, 2007 at 7:10 PM

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.

raccol · March 4, 2007 at 7:15 PM

This post talked about intakes. May shed some light.

http://www.hipomustang.com/hpmx/topic.asp?TOPIC_ID=6263

rtj_old · March 5, 2007 at 7:13 PM

Intersting...so what did they put on the '66 shelby's?

63Kcode_old · March 6, 2007 at 11:14 AM

<BLOCKQUOTE id=quote>quote:<hr height=1 noshade id=quote>

Intersting...so what did they put on the '66 shelby's?

S2MS

BMaloof_old · March 9, 2007 at 7:31 AM

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.

s2ms · March 9, 2007 at 12:21 PM

<BLOCKQUOTE id=quote>quote:<hr height=1 noshade id=quote>

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.

noelfisher_old · March 9, 2007 at 7:37 PM

I understand that the R model intakes were different. Does anyone have a photograph of the racing version?

map351_old · March 19, 2007 at 8:41 AM

<BLOCKQUOTE id=quote>quote:<hr height=1 noshade id=quote>

Intersting...so what did they put on the '66 shelby's?

They used whatever they had in stock.

64.5 07K_old · March 19, 2007 at 8:45 PM

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.

rtj_old · March 31, 2007 at 6:20 AM

<BLOCKQUOTE id=quote>quote:<hr height=1 noshade id=quote>

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.

Where would I find a 2S as you say it's readily available?

289route66_old · March 31, 2007 at 8:53 AM

Here's one:

http://cgi.ebay.com/ebaymotors/ws/…16533&rd=1&rd=1

66-68shelby_old · April 7, 2007 at 6:01 AM

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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