Author Topic: C6AZ-9424-M Intake Manifold  (Read 329 times)

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Offline sah62

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C6AZ-9424-M Intake Manifold
« on: September 17, 2019, 06:59:33 pm »
I just received this from Shelby registrar Vince Liska. It's a page from the Ford of Canada racing newspaper that includes a picture of the C6AZ-9424-M offset 427 intake manifold used on early 428 CJ engines for Super Stock drag racing competition.
Scott Hollenbeck
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Offline preaction

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Re: C6AZ-9424-M Intake Manifold
« Reply #1 on: September 17, 2019, 07:23:52 pm »
Good story, C6AZ-M is casting number C7AE-9425-C.
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Offline 161854

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Re: C6AZ-9424-M Intake Manifold
« Reply #2 on: September 18, 2019, 10:18:04 am »
   Scott,
      The information is partially correct. #1 the "Super Stock" engines were hand ( re built) by Wally Cartwirght at HMS in Long Beach and had Venolia ( aftermarket) pistons and a non production C8AX-D solid lifter camshaft. They also had the lite weight ( non production ) valves. Yes the sidewinder was used on them. These IMHO would have to be considered "day 2" mods . Super Stock had far more liberal rules than stock including the use of wider tires , where stock was limited to a seven inch wide tire.
     The sidewinder was never a "production" intake . They were OTC only.
    Randy
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Offline 70cj428

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Re: C6AZ-9424-M Intake Manifold
« Reply #3 on: September 19, 2019, 08:49:33 pm »
Hi Randy, do you happen to know which sidewinder casting number the SS cars were built with ?  I've been told it was the C6AE-9425-K but can't confirm it. 

Any thoughts ?
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Offline 161854

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Re: C6AZ-9424-M Intake Manifold
« Reply #4 on: September 20, 2019, 10:22:52 am »
    It's been too long for me to remember . I wasn't real part number focused back then but remembering the carb was offset sticks in my mind. Super Stock rules weren't as strict on manifolds like the stock classes were. IIRC there were "some" variants of the sidewinder done for Nascar which had the "regular" part number on them. Drag Council cars didn't always run "over the counter" parts as we all know.
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Offline stangperformance

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Re: C6AZ-9424-M Intake Manifold
« Reply #5 on: September 20, 2019, 11:35:38 am »
I don't have any documentation but I was told by an old time Ford racing guy that raced a Thunderbolt car back in the day out of Milton Florida. That Ford racers were having problems with maybe running lean on cylinders 6 and 7 maybe and Ford corrected that with the Sidewinder design. I was always told that that was the better performing intake to run on the 427s and 428s with a 2" open spacer to help on the big end of the Qtr. mile as opposed to the PI intake.. Some of the muscle parts look up sites shows that part number to have came factory on the 427 Fairlane and Comets as well. Not sure about that but I have one I am planning on running on a 428 in my 68 Mustang. Using an oval 427 breather since it is not an R code car that I have to worry about the Ram air not working because of the offset. Naturally on the sure enough race cars that could, were running the Medium and High riser 2x4 intakes on the big stroker engines. I think its a very good intake to run if you don't have to worry about Ram Air and originality. The one I have now is a C6AE-9425-K. I cant remember the number on the one we ran on our Mustang back then I just remember it was a Sidewinder with the offset.
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Offline 161854

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Re: C6AZ-9424-M Intake Manifold
« Reply #6 on: September 20, 2019, 12:57:23 pm »
   The sidewinder was developed for circle track use at tracks like Daytona . G forces DID cause some fuel distribution issues and the manifold was developed to curb the issue. Again , never installed on an "assembly line" engine that went into a production car. Fairlanes used "centered" carb location intakes.
68 1/2 CJ FB San Jose white/blue "C" stripe Foulger Ford
 66 GT350 Hertz SFM 6S 477 white/ blue side stripes 1  of 18
3 magazine covers- Car Craft July '77,  Modified Mustangs Feb '11 , and June '14 Mustang Monthly
'78 F350 Oleynik racecar hauler

Offline ssmustang

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Re: C6AZ-9424-M Intake Manifold
« Reply #7 on: September 21, 2019, 01:54:53 pm »
Hello all: I am attaching a couple pages from an Alex Walordy article Tony did back in 71. He talks about the sidewinder and the perceived benefit back then. The Mustang still has the sidewinder on it today, (J).

Bob

Offline stangperformance

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Re: C6AZ-9424-M Intake Manifold
« Reply #8 on: September 21, 2019, 05:10:38 pm »
Thanks' for sharing, That's interesting what they were doing with the manual vacuum advance control. Just think about how far things have came now with all of the electronic and computer assisted tuning control for these super mods and match racers.
Building 68 R code 4 speed 4:30 Acapulco Blue
68 black pro street modified  "Trojan Horse"
68 J code fastback Red on Red