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65/66 Shelby 289 block...

General engine tech -- Drag Racing to Circle Track

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thomas butt
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65/66 Shelby 289 block...

Post by thomas butt »

Did the 65/66 Shelby GT350 or AC Cobra come with a four bolt block? A guy selling a car says he has a four bolt Shelby block in his car.
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Re: 65/66 Shelby 289 block...

Post by SupStk »

Never heard of it. Take a look at any ‘65 and later 289 block, there is no material to accommodate 4 bolt caps. The 271 hp engine (K code) had thicker caps from the factory.
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Re: 65/66 Shelby 289 block...

Post by thomas butt »

Thank you for that. I had never heard of one and when I googled ‘4 bolt Shelby 289 block’ nothing came up.
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Re: 65/66 Shelby 289 block...

Post by 1972ho »

He might just have one of these SK or XE blocks in it if so it’s a pretty rare deal.
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Re: 65/66 Shelby 289 block...

Post by PackardV8 »

He might just have one of these SK or XE blocks in it if so it’s a pretty rare deal.
So rare I was there in the day building SBFs and never, ever saw one.

All the '65-'66 Shelby GT350s and Cobra 289"s I ever saw came with standard K-code HiPo 271hp Ford 289" with a Shelby aluminum intake and rocker covers. And yes, all K-codes had the nodular iron two-bolt main caps. IIRC, the first production 4-bolt small block Ford was the '68 Boss 302"; which BTW I never saw used in Shelbys or Cobras.
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Re: 65/66 Shelby 289 block...

Post by 1972ho »

I’m just saying someone could have found one these blocks some time ago and put it in the car,not saying it’s original to the car.
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Re: 65/66 Shelby 289 block...

Post by thomas butt »

1972ho wrote: Tue Jul 09, 2019 5:52 pm He might just have one of these SK or XE blocks in it if so it’s a pretty rare deal.
He is giving me a part number of C5AE-6015E for the block
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Re: 65/66 Shelby 289 block...

Post by Rick! »

I mechanically restored a 64 289 4 Weber Cobra and serial number 051 65 GT350 and neither had 4 bolt mains.
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Re: 65/66 Shelby 289 block...

Post by 1972ho »

That is the casting number for a HIPO 289 2 bolt block should not be 4 bolt main.
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Re: 65/66 Shelby 289 block...

Post by thomas butt »

1972ho wrote: Tue Jul 09, 2019 7:39 pm That is the casting number for a HIPO 289 2 bolt block should not be 4 bolt main.
Ok. Thanks for that. I read that the hi po 289 blocks were inspected for cracks so they Had fewer imperfections
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Re: 65/66 Shelby 289 block...

Post by Krooser »

Talking about rare blocks...

My son built an F100 with a 289 Hi-Po engine from a '65 Mustang.

When he opened it up to take it to the machine shop I took a look and the lifter valley had a cast logo for the Waupaca Foundry. Back then they were small but now are the world's largest grey iron foundry.

I knew the top two guys at WF so one day I asked the head honcho (who had been there since the 60's) how many 289 blocks did you guys cast for Ford? He said they never made any engine blocks for Ford. I showed him a photo of the logo... he shook his head in disbelief. Said he could never remember doing those blocks.

I had heard of those four bolt castings back in the late 60's... never saw one. We ran a hi-po 289 for two seasons in our dirt sportsman in the late 60's... ran faster then our H-M 427's....

I also have a 318 Mopar from the mid-70's with the IHC logo on it. When I bring that thing up to Mopar purists I get the same dumbfounded look as I got from Gary at Waupaca Foundry.
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Re: 65/66 Shelby 289 block...

Post by Kazoom »

have close look at block in pic ...

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