Author Topic: Casting numbers on HiPO heads?  (Read 2362 times)

6S1568

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Casting numbers on HiPO heads?
« on: June 10, 2018, 09:04:13 PM »
Can anyone tell me the meaning of the numbers 19, 20, and 21 that are found cast into the corners of the HiPO heads. I've seen combinations of these on some engines while others seem to have identical numbers on each head. Thanks.

http://www.saacforum.com/gallery/156-100618205921.jpeg

J_Speegle

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Re: Casting numbers on HiPO heads?
« Reply #1 on: June 10, 2018, 10:18:47 PM »
Don't know if that has been discovered yet. May be an identification of the mold (mold number) and nothing more.
Jeff Speegle- Mustang & Shelby detail collector, ConcoursMustang.com mentor :) and Judge

GT350Lad

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Re: Casting numbers on HiPO heads?
« Reply #2 on: June 11, 2018, 12:47:28 AM »
Yeah I just look at it and wish I was 21 again!
Ah the fun years  ;)
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Bigfoot

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Re: Casting numbers on HiPO heads?
« Reply #3 on: June 11, 2018, 09:07:28 AM »
As an after the fact detail ,.....it let’s us know 50 years later when looking at an engine in a car if the heads are HIPO.
And which aren’t.

And I’m sure most people here know that but not everyone.

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gt350hr

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Re: Casting numbers on HiPO heads?
« Reply #4 on: June 11, 2018, 12:40:57 PM »
  Jeff is right it's the mold ID number the foundry used , nothing more.
Celebrating 46 years of drag racing 6S477 and no end in sight.

6S1568

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Re: Casting numbers on HiPO heads?
« Reply #5 on: June 11, 2018, 02:40:49 PM »
Thanks Jeff and Randy. So I take it that there's no correct foundry number for left or right head, and there's no correct pairing of the numbers 19, 20, and 21. It was all random as to what ended up on an individual motor. Thanks.

gt350hr

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Re: Casting numbers on HiPO heads?
« Reply #6 on: June 11, 2018, 05:44:26 PM »
  That would be absolutely correct. They don't even have to be the exact same date! "Some" are , others aren't. The largest spread "I" have seen is two weeks on an unmolested original engine . Cylinder head sub assemblies were machined and pre assembled in a different area of the engine foundry and sent to a holding area . There is a great video on you tube that shows how engines were assembled. It isn't 289 specific but you get an idea of how things were done and how fast the pace was. These engines were not assembled "with loving care" over several cups of coffee . There wasn't any time to set back and marvel what you just built like we do now.
   Randy
Celebrating 46 years of drag racing 6S477 and no end in sight.

Bigfoot

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Re: Casting numbers on HiPO heads?
« Reply #7 on: June 11, 2018, 06:13:04 PM »
Making me think about Kiwi building his 289.....
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6S1568

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Re: Casting numbers on HiPO heads?
« Reply #8 on: June 11, 2018, 08:09:03 PM »
Randy, thanks for the follow-up information, I appreciate it! Denny

gt350hr

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Re: Casting numbers on HiPO heads?
« Reply #9 on: June 12, 2018, 10:18:09 AM »
Making me think about Kiwi building his 289.....

   Yes like the look on his face when we took the heads off and found the engine was .060 over! He thought it was standard because it never ran hot and "everybody" knows .060 ever engines run hot. It was the first engine he rebuilt on his own.
Celebrating 46 years of drag racing 6S477 and no end in sight.