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Author Topic: 289 HIPO #5 Main cap.  (Read 1021 times)
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Charles Griffith
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« on: February 15, 2017, 01:33:28 PM »

I have a 289 hipo with a #5 main cap identified as  (C30  E-A).  Until recently I thought this was how all hipo  #5 caps were identified.
What makes me question this is the fact that the other hipo #5 cap has the same identifier as the lopo #5 cap. (C20  E-B)   There is no doubt in it  being a hipo cap either.  Is there anybody out there that has seen any identified this way?

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acman63
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« Reply #1 on: February 15, 2017, 03:53:29 PM »

My gut feeling on this is that the C2  cap is a standard cap,  they look very similar.  C3OE  cap is machined flat towards the rear.  C2 is not

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gt350hr
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« Reply #2 on: February 15, 2017, 05:28:32 PM »

I have a 289 hipo with a #5 main cap identified as  (C30  E-A).  Until recently I thought this was how all hipo  #5 caps were identified.
What makes me question this is the fact that the other hipo #5 cap has the same identifier as the lopo #5 cap. (C20  E-B)   There is no doubt in it  being a hipo cap either.  Is there anybody out there that has seen any identified this way?


            The manufacturing blueprint for the block specifies the casting numbers that are to be used for the caps. In the case of the front four caps the C3OE is on the inside ( where the bearing rides )and is machined out at line bore. The rear cap had the numbers on the outside for easier visual inspection. The rear cap with a C2OE casting number would have failed casting plant inspection. What makes you certain the cap is original?

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owner 6S477 HERTZ White w/Blue stripes-1of18-since 1974. OVER 3,500 drag strip runs made in it since then. My candidate for the "worlds Most drag raced Shelby" More added all the time.
Charles Griffith
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« Reply #3 on: February 15, 2017, 11:27:38 PM »

Thanks for the info. so far.
I really don't know if they are original.  Just know they look like the real deal.  That is except for that C20 E-B number on top of the # 5 cap.
Will look for a picture of this  cap in question.

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6S1640
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« Reply #4 on: February 16, 2017, 12:54:00 AM »

Cobra Automotive repops the 1-4 HiPo main caps.  I suspect he did not reproduce No. 5, because functionally the LoPo No. 5 cap can be used, keeping the cost down.

Best of luck

Cory

Description off their site:

Cobra Automotive’s reproduction 289 Hi-Po main caps are exact reproductions, cast and machined right here in the USA from the original Ford blueprints.  A set consists of caps numbered 1-4 with the proper style numbers and the arrow facing forward, just like the originals.  The rear main cap is not included because it is almost identical to the non Hi-Po cap and not cost effective to machine.  Our caps are cast from the highest quality nodular iron and will fit any 289 block.  Bearing bore is .020 undersize and the side registers are .010 oversize on each side for adjustment prior to line-boring.  These beautiful caps convert a standard 289 block to a Hi-Po block.  Set of four; requires final fitting and line boring.


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gt350hr
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« Reply #5 on: February 16, 2017, 08:35:40 AM »

    Cory,
       The rear cap is obviously wider and rarely fails or "walks" on the block due to harmonics.  It is also a more complex cap to reproduce and install on a different block. The C3OE cap is made of nodular iron  instead of normal grey iron. There are other caps made from cast steel too.


     Charles ,
         Careful examination of the bearing area may show a cross hatch pattern , which is another clue to the caps being replaced.

      Randy

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owner 6S477 HERTZ White w/Blue stripes-1of18-since 1974. OVER 3,500 drag strip runs made in it since then. My candidate for the "worlds Most drag raced Shelby" More added all the time.
Charles Griffith
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« Reply #6 on: February 16, 2017, 05:54:28 PM »

Found the #5 cap I was talking about.                  Top and Bottom



* 289 main caps 2 (2).jpg (47.87 KB, 354x564 - viewed 29 times.)
« Last Edit: February 17, 2017, 10:36:00 AM by Charles Griffith » Logged
acman63
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« Reply #7 on: February 16, 2017, 06:47:03 PM »

Looks legit on the shape on the rear.  Ill shoot a pic tomorrow side by side

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gt350hr
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« Reply #8 on: February 17, 2017, 08:16:11 AM »

  Flip it over and show me where the bearing sits.

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owner 6S477 HERTZ White w/Blue stripes-1of18-since 1974. OVER 3,500 drag strip runs made in it since then. My candidate for the "worlds Most drag raced Shelby" More added all the time.
Charles Griffith
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« Reply #9 on: February 17, 2017, 10:38:50 AM »

My editing skills aren't the best.  A picture of the bottom.



* 289 Main Caps 006.jpg (40.29 KB, 331x550 - viewed 49 times.)
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acman63
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« Reply #10 on: February 17, 2017, 11:33:24 AM »

almost looks to good to be a an original Ford cap

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acman63
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« Reply #11 on: February 17, 2017, 11:43:04 AM »

Heres an original C3  Hipo cap and a standard C2 cap



* Main Caps Hipo and Std side view.jpg (39.27 KB, 480x640 - viewed 50 times.)

* Main Caps HP and Std top view.jpg (42.1 KB, 480x640 - viewed 54 times.)

* Main caps side to side.jpg (44.64 KB, 480x640 - viewed 55 times.)
« Last Edit: February 17, 2017, 11:53:24 AM by acman63 » Logged
gt350hr
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« Reply #12 on: February 17, 2017, 02:48:57 PM »

My editing skills aren't the best.  A picture of the bottom.

      That cap has been line honed . Probably at the same time the front four caps were added. looks like they cut it for a one piece seal too.
     Randy

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owner 6S477 HERTZ White w/Blue stripes-1of18-since 1974. OVER 3,500 drag strip runs made in it since then. My candidate for the "worlds Most drag raced Shelby" More added all the time.
Charles Griffith
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« Reply #13 on: February 17, 2017, 03:04:07 PM »

Jim,   
Good side by side pictures.  For many, this is old information.  I'm also guessing a few out there never had their engines apart.
Learning a little more every time I have this forum on.  The cap with C30E-6329-A is new to me.  I'm including a picture of a cap from a 1965
eng. I had apart last yr.

Thanks everybody who added to this.  A lot of you guys really amaze me with your knowledge.
Lets all drop our oil pans and ck what caps we have!!! Hysterical





* PA152663.jpg (54.19 KB, 800x416 - viewed 44 times.)
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acman63
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« Reply #14 on: February 17, 2017, 03:11:56 PM »

Jim,   
Good side by side pictures.  For many, this is old information.  I'm also guessing a few out there never had their engines apart.
Learning a little more every time I have this forum on.  The cap with C30E-6329-A is new to me.  I'm including a picture of a cap from a 1965
eng. I had apart last yr.

Thanks everybody who added to this.  A lot of you guys really amaze me with your knowledge.
Lets all drop our oil pans and ck what caps we have!!! Hysterical

This Hipo cap came off a very early 5 bolt engine.   


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