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Old 10-25-2007, 10:40 AM   #1
Ryan
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Default Flatheads 101: 21 Vs. 24-Stud



I still can't stop thinking about my time at the Tardel Ranch. Every now and then, a light will flip on and I'll remember some little tid bit that Vern or Keith taught me. This one is basic a...

To read the rest of this blog entry from The Jalopy Journal, click here.
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Old 10-25-2007, 10:48 AM   #2
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Default Re: Flatheads 101: 21 Vs. 24-Stud

THANKS RYAN!! as a new comer to the flathead scene i still have many questions! and that was one of them-thats why i love the HAMB
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Old 10-25-2007, 11:05 AM   #3
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Default Re: Flatheads 101: 21 Vs. 24-Stud

Sweet! Another thing to put in my flathead notebook! Thank You!
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Old 10-25-2007, 11:09 AM   #4
Retroharley
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Default Re: Flatheads 101: 21 Vs. 24-Stud

I never knew that. Thanks for sharing. Now I'm going to always clance at the center studs when I see a flathead engine.
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Old 10-25-2007, 11:14 AM   #5
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Default Re: Flatheads 101: 21 Vs. 24-Stud

i always thought it was the waterneck location that gave them away...?
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Old 10-25-2007, 11:38 AM   #6
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Default Re: Flatheads 101: 21 Vs. 24-Stud

Thanks for clarifying.
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Old 10-25-2007, 11:40 AM   #7
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Default Re: Flatheads 101: 21 Vs. 24-Stud

Hey Ryan that is just great info.Just two days ago I was looking at a flat head and counting the studs.It will be easy now Thanks!
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Old 10-25-2007, 11:40 AM   #8
Bruce Lancaster
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Default Re: Flatheads 101: 21 Vs. 24-Stud

They came both ways on 21's...
Probable reason for change: 21 had a stud directly below centers of bores, and boring to 3 3/16 left only a scary amount of iron between stud and bore.
I think they changed the tooling in preparation for the intro of the bigger bore engines to keep tooling as common as possible between 221 and 239.
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Old 10-25-2007, 11:52 AM   #9
pasadenahotrod
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Default Re: Flatheads 101: 21 Vs. 24-Stud

32-36 21s had water pumps in the heads.
37-38 21s had water pumps in front of block like 38-53 24s.

That stud line is a great tip to identify the stud count. Thansk for the tip.
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Old 10-25-2007, 11:53 AM   #10
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Default Re: Flatheads 101: 21 Vs. 24-Stud

21 stud/bolt hard to find speed parts and very expensive (Arm &Leg ) Were the 24 stud/bolt speed goodies are abundant and in a reasonable price range. The 24's also offer a much wider range of speed accessories.
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Old 10-27-2007, 05:42 AM   #11
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Default Re: Flatheads 101: 21 Vs. 24-Stud

Quote:
Originally Posted by continentaljohn View Post
21 stud/bolt hard to find speed parts and very expensive (Arm &Leg ) Were the 24 stud/bolt speed goodies are abundant and in a reasonable price range. The 24's also offer a much wider range of speed accessories.

If there was a market that could support this type of 21 stud venture, I'd continue with it. Tooling alone is close to $11.5 K up front.
Then you still gotta get the casting done,and machine em up. Are HAMBers game to buy if I were to take this chance.
They'd be in the same price range as the Flatty Caddy's.
If you need em. Let see what we can make?
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Old 10-27-2007, 05:59 AM   #12
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Default Re: Flatheads 101: 21 Vs. 24-Stud

Thanks

I always wondered
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Old 10-31-2007, 11:08 AM   #13
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Default Re: Flatheads 101: 21 Vs. 24-Stud

Kevin, I don't even see many in the cars anymore. Most seem to have been replace with modern iron. I would like to put one together in the future. Keep us in mind for some goodies...
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Old 10-25-2007, 12:32 PM   #14
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Default Re: Flatheads 101: 21 Vs. 24-Stud

Awesome bit of info, if you remember other tricks let us know! i require tricks and tips.
thanks
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Old 10-25-2007, 01:30 PM   #15
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Default Re: Flatheads 101: 21 Vs. 24-Stud

thats a good way to look to tell the difference. i always before just looked at the bottom of the head. 2 bolts below the bore=24stud, 1 bolt below bore=21 stud. but cool hey either way works!
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Old 10-25-2007, 02:24 PM   #16
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Default Re: Flatheads 101: 21 Vs. 24-Stud

Does it hold true a 21 stud head has 5 studs across bottom of head vs 8 on a 24 stud? xYz
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Old 10-25-2007, 03:51 PM   #17
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Default Re: Flatheads 101: 21 Vs. 24-Stud

Quote:
Originally Posted by 36Brua View Post
Does it hold true a 21 stud head has 5 studs across bottom of head vs 8 on a 24 stud? xYz
That's how I tell at a glance.
and the 5 are wide spaced,can spot it across the parking lot.
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Old 10-26-2007, 10:32 AM   #18
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Default Re: Flatheads 101: 21 Vs. 24-Stud

Very interesting.

Just wanted to throw in another interesting flattie into the mix. This is an aircooled prototype that is in Speedy Bill's museum (that place is worthy of its own feature sometime).

Thanks for the info Ryan.
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Old 10-25-2007, 03:09 PM   #19
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Default Re: Flatheads 101: 21 Vs. 24-Stud

. . . waterneck location that gave them away...?

No the 59A series (center) and the later 8BA series (front water neck) both have 24 studs (or bolt holes).
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Old 10-26-2007, 10:55 AM   #20
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Default Re: Flatheads 101: 21 Vs. 24-Stud

just more info for me to absorb. thanks for the write-up!
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