|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
03-22-2015, 07:56 PM | #1 |
Junior Member
Join Date: Jan 2011
Posts: 17
|
21 stud hot rod motor?
Hey guys , I tried to do a search but couldn't get it to work... I have had a couple later hotrod flat motors one was a 53 merc bored 3 5/16 with mild port and 400 jr. And the other is a 3 3/8x 4 1/8 ported with a 3/8 potvin ...
A couple others just stock Anyway more of a curiousity but how many have hot rodded them and whats your combo... How does it compare to a late flathead? |
03-22-2015, 08:50 PM | #2 |
Senior Member
Join Date: May 2010
Location: Gardiner Me.
Posts: 4,200
|
Re: 21 stud hot rod motor?
21 stud, the 37 21 stud is my chose, That's a nice little engine, you can bore it 1/8 to 3-3/16, put in a small cam, and Hi compression heads, and a couple carbs. Your not going to beat a pumped up 8BA like those other engine you had but in a light car there a good little street engine. They got a lighter crank and rev good. Walt
|
Sponsored Links (Register now to hide all advertisements) |
|
03-22-2015, 09:16 PM | #3 |
Junior Member
Join Date: Jan 2011
Posts: 17
|
Re: 21 stud hot rod motor?
Sounds good Walt ... I was thinking a 4" merc crank , some port work and maybe a 400jr cam or equivalent ? I actually found a post on the hamb saying the LB blocks won't take too much bore... I wonder why the castings are so thick on the later motor and not early?
|
03-22-2015, 11:38 PM | #4 |
Senior Member
Join Date: Oct 2010
Location: North Pole, Alaska
Posts: 1,470
|
Re: 21 stud hot rod motor?
There were a lot of 21 stud hot rod motors back in the early days. A lot of speed equipment made for them as well.
|
03-23-2015, 12:07 AM | #5 |
Junior Member
Join Date: Jan 2011
Posts: 17
|
Re: 21 stud hot rod motor?
Yes , I'm sure there was, I was just curious what one could expect from a "small flat motor" , I'm not well versed in all things flat but , but have experianced those two bigger flat motors a semi stock 8ba a wore out 59a and a 4-71 blown 59a ( favorite one!)
All in light roadsters, everything should be semi equal except 3 studs and bore deficiency I guess I'm kinda asking for a seat of the pants comparison or if anyone has done a big 21 stud |
03-23-2015, 12:25 AM | #6 |
Senior Member
Join Date: Oct 2011
Location: Shelton, WA
Posts: 3,800
|
Re: 21 stud hot rod motor?
Sponsored Links (Register now to hide all advertisements)
|
03-23-2015, 02:50 AM | #7 |
Senior Member
Join Date: Jul 2010
Posts: 2,593
|
Re: 21 stud hot rod motor?
The pre 37 blocks don't readily exempt big bores Luke the 37.
Pre 37 (LB and earlier) will sometimes strike water at 0.060-0.080" over. As Walt said, a 37 will normally happily go 0.125", some will go bigger still. A 4" crank needs some modifications to work, obviously you'll loose the light (stock) crank doing this. Martin. |
03-23-2015, 04:35 AM | #8 |
Senior Member
Join Date: May 2010
Location: Masterton, New Zealand
Posts: 3,834
|
Re: 21 stud hot rod motor?
E.Preuss, Whereabouts are you? If you're in New Zealand, come down to my place and I'll show you first hand how a 21 stud can go. Bring some spare undies...you'll need 'em!
__________________
Unfortunately, two half wits don't make a whole wit! |
03-23-2015, 08:26 AM | #9 |
Senior Member
Join Date: May 2010
Location: Near Rising Sun, Maryland
Posts: 10,858
|
Re: 21 stud hot rod motor?
Many a little 21 stud engine was cast aside in favor of their bigger brothers, 59a and 8ba engines, but the truth of the matter is they can be built into nice little street engines as Walt, Brian, and others have said, that will run their hearts out for you. Anybody who has ridden in my Avatar '35 Sedan can tell you how well it runs. This engine is basically stock except for 0.030" over bore and milled heads for higher compression. I'm not going drag racing with it, but it sure gets this old man anywhere I care to go and as fast as I care to get there .
__________________
John "Never give up on what you really want to do. The person with big dreams is more powerful than one with all the facts". Albert Einstein |
03-23-2015, 09:37 AM | #10 |
Senior Member
Join Date: Oct 2011
Location: CT.
Posts: 596
|
Re: 21 stud hot rod motor?
My 33 Flathead runs just great! It has been bored & balanced has adjustable cam etc.
overflow 003.jpg
__________________
A man should do what he thinks best! "The Duke" |
03-24-2015, 09:57 PM | #11 |
Senior Member
Join Date: May 2010
Location: NorCal
Posts: 2,617
|
Re: 21 stud hot rod motor?
ct1932ford
That engine looks really good |
03-25-2015, 08:34 AM | #12 |
Senior Member
Join Date: Oct 2011
Location: CT.
Posts: 596
|
Re: 21 stud hot rod motor?
Runs really good too! Thanks
__________________
A man should do what he thinks best! "The Duke" |
03-25-2015, 12:26 PM | #13 | |
Senior Member
Join Date: May 2010
Location: Near Rising Sun, Maryland
Posts: 10,858
|
Re: 21 stud hot rod motor?
Quote:
__________________
John "Never give up on what you really want to do. The person with big dreams is more powerful than one with all the facts". Albert Einstein |
|
03-25-2015, 04:09 PM | #14 |
Member
Join Date: Jan 2011
Posts: 33
|
Re: 21 stud hot rod motor?
I love mine in my 32 truck.
33/34 motor. 80 thou over with flat tops. isky 77b cam. Meyer heads and inlet. duel 97's. crab dizzy and speedway econo headers. Runs well on the street, good for 17.4 sec quarters at the drags and 87mph at Pendine. Been driven to Belgium and back as well as being used for hill climbs and track days. I'm amazed it is still together! Sure you could go quicker and faster with a fairly stock later motor but then so would a small block. On board video of one of my runs at Pendine. https://www.youtube.com/watch?v=mTfjw8haWJE Last edited by gavin m; 03-25-2015 at 04:36 PM. |
03-25-2015, 05:33 PM | #15 |
Senior Member
Join Date: May 2010
Location: Charlotte NC KiWi-L100 available here
Posts: 2,963
|
Re: 21 stud hot rod motor?
Gavin sweet pickup "Mate"
I too like them lil 21 studs. My stock 36 runs like a top , handles them Georgia Mountains with 4 adults aboard with ease during the cigar City Flatheads Moonshine Festival Cruise . I had to ask the tour leader to pick up the pace a little (239,s holding me up ) as she would pull strong in high gear but their too slow speed kept forcing me to second. Cheers KiWi-Tony |
03-25-2015, 05:34 PM | #16 |
Senior Member
Join Date: May 2010
Location: Charlotte NC KiWi-L100 available here
Posts: 2,963
|
Re: 21 stud hot rod motor?
What Camshafts are we running in our little 21 studders ?
|
03-25-2015, 05:36 PM | #17 |
Senior Member
Join Date: Jan 2012
Location: Lyman,ME.
Posts: 2,630
|
Re: 21 stud hot rod motor?
What a nice little truck!!!!...... Thanks for the ride!!!... MARK
__________________
I'm thinkin' about crankin' My ragged ol' truck up and haulin' myself into town. Billy Joe Shaver |
03-28-2015, 12:28 PM | #18 |
Junior Member
Join Date: Jan 2011
Posts: 17
|
Re: 21 stud hot rod motor?
Thanks for all the imput guys ..
.. That's a NICE little 32 truck Gavin...I like it... Thinking about doing front suspension in similar fashion , with a dropped axle on mine... Could I get pics of the back where the frame rail and tierod are and a rough measurement if you have a chance? Is anyone running a big cam or some dome pistons in their 21 stud?... Any major port work? Would it be possible to swing a 4 1/8 arm with that small of a bore? Last edited by E.PREUSS; 03-29-2015 at 01:41 AM. |
03-29-2015, 12:38 AM | #19 |
Senior Member
Join Date: Aug 2012
Location: Leicester. UK
Posts: 404
|
Re: 21 stud hot rod motor?
Niiice truck Gavin!
C'mon Brian lets have some numbers!! |
04-01-2015, 03:25 PM | #20 | |
Member
Join Date: Jan 2011
Posts: 33
|
Re: 21 stud hot rod motor?
Quote:
No problem I can get some pictures sorted. What measurement do you need? |
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|