Stroker 21 stud

[Pete]

Originally Posted by Ronnieroadster

Pete I would think a lot of clearance in the block would be needed for the 4.750 stroke ending up opening into the water passage was the block filled solid?
Ron

I haven't tried it with modern H beam rods. With 21A rods some grinding on the block was needed. No where near getting into water..The big problem was the extremely short skirt required on the pistons. It hurt ring life with .012/.014 clearance.

[KiWinUS]

Originally Posted by scooder

Thanks for that John, they do look sharp! If they got those patterns maybe they got the four carb manifold pattern too. That would be brilliant. I want me a Sharp four two.
Martin.

They are very "SHARP"
I dont believe Al Sharp made any 21 stud heads .
Man I love them !!!!
It will be tough for me to decide which of my Sharp intakes to run with those heads , or my "Burns" intake would also look way cool !!!

[38 coupe]

If I were having a crank welded I would start with a used crank. You are going to have to straighten and grind the journals afterwards anyway. Why do that to a new crank? What other crank are you going to find that will fit all those NOS standard bearings out there?

Allard, Tornado, and those weird waterless Federal Mogul heads are the only center water 21 stud aftermarket heads made back in the day that I know about.

edit: I meant Cyclone, not Tornado, wrong bad weather reference.

[JM 35 Sedan]

Tony, they do look very nice!! Let me know if you hear anything on the actual cost for a pair of these for pump in heads.

[Tinker]

The Eddie Meyers go for 1100. Being that there is no other heads it might be comparable. Probably a deal if you want 21 finned aluminum heads.

Downloaded h&hs catalog off thier website for 2015. Man they are really keeping flatheads going. Much respect.

[tubman]

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Originally Posted by 38 coupe

If I were having a crank welded I would start with a used crank. You are going to have to straighten and grind the journals afterwards anyway. Why do that to a new crank? What other crank are you going to find that will fit all those NOS standard bearings out there?

Allard, Tornado, and those weird waterless Federal Mogul heads are the only center water 21 stud aftermarket heads made back in the day that I know about.

In the late '50's, I had a set of Cyclone 21 stud center outlet finned heads. Try as I might, I couldn't make them work on my '36.

[KiWinUS]

Originally Posted by tubman

In the late '50's, I had a set of Cyclone 21 stud center outlet finned heads. Try as I might, I couldn't make them work on my '36.

i bet they looked alot like these heads ...wink wink ...
why would they not work ?

[JM 35 Sedan]

Originally Posted by KiWinUS

why would they not work ?

If stock '36 engine and center outlet heads, there would be no place for water pumps

[KiWinUS]

good point John , I was thinking 37 block .
Mike text me pics yesterday also , I will let you know when I get any price info.

[Ol' Ron]

I wonder if the spark plug is still in the original location? Be nice if the people that take the trouble to make these heads, would take the time to up grade the combustion chamber.

[flatheadkid1]

SCAT makes stroker cranks for the small journal 21's. Check out their part number 9-221-4000-2000.

[Brian]

SCAT makes stroker cranks for the small journal 21's. Check out their part number 9-221-4000-2000.

Thanks for that most interesting information...hmmm...now you've got me thinking.
Has anyone on here got first hand experience with the above Scat crank?

[Flathead]

With that 4.750 crank did you run the real early style rods for cam clearance etc.? Must have been tight in there. I do like big motors though.

[JM 35 Sedan]

Originally Posted by flatheadkid1

SCAT makes stroker cranks for the small journal 21's. Check out their part number 9-221-4000-2000.

That is interesting. I wonder what mains diameter you could get on these stroker crankshafts? It really didn't say in their on line catalog.

[Pete]

Originally Posted by Flathead

With that 4.750 crank did you run the real early style rods for cam clearance etc.? Must have been tight in there. I do like big motors though.

21A rods.

[flatheadkid1]

Originally Posted by JM 35 Sedan

That is interesting. I wonder what mains diameter you could get on these stroker crankshafts? It really didn't say in their on line catalog.

I called them a few months ago and they verified that part number had 2.399" main journals with a 4" arm. I did not ask if it had an oil slinger. At that time they had no stock and the price was high (don't remember exactly how much) but it may be possible to get one at a lesser price if it wasn't purchased direct from SCAT.

If a late merc crank was ground to 2.399" on the mains how would one address the oil slinger/ rear main seal. There is not enough diameter there to create the slinger. Boring the mains out to use the 2.499" bearings and using a 59A rear main cap with a seal seems possible but expensive.

[colin1928]

Slingers can be added simply by soldering

[Ol' Ron]

In the 37/38 block, Reds headers mad an adapter to convert to the rope seal, Using several Ford parts, Pretty simple