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03-17-2024, 12:32 PM | #1 |
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1951 Ford F3 stroker questions
I have a 1951 Ford F3. The engine was rebuilt within 5000 miles ago. I think the bore is 3.268. I want to build either a 4.125 or 4.250 stroker. I really do not want to machine the block and prefer just to install a stroker piston with a 3.268 bore.
I will source the Eagle crank and H beam rods from CNC machine. My next order of business would be to source a 3.268 piston or have the block machined again for 3.312 pistons. Lastly, do the eagle rods require a bore notching to fit? Oh an could I get away with just using the 3.75 stroke crank, adding a cam, 2 carbs, and machining the heads for a good driver? I know when I build drag bugs that the stroke makes all the difference. As it is now, I may source the stroker crank and rods from CNC motorsports for a little over $1100 with 3/8ths rod bolts on a chevy journal What say yee for a nice running 1951 Ford F3 with Borg and Warner 5 speeds , dual Strombergs, 236 effective at 050 .355 lift, 3.73 posi. |
03-17-2024, 04:25 PM | #2 |
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Re: 1951 Ford F3 stroker questions
So it appears you have .080 over pistons - which I would think you could order an exact size to match from Ross, with whatever stroke you want. I would call Ross and ask for Ed in sales - he can help you out.
Having a longer stroke does provide more lower-end grunt - which sort of offsets the HP loss of a bigger cam . . . so I'd probably go with the stroker setup (I like spending your money!). If you can, see if Ross can supply metric rings at that bore size - I like them a lot better than the old cast iron ones we all ran for years. |
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03-17-2024, 08:31 PM | #3 |
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Re: 1951 Ford F3 stroker questions
I ended up ordering an eagle 4.250 and some Scat rods. Some chromoly coated rings that are metric would be excellent. I am fairly certain that they are .080. I cleaned the tops of the pistons when the heads were off. Then again they could be .030 over. I am almost certain they are .080 over. If I can get the pistons, I wont have to tear it all apart and take it to the machine shop. I could just clean it in my parts washer and dingleberry hone it up.
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03-17-2024, 09:27 PM | #4 |
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Re: 1951 Ford F3 stroker questions
I seriously doubt with that stroke that the rods are going to clear the block without some grinding using that bore size. I built a 4.250 stroker using Scat crank and rods and the rods just barely cleared with a 3 5/16” bore.
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03-18-2024, 07:26 AM | #5 | |
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Re: 1951 Ford F3 stroker questions
Quote:
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03-18-2024, 08:26 PM | #6 |
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Re: 1951 Ford F3 stroker questions
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03-19-2024, 08:00 AM | #7 |
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Re: 1951 Ford F3 stroker questions
Yes, you could just throw it together . . . or you could have the whole rotating assembly balanced. Given this is all aftermarket stuff, the internal balance of the whole system is probably way off. I would have the rotating assembly balanced - no matter which piston size I ended up with.
Also, even though two pistons are marked the same for overbore - with one being a cast piston and another a forged piston, you really need to know your piston to cylinder wall clearances. They need to be correct for the type of piston you'll be using. |
03-20-2024, 11:27 PM | #8 |
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Re: 1951 Ford F3 stroker questions
I cancelled the china crank order. I found a 4.125 stroker Merc crank that has already been ground and plugged. I do have to buy Scat H beam rods. What pistons should I get.
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03-20-2024, 11:28 PM | #9 |
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Re: 1951 Ford F3 stroker questions
.080 over
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03-21-2024, 12:11 AM | #10 |
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Re: 1951 Ford F3 stroker questions
If your pistons are good, go with 'em. If you need new ones, I'd go to .125" over (3 5/16" bore).
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03-21-2024, 09:00 AM | #11 |
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Re: 1951 Ford F3 stroker questions
51 Ford
I aume this is blown or fuel engine ? better use 4 bolt main caps. Gramps |
03-21-2024, 09:21 AM | #12 |
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Re: 1951 Ford F3 stroker questions
I am just doing a low compression stroker. I have seen much of your excellent mechanical advice, but I have yet to hear anything related to a flathead 4 bolt main. Anyways, it will just be a low compression stroker with Merc cam and 74cc heads.
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03-22-2024, 12:55 PM | #13 |
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Re: 1951 Ford F3 stroker questions
What's the application? that's a lot of money here!!! I'm in the process of building a 258, hi compression engine for the hills of vermont shoule have a lot of low end torque get good gas mileage, last forever and cost less than 3K
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03-23-2024, 09:56 AM | #14 |
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Re: 1951 Ford F3 stroker questions
It is a nice torch red 51 F3. It is getting the following so I cn at least drive it into town here and there.
1. Ford explorer disc brake rear end 3.73 2. speedway front disc brakes 3 brake booster 4. dual strombergs 5. Borg and Warner 5 speed with adapter 6. 4.125 stroke crank' 7. H beam rods 8. Icon pistons 3.313 9. Delta camshaft 236 355 lift 10. Edelbrock heads 11. new valves, guides and springs I will set the compression at about 8.5 to 1 It currently has a stock engine with between 10k and 20k that really just needs a cleaning, block surfacing, valve job, rings and bearings. I could leave it stock except for a nice cam and higher compression. It would have headers and dual strombergs with Mallory ignition. But, I have the crank. Part of me wants to just cut it for Speedway 3.750 stroke pistons, valve job , and a delta Cam. I want the 4.125 stroke so I can pull 5th gear on the highway. It wont see RPMs passed 4500 to 4700 max. I will have between $3500 and $4000 into parts and machining. Last edited by 1951 Ford F3; 03-23-2024 at 10:02 AM. |
03-23-2024, 03:28 PM | #15 |
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Re: 1951 Ford F3 stroker questions
?????
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