What have I learned from stroke?
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From: Canyon, TX
What have I learned from stroke?
I finally got around to measuring the stroke on my 75 F250. The measurement was 4.25 (although may be off by a fraction--I did my best to measure same location at both #1 and #4 holes.)
The previous owner said it was a 428. It was not described as a CJ so I'm not even going there. I really didn't care one way or the other, the truck was in good shape and the engine looks quite good...performer intake, all kinds of other goodies in there. Runs like a champ, too.
The casting number on the block indicates it's a 74 or 75 truck engine (can't remember which), so it could be the original block that came with the truck (a 360) or another block (390) of about the same year.
I haven't checked bore (don't particularly care to pull a head) and I haven't checked the crank casting (don't want to pull the pan). So what have I learned? What might my engine be "called" at this point? A 428, a 410, or is there still more I need to investigate? I'm not selling, I just don't know what to say when someone asks.
I've read as many threads on related topics, but still need a bit of input. Thanks!
edit: Oh, yeah, I know it's an FE.
The previous owner said it was a 428. It was not described as a CJ so I'm not even going there. I really didn't care one way or the other, the truck was in good shape and the engine looks quite good...performer intake, all kinds of other goodies in there. Runs like a champ, too.
The casting number on the block indicates it's a 74 or 75 truck engine (can't remember which), so it could be the original block that came with the truck (a 360) or another block (390) of about the same year.
I haven't checked bore (don't particularly care to pull a head) and I haven't checked the crank casting (don't want to pull the pan). So what have I learned? What might my engine be "called" at this point? A 428, a 410, or is there still more I need to investigate? I'm not selling, I just don't know what to say when someone asks.
I've read as many threads on related topics, but still need a bit of input. Thanks!
edit: Oh, yeah, I know it's an FE.
Last edited by 70 Bronco TX; Jul 25, 2010 at 08:54 PM. Reason: added info
Post Fiend
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From: Sin City
My guess would be a 410, if this is the original engine. There was never a 428 in a truck, and not many 390 blocks can be bored that far. The only way you will know for sure is to measure the bore.
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410 or 428 have a 3.98 stroke, so unless your fraction is 1/4", you have something bigger.
Scat and I suppose others sell 4.25 stroker cranks, so it's possible you have a 445 if it started life as a 360 or 390 with a .030 overbore and does have a 4.25 stroke.
Since you're unsure, you can always say "beats me, but it runs good..." or something like that there....
Scat and I suppose others sell 4.25 stroker cranks, so it's possible you have a 445 if it started life as a 360 or 390 with a .030 overbore and does have a 4.25 stroke.
Since you're unsure, you can always say "beats me, but it runs good..." or something like that there....
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From: Canyon, TX
Thanks, Russ, I thought a 410 was a possibility based on some other readings, but you confirmed it. I'll have the bore checked at some point. Sad thing is the whole thing was disassembled about a month ago and I forgot to ask the mechanic to check it out. Oh, well.
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410 or 428 have a 3.98 stroke, so unless your fraction is 1/4", you have something bigger.
Scat and I suppose others sell 4.25 stroker cranks, so it's possible you have a 445 if it started life as a 360 or 390 with a .030 overbore and does have a 4.25 stroke.
Since you're unsure, you can always say "beats me, but it runs good..." or something like that there....
Scat and I suppose others sell 4.25 stroker cranks, so it's possible you have a 445 if it started life as a 360 or 390 with a .030 overbore and does have a 4.25 stroke.
Since you're unsure, you can always say "beats me, but it runs good..." or something like that there....
Hmmmm...I suppose the crank, the actual casting, is probably key as well as the bore. The measurement was definitely more than 3.98. It was probably closer to 4.30 but I went with the low end of several marks I made so now I do wonder.
But I do like your suggestion
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From: Canyon, TX
OK, I've been doing a bit more searching....let's say it's a Scat crank (4.25 stroke) and the original 360 engine (I'm leaning toward this based on block casting number). Standard bore was 4.0.
Let's say it hasn't be bored over at all.
According to an engine displacement calculator it says the result is 427.256. Hmmmmm....sounds like a 428. Maybe not the usual way to get to 428 but sounds possible??
Let's say it hasn't be bored over at all.
According to an engine displacement calculator it says the result is 427.256. Hmmmmm....sounds like a 428. Maybe not the usual way to get to 428 but sounds possible??
Last edited by 70 Bronco TX; Jul 26, 2010 at 12:45 AM. Reason: deleted something obviously wrong!
Hotshot
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From: Stanley, VA
Ford never made a crank for the FE with a 4.25+" stroke. The longest stroke from the factory was the 428 with a 3.98" stroke. IF its over 3.98" it is an aftermarket crank.
Also, the std. bore for the 360/390 is 4.05" so the displacement for a 4.05" X 4.25" engine would be 438.005 cu. in.
Also, the std. bore for the 360/390 is 4.05" so the displacement for a 4.05" X 4.25" engine would be 438.005 cu. in.
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Thanks, Mike, my mistake....the first google result said something like 4.00"-4.03" bore for the 360 and I went with the round number. Or I misread a line. But everywhere else I look now matches your 4.05" number.
What a difference a fraction makes.
Dan
What a difference a fraction makes.
Dan
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You can find out the exact cid by pulling a spark plug and filling 1 cylinder that has the piston at the bottom of the stroke with a light oil, kerosene or diesel. To do this accurately you will need a burette with cc.s indicated or a measuring cup for measuring the cc.s of fork oil in a motorcycle. After finding the cc.s of 1 cylinder just multiply by 8 and then convert the cc.s to cubic inches. Then hand crank the engine to get the fluid out before you start it. This will be pretty close for Shade Tree work.
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From: Canyon, TX
You can find out the exact cid by pulling a spark plug and filling 1 cylinder that has the piston at the bottom of the stroke with a light oil, kerosene or diesel. To do this accurately you will need a burette with cc.s indicated or a measuring cup for measuring the cc.s of fork oil in a motorcycle. After finding the cc.s of 1 cylinder just multiply by 8 and then convert the cc.s to cubic inches. Then hand crank the engine to get the fluid out before you start it. This will be pretty close for Shade Tree work.
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Years ago the NHRA tech inspectors used a device called a P&G guage to determine the size of a racer's engine instead of having the heads come off, but too many guys got around that by just boring 7 cylinders oversize and praying that the techs would only check the easy to reach cylinder. After a while the techs caught on.
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From: Sin City
Years ago the NHRA tech inspectors used a device called a P&G guage to determine the size ogf a racer's engine instead of having the heads come off, but too many guys got around that by just boring 7 cylinders oversize and praying that the techs would only check the easy to reach cylinder. After a while the techs caught on.
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I measured both cylinders at TDC on the same stick and measured the distance between the two marks. Rotor was pointing toward #1 wire on the cap....and the timing pointer was also at TDC. Correct procedure?
Last edited by 70 Bronco TX; Jul 26, 2010 at 06:29 PM. Reason: added info
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If memory serves, it was King Richard thet got caught with extra fuel in the frame or roll cage. Back then all of the teams had little tricks to get a better finish. NASCAR is a lot wiser to all that now and if a team gets caught the penalties are very severe.
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