stroke question
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Senior User
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stroke question
I measured the stroke in my 390 like i have read here to do. a strieght piece of wire, piston at the bottom of the stroke, wire in the spark plug hole. I carefully put the wire in, as streight as i could touched the center of the piston and marked the wire with a sharpie. i put the mark at the bottom of the spark plug threads.
its 5 inches exactly. (on #1) to the top of the threads is 5 1/4 or close to it.
I measured it 3 times, bottom of the threads to the piston surface is 5 inches on the nose.
I read it should be, for a 390, 3 3/4..
I read 5" what did I measure wrong or do I have a different engine?
does the heads make a diff? the chick said they put 428 heads on it.
?????
its 5 inches exactly. (on #1) to the top of the threads is 5 1/4 or close to it.
I measured it 3 times, bottom of the threads to the piston surface is 5 inches on the nose.
I read it should be, for a 390, 3 3/4..
I read 5" what did I measure wrong or do I have a different engine?
does the heads make a diff? the chick said they put 428 heads on it.
?????
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Senior User
Joined: Dec 2003
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Oh I see, thanks... the diference measured 3 1/2 so I guess I have a 360.
thanks for correcting me!
one more thing the owner told me that wasnt true... oh well.
it runs its paid for. i'm happy with it.
thanks for correcting me!
one more thing the owner told me that wasnt true... oh well.
it runs its paid for. i'm happy with it.
Post Fiend
Joined: Feb 2000
Posts: 5,130
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From: Brea CA
Try it again, it takes a little practice.
This time put the engine at TDC and remove spark plugs #1 and #4. Stick it in hole #1 and mark the wire, then put it in hole #4 and mark the wire again. Don't turn the engine over, leave it at TDC.
Hopefully you get a 390 now.
This time put the engine at TDC and remove spark plugs #1 and #4. Stick it in hole #1 and mark the wire, then put it in hole #4 and mark the wire again. Don't turn the engine over, leave it at TDC.
Hopefully you get a 390 now.
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a dowl rod works better, so does the 1 and 4 plug out and not moving the engine.
it's 3 3/4 every time I try it. the wire I was using last night was reading a bit over 3.5, but the pre marked dowl i dont have to mark, just look in the plug hole and make sure 1 and 4 are measured off the same spot.
cool.. I have a 390 again.
Thanks BB!
it's 3 3/4 every time I try it. the wire I was using last night was reading a bit over 3.5, but the pre marked dowl i dont have to mark, just look in the plug hole and make sure 1 and 4 are measured off the same spot.
cool.. I have a 390 again.
Thanks BB!
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