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Author Topic:   stupid question
posted October 29, 2004 09:24 AM
ok so I've got some great forged pistons almost for free but they are for a 6.0 rod on a 3.75 crank. I cant run the stroker crank so what would happen if I ran these on a 3.48 or 3.562? I really cant run the 3.562 either but just curious.

Would it be down in the hole to much? I'm not sure what happens when you mis match combo's like this.

posted October 29, 2004 09:47 AM
perfect match for the 383 piston or to each other?

posted October 29, 2004 12:10 PM
chomme has the right idea but i think he mans 6.125 rods. The .125 longer rod makes up the difference of the shorter stroke and the piston still ends up at the same deck height. Drawback is you will lose compression over what is given for that piston with a 3.75 stroke, but otherwise it fits.

posted October 29, 2004 09:00 PM
if you want to get rid of the pistons let me know I may be interested thanks

if every thing is under control your not fast enough

posted October 29, 2004 11:39 PM
You haven't said what bore size it is, but if it's a 4.00" bore (350) you can use a 6.125 rod and you'll have a great running 350 with a really good rod ratio. you will have to cut a little more off the block to get the piston to the top, or do what I do and stroke it from a 3.480 to a 3.500 (offset grind) so I don't have to cut as much.

I use this combo all the time,and sometimes I'll modify a 318 chrysler rod and turn the crank to fit a 318 big end (these rods are 6.123).
I have found This combo makes great mid-range torque

If it's a 4.125 bore piston, the same is true, it just makes it a 377.

Either way a 6.00" rod 3.75 stroke piston works great with a 6.125" rod and a 3.48 stroke.
hope this helps.

Mark's Racing Engines


[This message has been edited by engineman (edited November 02, 2004).]