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My son would like to build a 327 will a 350 crank fit into the large journal 327 and what trouble will he be running into could you give him some combos

[ January 29, 2002: Message edited by: rayjo ]

[ February 06, 2002: Message edited by: rayjo ]</p>
 

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I don't know if you realize it or not, but 350 crank in a 327 block makes a 350.
400ci = 4.126"bore x 3.750" stroke
350ci = 4.00" bore x 3.480" stroke
327ci = 4.001"bore x 3.250" stroke
307ci = 3.875"bore x 3.250" stroke
*302ci = 4.00" bore x 3.00" stroke
283ci = 3.875"bore x 3.00" stroke

*used only in 67-69 Z/28

As long as the block you have is a large journal block you can install any large journal crank. I believe the connecting rods are all 5.7" and the main and rod journals are the same except for the 400. The 327 is one of my personal favorite motors, no real good reason, just 327 kinda rolls off the tongue well. They do have a good bore to stroke ratio though and I tend to associate it with allota cool cars like the Stingray, Chevy II, etc.
 

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Both 327 and 350 Chevrolet engines share the same bore, however stroke is different. A large journal 350 crank will fit into the place of a large journal 327 crank and this makes a 350 c.i.d. engine. The 350 crank has 1/4 inch longer stroke than the 327 (3.48 compared to 3.25), so when buying pistons you must use pistons for a 350 because the pin bore is located higher in the piston to accomidate the longer stroke. If you try to use the 327 piston with the 350 crank, the top of the piston will be sticking out the top of the cylinder bore almost a 1/4 inch!.
 

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I just picked up a 327 block with head numbers that say 307/327 3914660/3917290 I do not know much about this but was told that the harmonic balancer on the 327 was a thin about 1/2 unit but the one on this motor is much bigger could this be a 350 does this indicate at all what crank I have and how do I tell if it is a large journal. Thanks ed ke6bnl So Calif.


Originally posted by Studebaker:
<strong>Both 327 and 350 Chevrolet engines share the same bore, however stroke is different. A large journal 350 crank will fit into the place of a large journal 327 crank and this makes a 350 c.i.d. engine. The 350 crank has 1/4 inch longer stroke than the 327 (3.48 compared to 3.25), so when buying pistons you must use pistons for a 350 because the pin bore is located higher in the piston to accomidate the longer stroke. If you try to use the 327 piston with the 350 crank, the top of the piston will be sticking out the top of the cylinder bore almost a 1/4 inch!.</strong><hr></blockquote>
 

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Many different balancers are used on small block chevys, in the late sixties early seventies you will find many differences, the same heads 307-350 were regularly used across the line, blocks were the same, the only way to really know what you have is to pull the pan, experienced people can tell different cranks from slight appearance differences (counterweight shape etc), but get the casting no. off the side of the counterweight and any good machine shop can cross ref for you.
 

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i have a 75 vette 350, when i ran the block #'s in chevy mania, the casting was in use since 1968 and was used for 350 and 327 motors. go figure, i would like to go the other way and have the 327 like the guy said, it just sounds cool.but seriously though, they rev quicker but in the old days the ford boys didn't fear 350's but didn't want to talk about 327's. my2c mikey :cool:
 
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