327 CRANK-350 BLOCK ??? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 10-20-2002, 08:53 AM
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Post 327 CRANK-350 BLOCK ???

I'M ABOUT TO BUILD A NEW MOTOR BUT NEED TO MAKE SURE I HAVE THE CORRECT PART NUMBERS FOR THIS COMBINATION. 350 BLOCK .040 327 SMALL JOURNAL CRANK WITH 5.7 SMALL JOURNAL RODS, 350 PISTONS (SPEED PRO#H617P .275 DOME). I WILL BE RUNNING DART IRON EAGLES WITH ABOUT 70 CC CHAMBERS WITH BIG VALVES...TORKER 2 INTAKE WITH 750 HOLLEY....MAINLY NEED TO MAKE SURE THE ROTATING ASSEMBLY IS MATCHED CORRECTLY....THANKS FOR THE HELP....

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Old 10-20-2002, 10:19 AM
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your rotating assembly is all wrong-the 350 block will not fit the small journal crank- 350 pistons have a different compression height than 327. if you somehow got the crank to fit the block, your pistons wouldn,t come to the top. gets about 5.5 compression ratio
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Old 10-20-2002, 12:37 PM
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BOB,
THANKS FOR YOUR INPUT....I'M PRETTY SURE A FRIEND OF MINE BUILT THE ABOVE COMBINATION USING THE 3.48 STROKE CRANK AND HAVING THE ROD JOURNALS TURNED DOWN TO ACCEPT THE 327 RODS. I KNOW HE USED THE SMALL JOURNAL RODS WITH A 350 PISTON (.125 DOME) AND THE PISTON DID COME ALL THE WAY TO THE TOP. THIS MOTOR REALLY HAD GOOD TOP END POWER BUT HE'S NOT A FRIEND ANYMORE SO I CAN'T ASSK HIM...????? ANY OTHER CLUES OR SUGGESTIONS...
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Old 10-20-2002, 01:31 PM
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the main journals is where you would have your trouble...the 327 having small mains and the 350 block having large mains..it just wont fit he could have used a 327 large journal crank in a 350 block..but like bob said the 350 pistons wouldnt be right
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Old 10-20-2002, 03:19 PM
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REALLY THE ONLY REASON YOU WOULD WANT THE SMALL JOURNAL RODS IS IF YOU HAD A REALLY WASTED steel large journal crank and wanted to reuse it otherwise the large journal rods are stronger from the start. also balance would be way off
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Old 10-20-2002, 03:37 PM
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[quote]Originally posted by 2QUICK:
[QB]BOB,
THANKS FOR YOUR INPUT....I'M PRETTY SURE A FRIEND OF MINE BUILT THE ABOVE COMBINATION USING THE 3.48 STROKE CRANK AND HAVING THE ROD JOURNALS TURNED DOWN TO ACCEPT THE 327 RODS. I KNOW HE USED THE SMALL JOURNAL RODS WITH A 350 PISTON QB]<hr></blockquote>

Better check on that "pretty sure".
3.48 stroke crank, 350 pistons (meaning 4" bore) makes it a 350. I'm Pretty sure your friend just wasted a grinding stone on that crank.
350 rods have 3/8" bolts and a length of 5.7"
327 rods have 11/16" bolts and a length of 5.7 inches. What was he thinking????
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Old 10-20-2002, 09:20 PM
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if you are going to build a 350, build a 350.the only difference between a 327 and a 350 is the stroke. but,realistically speeking,your small journal crank is only a small journal crank.i don't mean any disrespect but,if you want to build any real power,use a large journal crank. for any application over 350 gee gee's you will not regret the forged crank version.remember that the large journal crank started to come out in the beging of 1968.but,if you are willing to spend the cash,you can get an after market crank done to suity your needs.
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Old 10-20-2002, 09:27 PM
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i almost forgot,the 350 pistons have the exact same compresion hieght as the 327 pistons, the only difference is the stroke. remember,bore x bore x stoke x .7853 x # of cylinders = cid
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Old 10-21-2002, 07:11 AM
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the compression heights obviously differ between 350 and 327 pistons as bob wrote.
also, (bore/2)^2 x stroke x pi x #cylinders is the correct mathematical formula for engine displacement. sorry to nitpick, but as a student of calculus it bothers me to see incorrect formulas.
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Old 10-21-2002, 10:13 AM
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[quote]Originally posted by Jason:
<strong>

Better check on that "pretty sure".
3.48 stroke crank, 350 pistons (meaning 4" bore) makes it a 350. I'm Pretty sure your friend just wasted a grinding stone on that crank.
350 rods have 3/8" bolts and a length of 5.7"
327 rods have 11/16" bolts and a length of 5.7 inches. What was he thinking????</strong><hr></blockquote>

How about 5/16 bolts. 11/16.....damned those would be strong.

Chris
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Old 10-21-2002, 11:32 AM
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I TALKED TO THE ENGINE BUILDER TODAY.....350 BLOCK WITH 3.48 CRANK-- ROD JOURNALS TURNED DOWN TO 3.25 STROKE USING SMALL JOURNAL 327 RODS AND 350 PISTONS.....THIS MOTOR REALLY DID RUN "PRETTY GOOD, I'M PRETTY SURE"...IT WAS RAN IN A #3600 lb MONTE CARLO ON A 1/2 MILE DIRT TRACK....
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Old 10-21-2002, 12:35 PM
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YOUR WASTEING YOUR MONEY ON ANY CONCEPTION OF THE SMALL JOURNAL CRANK!
they did away with them in 68 for a reason, it was in favor of the much more reliable LARGE journals
the only reason to DE-stroke a motor back then was for short track raceing, if u are driveing on the street go with the 350, its a proven monster of a power plant and repairs will be much easier and cheaper
your small journal crank would be good to keep around if u plan on restoreing an old 327 with the small journals
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Old 10-21-2002, 04:41 PM
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[quote]Originally posted by TurboS10:
<strong>

How about 5/16 bolts. 11/16.....damned those would be strong.

Chris</strong><hr></blockquote>

Damn no wonder he's using those rods

<img src="graemlins/mwink.gif" border="0" alt="[mwink]" />

Actually a small journal 327 rod uses 11/32" rod bolts.
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Old 01-21-2004, 10:01 AM
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I have a 72 Camino with a destroked 350. it has the stock crank and rods from a 307. The crank rods were polished and balenced. good set of double hump heads, ported and polished. roller rockers and good vave springs with inner-springs and a .530 lift on cam. this motor combination works great I would take it over a 350 anyday. Quick RPM's good HP. and TQ. 350 turbo trans. and 390 gears it runs like a son of a *****.
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Old 01-21-2004, 01:30 PM
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A 350 is the way to go as said before forget about the small journal crank and go with the larger 350 can put out over 500 horses if done right.
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