331 or 347 stroker?

tx2000gt · Aug 31, 2005

I didn't know 347's had a tendency to break cylinder walls...

thumper460 · Aug 31, 2005

They DONT!! the .030 over bore is pretty much normal over bore for the 5.0 !! Is someone trying to sell you on this?? or did you read it somewhere??

Just me......................

Thumper

txstang84 · Aug 31, 2005

it's not that a 347 will break the cylinder walls, but because of rod angles, the potential to wear the walls quicker is higher with a 347, than with a 331. Metallurgy and technology have come a long way, but geometry and physics have been with us from day one...they still trump technology

...but that statement will probably cause a holy war with the 347 owners anyway...

but, the debate between which is better, 331 or 347, is very much a dead horse. the 347 will make more power simply due to more cubes...but people like me will go for the 331 because of personal reasons.

in a nutshell...build what you want, whether it be a 331, 347, or a 355...but if you really want cubes in a windsor package, go with a 351 based stroker...

huRACEmentPSR · Aug 31, 2005

ive been told that a 331 is more of a roadrace motor, and 347s make good drag motors....i guess because the 331s hold up better under a long race and 347s are better for short bursts....thats just my understanding tho

txstang84 · Aug 31, 2005

making a road race motor is all in how you build it...besides having those short bursts is great for coming out of the turns and powering past people on straightaways...

5spd GT · Aug 31, 2005

The 347 won't break the cylinder wall in itself but if you have a combo pushing the potential of the block with a 331 and it "wants" to crack...well having the same combo with a 347 could push it over the edge and "crack" it.

There is a reason why they make both 331's and 347's. They both have their pros/cons. 331's - a bit more longevity or a 347 - a bit more power.

tx2000gt · Aug 31, 2005

Which has a better gas mileage lol?

Grn92LX · Aug 31, 2005

tx2000gt said:
Which has a better gas mileage lol?

Suprisingly my 93 saturn gets better gas mileage then my 347

tx2000gt · Aug 31, 2005

Wait wait, whats your mpg...on both?

bubba-dough · Sep 1, 2005

I went with a Canton main girdle on my 347. At $190 it was some affordable piece of mind.

Gearbanger 101 · Sep 1, 2005

I like the 331 set up myself.....but I'm also leaning towards a power adder in my head when I envision it.

kennebell331 · Sep 1, 2005

txstang84 said:
it's not that a 347 will break the cylinder walls, but because of rod angles, the potential to wear the walls quicker is higher with a 347, than with a 331. Metallurgy and technology have come a long way, but geometry and physics have been with us from day one...they still trump technology

...but that statement will probably cause a holy war with the 347 owners anyway...

but, the debate between which is better, 331 or 347, is very much a dead horse. the 347 will make more power simply due to more cubes...but people like me will go for the 331 because of personal reasons.

in a nutshell...build what you want, whether it be a 331, 347, or a 355...but if you really want cubes in a windsor package, go with a 351 based stroker...

Cylinder walls are being broken in 347's from cylinder to cylinder fuel variations. which is caused from the rebound of nitrous. Im with txstang84, 331 BABY!!!!

Modular2v · Sep 1, 2005

331 here

txstang84 · Sep 1, 2005

kennebell331 said:
Cylinder walls are being broken in 347's from cylinder to cylinder fuel variations. which is caused from the rebound of nitrous. Im with txstang84, 331 BABY!!!!

i was under the impression the "stories" of broken cylinder walls were either urban legend, or someone who tried to put too much power to the stock block (boost or spray), in which case, inherent imperfections in the block, i.e. core shift would most certainly be a contributor to such block failures

stangbanger94 · Sep 1, 2005

bubba-dough said:
I went with a Canton main girdle on my 347. At $190 it was some affordable piece of mind.

The main girdle is just a band aid for when you crack the block. It keeps everything together till you take it off

90mustangGT · Sep 1, 2005

Most cases of broken 302 blocks happen right up the middle, isn't that right? Of course a 347 making more power than a 331 is more likley to break the block, and if the motor's internals come apart who all knows what all is going to get broken. The only one I know of who broke the cylinder walls was the guy I got my hood and other stuff from when he ran a high lift cam on stock springs and dropped a valve, shattering the stock hyper pistons (93) and breaking the cylinder wall as well. The valve looked better than the piston.

txstang84 · Sep 1, 2005

the ones i've seen, yes-right in between the cam and main journals...

90mustangGT · Sep 1, 2005

The increased angle would cause more stress on the wall, but we know since the weak point is the middle of the block, that really ins an issue. The splitting of the block would be caused by the clinder banks being pushed against and from each other durring the strokes of the cylinders. Now the only debate now is would the increased rod angles cause more stress between the cylinder banks, increasing the tendancy to split the block under the same power levels?

txstang84 · Sep 1, 2005

makes sense...but, you don't even have to run a stroker to split the block, a 302 pushing 500hp will run the same risk

the stock 302 block is just inherently weak...the main webbing leaves much to be desired when it comes down to strutural integrity

bubba-dough · Sep 2, 2005

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