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stroked 340 vs stoked 360: bottom end strength
Is the bottom end of a 360 with a 4" stroke stronger than that of a stroked 340?
I would think so because the main journals are larger but I would like the opinions of those with more knowledge. Thanks! |
#2
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In my opinion, I believe that neither should be considered better or worse than each other, because you will split the cylinder wall of the block in both before the mains fail.
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#3
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Quote:
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#4
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both are just a strong as each other - the equalizer is the 2 bolt mains. to increase strength on either you need to install 4 bolt main caps on journals 2,3, and 4. you can buy the caps aftermarket and have your machine shop set up and install them.
adding the 4 bolt mains is the preferred way to compliment the 4.00 stroke but is not necessary - not required but very preferred. also i will agree with the above gentleman on the cylinder wall issue and add when it takes out a rod or a bearing - its always #3 or #6 anyway. lol |
#5
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To attest to the strength of a 360 based stroker motor(factory block, cast crank, 2 bolt caps, eagle h-beams,Ross pistons assembled by Hensley Motorsports in Tennessee, also with edelbrock heads, victor intake, and a pair of t-4 turbochargers running in excess of 10 psi of boost), the bottom end has held up pretty well. The pistons are a different story. The one weak leak in the pistons appears to be where the valve relief extends over to far to the edge and creates a very thin area above the ring land. Had 2 pistons break in that exact spot...
The bearings and crank appear to have held up very good considering the horsepower I am making. Should be in excess of 625 at the crank(run 10.90's at almost 130mph in a 3500 lb car with 3.21 gears) Sending one of the pistons to ross so we can come up with a way to thicken the area at that particular spot... I kno, custom pistons, but I feel I need to do this to keep any other dissasters from happening. Re-hone,fresh bearings and a little clean up on the battered heads with the new pistons, and she should be back on the road to punish her some more. |
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