Quote:
Originally Posted by oneshotkyle
Motortrend/engine masters did a BBC long rod vs short rod dyno comparison on a episode. It pretty much did barely anything as far as power.
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Exactly. Any measurable difference would probably be within the margin of error between the two dyno runs. Now, if you're building a 16,000 RPM F1 engine, that's another story!
And the only reason to build a 355 instead of a 383 would be budget considerations, like when you already have a good 350 crankshaft, damper, flexplate/flywheel, etc.
My preference would be a 383 using 5.7" rods. Something I don't like about 6" rods is the oil ring pack running through the piston pin bore. Maybe that's not an issue, but it just goes against the grain (and my brain).
When I worked part time for an engine shop, most of the 383s we built used 5.7" rods, some making well north of 450hp on a dyno.
If you do go with a 383, be sure to read all you can find about relieving the block to clear the rods. Also, make sure to use the proper rods like these to clear cam lobes.
https://www.scatcrankshafts.com/prod...rods-arp-7-16/
And I'd recommend buying a balanced assembly from SCAT or Eagle.