Quote:
Originally Posted by Lattimer
Definitely a better engine, 1 piece rear main is a vast improvement. It will require a different flywheel and balancer than the other engine. Also different manifold. Very similar to what I am running. I just have the vortec heads with the bigger valves.
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It's called an "external" balanced engine because it's a 1pc rear main seal, so a 2pc rear main seal crankshaft has a balance weight hanging off the end and they removed that to facilitate using a 1pc seal thus a counter-weighted flywheel.
The front of the engine is not affected and takes a regular balancer.
Production Vortec 350's (L31's) take a shorter balancer due to crank sensor, those are the ones with plastic timing covers and reluctor wheel between the lower timing gear and the balancer.