I know this is an old post, but here is my review on these motors.
My vortec 350 now has 15k miles on it.
It runs great, but it does have a tiny drip from the rear main seal.
In Marshalls defense, I never told them about the oil leak. Im guessing they would cover it under warranty. The motor is in my work truck and I can't afford the down time of pulling the motor to have them fix it. Like I mentioned, it's a minor leak, and where its a work truck, I can live with it.
Long story short, it got my truck back on the road for half the price of a GM crate motor (although the gm motor would be 100% new, not rebuilt).
Keep in mind the Marshalls motors do not come with an oil pan or valve cover, but they do include a gasket kit.
Also, keep in mind there is a core charge.
All in all, for me, it was $1050 well spent.
1
