Quote:
Originally Posted by m6-lt1
Nope. Now I will let you know the L87 has more collapsible lifters but that’s not why it revs lower. The L86 had the same amount of collapsible lifters as the LT1 but that also only revved to 6k like the L87.
The reason the 86/87 rev lower than the LT1 is simply because the intake manifold is designed to make more torque at a lower RPM than the LT1. It simply does not have to rev to make power which is what you want for a truck engine.
The main (and possibly only) differences between the L86/87 engines versus the LT1 are the oil pan, oil pump (I think), accessory routing, intake and exhaust manifolds. As mentioned before the L87 has more collapsible lifters than the L86/LT1. They are pretty much identical internally (heads, cam, bottom end).
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This is true. The longer runner intake on the truck is the main mechanical difference. The truck engine can rev to 6500 but it's losing power there so it doesn't make sense to.
The heads are definitely the same. I replaced one of mine and the part number was the same for the truck.