Originally Posted by fantastic88
Isn't the L36 FWD different than the L36 desighned for RWD. If so, what are the differences.
No, they are the same basic short block regardless of FWD vs RWD use. They both are based on the same block casting. Only differences are between the L67 rotating assembly and the L36 rotating assembly. I thought that the Camshaft grinds might be different, but every place I have looked up replacement cams lists the same Melling MC1292 roller cam as a replacement for both N/A FWD and RWD motors..as well as the */C L67. If someone cares to look up GM part numbers and post them, that would be great.
In a Long Block state, the differences are:
Entire intake manifold - RWD motors have a manifold with the TB on the Accessory Drive end of the motor. FWD motors have the TB on the Bellhousing end of the motor. All the FI related components are also different because of the manifolds.
Valve covers - Same design, but the RWD ones for the F-Bodies are die cast metal vs. Composite. Doesn't mean much, but is can be handy if you want to modify them.
Oil Pan - FWD motors have a rectangular pan with the drain plug on the left side of the motor (rear when it'* in the car.) RWD motors have a pan with two large notches taken out of the bottom of the pan. One allows the motor to clear the crossmember, the other allows the exhaust Y-Pipe to cross under the motor. The drain plug is also on the centerline of the motor at the bellhousing end of the pan. In a RWD installation, the motor is angled slightly towards the rear, so the drain plug is positioned at the lowest part of the oil pan. FWD motors sit level in the mounts.
Harmonic Balancer - Three different flavors: Single serpentine belt for the RWD motors, Single with enough metal for a double row for L36 FWD, Double belt row for L67.
Oil Filter Boss - RWD motors need to clear the crossmember, as well as the power steering rack. So the filter boss points straight towards the front of the car. The fitting for the oil pressure switch is also moved above it. (In an F-Body, the engine bay is ultra-tight fitting to the motor..hanging the oil pressure switch off the side would probably hit the fender well)
Here'* the two side-by-side: