More information is needed. Please restate your question with specifics about the type of manifold, fuel delivery system, and carburetion. Also explain why you think the rear cylinders are lean.
On the driver side of the motor, from fron to rear, are cylinders 1,3,5,7 On the passenger side, from front to rear, are cylinders 2,4,6,8. The firing order is 1.8.4.3.6.5.7.2
Drivers side head from front to rear are cylinders 1-3-5-7The other head front to rear are cylinders 2-4-6-8
It's lean.
The 1990 Chevy G20 has a 5.7L Small block 350 v8. So It has 8 cylinders :)
Chevy 305=5.0 Chevy 350=5.7 Chevy 4.3=350-minus two cylinders making it a V6
how do you change a rear main seal in a Chevy 350 motor
have the cylinders bored .030" oversize and fit it with new pistons.
You must mean the head not the block. Yes it can but use teflon tape.
Drivers side head are cylinders 1-3-5-7 from front to rearThe other head front to rear is 2-4-6-8
Sounds lean.
The Chevrolet 350 ci motors traditionally have 8 cylinders. There are examples of race-prepped v6 motors that have been built to that size, but those are a rare and expensive item to find.
If any two adjacent cylinders have low compression it's probably caused by a blown head gasket.