7 bolt parts on a 6 bolt

[jr7426]

I'm looking at purchasing this 7bolt configuration but need a 6 bolt for my rwd setup. what parts can be used from the 7 bolt? head? exhaust manifold? intake manifold? dry sump? any internals? thank you

 

[Kryndon]

Not many, actually. The 6 bolt head has bigger exhaust and intake ports, which means the manifolds won't fit well (there will be airflow issues). The 6 bolt crank has bigger main and rod journals. The 6 bolt pistons have a 21mm piston pin bore (22mm for 7 bolts). 6 bolt water pump, hydraulic tensioner and cambelt engine mounts are different. The oil pan mounting holes do not match up. The 6 bolt head also has bigger head studs than the 7 bolt (1mm bigger I believe).

Of course correct me if I'm wrong but this is based on what I've seen and measured.

 

[jr7426]

wow. thank you

 

[19Eclipse90]

Some of what is pointed out in post #2 is actually differences between 1G and 2G engines, not 6-bolt vs 7-bolt. For reference: 1G vs 2G.

To clarify, all 1G heads have the same size of intake ports and exhaust ports. The 2G heads also have the same (or close enough to the same) exhaust ports but do have smaller intake ports.

2G pistons (7-bolt pistons) can be used in a 6-bolt and is an extremely common upgrade for 6-bolt engines. They would be a direct swap onto 1G 7-bolt rods. See: Installing 2G pistons on 6-bolt Rods.

6-bolt and 1G 7-bolt water pumps are the same, as are the belt side engine motor mount brackets.

You really need to know what generation of engine block it is and if the head is matching that or not. These might help with that:
How to distinguish 7 bolt head, 6 bolt non-turbo head, & 6 bolt turbo head
Is this a 2nd gen or 1st Gen head
1gb 7bolt vs 2g 7 bolt engine

 

[Jack be nimble]

Use it as is.
You were saying about bolting a power glide to it. So you need a adaptor plate made. So bell housing bolt pattern doesn't matter.

Throw your 6 bolt ideas away and use this 7 bolt.

You could use the head complete on a 6bolt just ream the head bolt holes 1mm larger