I'm trying to search for a compatible exhaust header for the '89 4G64 in my Van. It's the SOHC 8-valve version, and as far as I can tell using the Mitsu engines chart, is considered a wide-block.
The interesting problem is that the exhaust and intake ports are NOT evenly spaced. They are grouped together as cylinders 1,2 and 3,4. I can find 4G64 compatible products such as for the Mighty Max and Eclipse, but they all seem to be for evenly-spaced ports. Here's a photo of the port spacing.
(These photos were taken when I took the van for an engine rebuild last year)
Here is what the head looks like.
This was pre-rebuild. The engine's service history is not known to me, as I bought the van non-running with no service docs, but it runs great now!
So my questions I suppose are:
1. Does anyone know of a vehicle with similar head ports for which custom exhaust products are available?
2. Is there such a thing as an evenly-spaced port SOHC 4G64 wideblock head that would bolt on to the block, and what vehicle would have had it?
For full disclosure, the real reason why I am asking is that the exhaust manifold is cracked and I would like to remedy that. But since the rest of the exhaust has also been slowly melting away, I'm thinking of replacing it with aftermarket parts, such as dual Flowmasters, a cutout somewhere, etc. for the ironic racecarness.
Here is the van in all its glory.
