Hello,

I am wondering how compatible a late model cylinder head is with an old M103 block. I currently have an 86 M103 3.0 motor sitting in my garage that I plan to throw into a 201 as an upgrade. But smog requires me to have a functional smog pump to pass visual inspection. The 86 M103 does not have a port on the cylinder head for smog pump.

I'm wondering how compatible a late model head with smog pump is against the old block? Is it pretty much bolt on and it works? Or are there some significant differences I need to pay attention to?

Or is it not worth it in the end and I should find a proper late model M103 3.0 with smog pump?

Thanks in advanced.