Overheating Issue

[ronstory]

The heads can often get a bit of blockage in passages between the block and head. I couldn't tell from the pic, do you have diverter valve on coolant line into the thermostat housing? You may be sending most of the cooling water directly to the housing and then exhaust manifold, bypassing the block and heads.

What is the temp at the ends of the exhaust manifold? ... and can you shoot the block as well?

[MarkVon]

Thanks Ron.

I do not have a diverter valve on the coolant line into the thermostat housing.

The block is approx 15 degrees cooler then the head. I didn't shoot the exhaust housing, but it has been fine when I've tested it in the past.

[ronstory]

Well, a crazy experiment would be to clamp off the hose between the side port to the block and the thermostat housing and remeasure. I've had success with these:

https://www.amazon.com/gp/product/B01CRKCF3U/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Works great when you want to bleed a system where the hose layouts are sub-optimal to gravity, and you need to rebalance flow.