Thread: Some problems with my 406

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Me too...you have missed matched parts...As it sits you are very possible over 10:1 compression ( dished are closer to 9.2:1) as for oil pressure I think the compression coupled with the HV pump is the problem....Switch to a non HV pump....with a HV pump you are moving oil to fast thru the engine to disapate the heat thouroughly thus keeping the heat suspended in the oil....The hotter it is the thinner it gets.... add compression heat and your having a double whammy....the oil just can't take that kind of abuse..... simple solution....OIL cooler and/or head gasket shims....

There are many solutions here..... maybe a bigger cam to bleed off some low-end pressure....but you need to know the exact static compression.....

Neither a stock pump or a high volume will have any pressure at an idle with oil thinner than water nomatter what bearing clearances you have...... use a oil temp gauge and try to post the temps......