check the water hose from oil cooler to water pump if there is no spring in them they could be colapsing

my engine did same changed hose runs cool now

is there a scan tool that will? thanks

will a actron auto scan cp 9185 hook to and give a read out for a 1996 454 marine power engine . if so where do you hook it up thanks for any info

iam haveing same problem same engine done all you did . had the timeing set also was told to put a clear hose from cooler to riser to check to see if it has air bubbles in the water .got the hose...

there is only one hole in it that should not be in it . it is in the third chamber . it is corrison burn thru .i have a new manifold to replace.
also riser thanks for answering

i have a 1996 454 mp thought i had a manifold gasket leak .pulled manifold
found no gasket . looked futher and found a hole in manefold this is fresh
water cooled . why no gasket? also why would...