Do the threaded holes that the head bolts bolt into lead to coolant or oil? Wanted to know because after I cleaned them a lot of crap fell down them and I wanted to flush the appropriate system.

 

They penetrate directly into the water jacket. Use some sort of non-hardening sealer on the threads of the bolts, and under the heads, otherwise you will have coolant leaking into the crankcase. I usually use Permatex 300 (brown gooey gook); others use PST pipe sealer, etc. DO NOT use silicone, it will tear as the parts move from expansion and contraction, and leak.

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"So many Mustangs, so little time..."
ICON Motorsports

 

That was the answer I was hoping to hear. One more question do all the holes between the head and the block lead to the water jacket or are any of them oil?

 

All water.

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"So many Mustangs, so little time..."
ICON Motorsports

 

Some of the holes lead to the crankcase for oil to return from the valve train. I can't remember how many.

 

Nope, the holes in the block only lead into the water jacket. The drain back holes for the oil drain into the lifter valley.

 

No holes go into oil. None are even blind. All 17 on each side go into water.

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"So many Mustangs, so little time..."
ICON Motorsports

 

ahem, bowtie blocks have blind holes.

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85 IROC 350 11:1keith blacks,.555lift erson roller cam,1.5 crane roller rockers,edelbrock intake,holley 4150 750dbl pumper, nitrous oxide,full length heddman headers,true dual exhaust, 11"stall converter, 700R4, 3.73 locker

 

My apologies. I must have been thinking of something else. Like was said, the oil returns empty into the lifter valley.