MILD THUNDER

iTrader: (3)

I believe the larger bore version is the same way. 1047 is the same as the marine 17048 gasket just different packaging

Panther

If using the 17046/48 style gasket I recommend spraying the gasket with Hi-Tack. It seems to help with sealing the lower water passages and there's less seepage down the side of the block.

mike tkach

iTrader: (3)

i have used the 17046 many times with great results.i never use any sealant on them.just stating my experiance.

sutphen 30

i used to do that,a long time ago.now I just cometic gaskets,,problem solve.plus deck surface RA is critical.

actionmarineguy

Still no answer?
Called cometic, they said the same gasket is used on all 3 gen of big blocks with no modifications, I don't see how that can be

Also checked the head contact at fire ring, Good tip.Thanks

sutphen 30

you can still get the mark4 head gaskets

sutphen 30

does look like they have a 1 size fits all.

actionmarineguy

Thanks
But still not sure if you have to drill holes in block or not? as described by fel pro

All gaskets I find have either one hole or two holes in the end of the gasket for the mark IV

All new gaskets have holes between the cylinders under the head bolts where they tell you to make the hole

My old gaskets had two holes on the end and No holes under the head bolts between the cyl.

My best guess is to make the holes in the block as described by fel pro. Hope this is not a mistake

MILD THUNDER

iTrader: (3)

I have mark iv blocks with dart aluminum heads. I never drilled any holes. I've used the felpro 1071-1 , cosmetic C5329-050, and victor reinz solicor head gaskets on these engines with no issues.

sutphen 30

drilling of the 3 lower holes is for really early blocks.very noticeable when the head gaskets are put on.