fill o ring grooves in block

So the cylinder O ring grooves in this block I purchased were cut oversized and over lapping. So instead of messing around with them I am going to Cometic.
Fill in grooves with? block will then be surfaced.

Kobelco wrote:So the cylinder O ring grooves in this block I purchased were cut oversized and over lapping. So instead of messing around with them I am going to Cometic.
Fill in grooves with?   block will then be surfaced.  

I have used J-B Weld epoxy, (24 hour version), for doing that because you can finish it all with just a hand body-board & sandpaper and not need to deck the block ...

It needs surfacing, so my idea is to mix JB weld (classic version of it) with real fine boring bar shavings to strengthen it. Fill grooves then surface it in Sunnen what ever the machine shop has w CBN after I file down high spots with rough cut file. Let JB weld dry for days before doing anything with it.

I've run gaskets right over open o-ring grooves. Granted, they were composite...not sure how the MLS would react but guys used to do that on purpose to help "grip" the gasket. I don't see what filling the groove is going to accomplish.

Scott Foxwell wrote:I've run gaskets right over open o-ring grooves. Granted, they were composite...not sure how the MLS would react but guys used to do that on purpose to help "grip" the gasket. I don't see what filling the groove is going to accomplish.

As long as the fire ring has enough contact area I’d agree but not knowing the bore, groove diameter and gasket diameter I’d be cautious

I have filled them with the copper wire then filed/sanded the copper down flat without resurfacing the block. This worked really well.

dfree383 wrote:

Scott Foxwell wrote:I've run gaskets right over open o-ring grooves. Granted, they were composite...not sure how the MLS would react but guys used to do that on purpose to help "grip" the gasket. I don't see what filling the groove is going to accomplish.

As long as the fire ring has enough contact area I’d agree but not knowing the bore, groove diameter and gasket diameter I’d be cautious

With BB Chev the gaskets are seldom round...had the fire ring cross right over the g roove. Never been an issue. Not sure what the concern is. If the groove was open on one end it might cause a leak but it's not. If cyl pressure gets into the groove, it really can't go anywhere.

Any issue with the surfacer cutting the JB weld?

Scott Foxwell wrote:

dfree383 wrote:

Scott Foxwell wrote:I've run gaskets right over open o-ring grooves. Granted, they were composite...not sure how the MLS would react but guys used to do that on purpose to help "grip" the gasket. I don't see what filling the groove is going to accomplish.

As long as the fire ring has enough contact area I’d agree but not knowing the bore, groove diameter and gasket diameter I’d be cautious

With BB Chev the gaskets are seldom round...had the fire ring cross right over the g roove. Never been an issue. Not sure what the concern is. If the groove was open on one end it might cause a leak but it's not. If cyl pressure gets into the groove, it really can't go anywhere.

I’d be more worried about it finding a place to burn thru

lance flake wrote:I have filled them with the copper wire then filed/sanded the copper down flat without resurfacing the block. This worked really well.

This is the most common (and most tried-and-true) method used over the decades.  It is also readily reversible with the least amount of effort.  And no decking necessary when the deck doesn't require it.

My block was o-ringed. The machine shop just hammered in the wires really good, and took a skim cut of the deck to clean it up. Worked out great.

lance flake wrote:I have filled them with the copper wire then filed/sanded the copper down flat without resurfacing the block. This worked really well.

As long as the fire ring of the Cometic gasket does not cross the copper wire you will be OK without filling or sanding. The copper is soft and just flatten out.