I have a 1967 RB (493) that had a set of closed chamber Edelbrocks installed but decided to tear back off to clearance for the pushrods because they were just to close w/1.6's and now I noticed since it's apart that the heads have two divet areas 3/8"wide,1/2"long and about .050"deep on the outer surface which looks like it would be close to overlapping on one side of the head gasket with a cooling passage on the block, this looks like it may not compress the gasket much if any in a critcal sealing point causing coolant leakage?


Just wondering if any of you guys have seen this before and what I should do? I think if it was a later block with the dog bone shaped passages it wouldn't be a problem.
Forgot to mention I've never ran this engine yet or I would know for sure wheather it would be a leaker.


Mitch

Picture ?

Bore and Gasket really has nothing to do with it,but here is a hot link that show the two divets but the ones on my heads go in further and will overlap.I think I'll just JB it in

http://www.carcraft.com/techarticles/ccrp_0709_440_mopar/photo_12.html

If your talking about the unmachined area towards the cam side of the heads in the center of the head front to rear I cut that part of the head gaskets off even with the block so they won't rub on the pushrods If not that area which area are you refferring to ? BTW, I had to shim my rockers out away from the intake port walls and still had to grind on one of my Eddy RPM heads to get .045 clearance between the pushrod and the cylinder head on # 6 intake port outside wall using 1.6 ratio Harland sharps, no problems on the other motor using the Harland Sharp 1.5 ratio with the same cylinder heads I ended up grinding through it three times and had it welded four times before getting enough clearances to live with Good luck

Those little divits in the head casting go edge to edge with the water passage on mine. Nobody ever mentions it and I even called Edelbrock and they did not know what I was talking about. I believe the water passage is in the same location on all of the blocks. Mine did not leak.

The spot on the outside edge isn't near the bore and has two bolts right there. Looks like a non-issue and I haven't noticed any posts on here about blown gaskets. It's a certainty that a post complaining would be on hee every week if that was a problem with these heads.

I do recall concerns of this before, and I do see where your talking about.

On my EDDY heads the divot is just over a 1/8" wide. Measuring some of my blocks water ports, if your heads divot is a true 3/8" wide, your correct, that could be a leaker problem. It would seem possible that the water port could overlap the heads divot causing a lack of sealing pressure in that area.

Im measuring a average easy 3/8,s from the edge of the block to the water hole. If your divot is a easy 3/8,s then there will be a slight overlap posible on your set up. To make matters worse, when I put one of my heads on a block I measured, the edge of the head , the side we are talking about, doesnt even extend beyond the blocks outside deck. With your type setup this would make the overlap even worse.

If your setup is truly overlapping then I would say you have a problem. Id go with your epoxy idea, for on the cheap. Welding would require a head shave to true things up, but would be the more correct way to go.

Your heads make me glad that my heads arent even close to what you have. EDDY must be slipping on quality control.

I have herd of blocking a water hole with a pipe plug or set screw if small enough.I would have to see the hole to tell better.

Yes that the area that BSB67 posted and mine has a slight overlap into the water passage which is kinda oval shaped on 67 blocks,I could make it go away by decking the heads about .050

We have a scrap yard about 15 miles down the road from my house and sometimes it gets tempting to just pile it all in the back of the truck with the car loaded on the trailer and put all this crap where it really belongs

Thanks for the input though!

Mitch

If you don't want to cut that much off the head how about welding it up and doing a skim cut on the head ?

True John, I've pondered that as well

Quote:

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We have a scrap yard about 15 miles down the road from my house and sometimes it gets tempting to just pile it all in the back of the truck with the car loaded on the trailer and put all this crap where it really belongs

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Mitch...If ya do that,just keep heading west on 18..We will find a home for that scrap!!

If I do it I'm gunna cow eye it and stay there till its all shreaded that way all the bad energy wont be passed on to any of you guys

i have several early 440 blocks and several sets of Eddy RPM heads like yours on assemble motors, I'll try and look at one of the early 440 blocks and see if mine(blocks) are like yours or not and if I think there is a issue with the Eddy RPM heads or not I'll post the results tomorrow I'm thinking no problems but I'll look and report back anyways

Is your Divot really 3/8,s wide?? If so, that would place the divots perimeters to about dead center between the two outer head bolt holes.

The water holes in the blocks I measured extend that far between the two bolt holes.

I have yet to see any Eddy heads divots extend that far. Even the heads you show in your link dont extend that far.

Can you show us pics of your heads divots. Do they cross the centerline of the two head bolt holes?? If not you should be good to go.

Like I stated earlier, my divots are only a 1/8" wide. that gives me a 1/4" sealing surface at that area. If your heads divot crosses that centerline and your block does too. You may have a problem. Can you go reacess both measurements when you get a chance?

I measured with a caliper a couple times and it seems that the holes will intersect,I will measure my head divets also and get back to you guys maybe with pics too. I'm thinking its just that the block is excessive that direction and the heads are more excessive than most eddys,they were some of the first ones made.

Mitch

Ok here goes, on the head the divet area ended up being a .687" dia. circle which goes in .470" from the outer machined edge, and it does go the center of the bolt holes.


The block has an oval slotted cooling passage .687"wide by .875" long which overlaps past the center of the bolts by.050" and is the main culprit where it wont compress the gasket in a critical sealing area.


I will fix it somehow but at the point I just want others to know about this for future referance and maybe double check this area,I don't think it would bother on the later dogbone shaped passages because I think the run they other direction.


I remember it being talked about a long time ago but didn't really get where the problem was,Thanx to everyone for coments,ideas and info


Mitch

Based on your specs your Id say your overlapped alright.

Have your heads been shaved yet? If not Id go ahead and shave them .050 like most of us have done from the get go with these heads. That will bring some decent compression for you and get you your sealing surface from the info you have posted earlier.