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Head Gaskets Block Coolant Passages #1418034 04/11/13 01:54 AM 04/11/13 01:54 AM
Joined: Jun 2006 Posts: 5,161 CT GTX MATT OP master
GTX MATT OP master Joined: Jun 2006 Posts: 5,161 CT	I bought a set of Mr Gasket steel shim gaskets for my 440 with Stealth heads. When checking the fit around the combustion chambers I noticed a severe blockage of some of the coolant passages. I'm thinking Whiskey Tango Foxtrot, stupid aftermarket junk. So I dragged a 906 out from under the bench, same deal. Stupid Mr Gasket [Edited by Moparts - Family Friendly Site - Keep it clean] So I got out one of the fel pro 8519PTI gaskets (standard gasket) and guess what? Same deal, worse actually. I wish I kept my original head gaskets to compare, the witness marks on the 906 heads from the original 1967 date coded gaskets look like it wasn't interfering before but of course the marks are from the embossings. I ran a set of that same gaskets I believe when fixing a burned valve on a buddy's 383 over the summer. I had bought them 3 years ago, but it was the same kit. I'm ashamed to say I never checked the fitment to the head, or if I did I don't recall seeing this, but it was the same kit and I assume the same gaskets. Is this okay? Should I mod the gasket? Anyone else know anything or noticed this before? I can't be the only one. I don't see how it could be okay its blocking a head to block passage, but my buddy's 383 didn't have any cooling issues. On a side note my first combustion chamber CC'd 79 cc Last edited by GTX MATT; 04/11/13 02:03 AM.

Re: Head Gaskets Block Coolant Passages [Re: GTX MATT] #1418035 04/11/13 01:55 AM 04/11/13 01:55 AM
Joined: Jun 2006 Posts: 5,161 CT GTX MATT OP master
GTX MATT OP master Joined: Jun 2006 Posts: 5,161 CT	Pic 1 7663457-gasket1.jpg (170 downloads) Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street

Re: Head Gaskets Block Coolant Passages [Re: GTX MATT] #1418036 04/11/13 01:55 AM 04/11/13 01:55 AM
Joined: Jun 2006 Posts: 5,161 CT GTX MATT OP master
GTX MATT OP master Joined: Jun 2006 Posts: 5,161 CT	pic 2 7663458-gasket2.jpg (127 downloads) Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street

Re: Head Gaskets Block Coolant Passages [Re: GTX MATT] #1418037 04/11/13 01:56 AM 04/11/13 01:56 AM
Joined: Jun 2006 Posts: 5,161 CT GTX MATT OP master
GTX MATT OP master Joined: Jun 2006 Posts: 5,161 CT	pic 3 7663459-gasket3.jpg (151 downloads) Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street

Re: Head Gaskets Block Coolant Passages [Re: GTX MATT] #1418038 04/11/13 02:59 AM 04/11/13 02:59 AM
Joined: Aug 2003 Posts: 12,291 Kent, Wa 340SHORTY Truck Nut
340SHORTY Truck Nut Joined: Aug 2003 Posts: 12,291 Kent, Wa	The restrictions in the gaskets are there to slow the coolant down so the there is better heat transfer to the coolant. I am truckless..

Re: Head Gaskets Block Coolant Passages [Re: 340SHORTY] #1418039 04/11/13 03:16 AM 04/11/13 03:16 AM
Joined: Aug 2003 Posts: 43,157 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,157 Bend,OR USA	Quote: The restrictions in the gaskets are there to slow the coolant down so the there is better heat transfer to the coolant. OP, your good, put them babys on Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Head Gaskets Block Coolant Passages [Re: GTX MATT] #1418040 04/11/13 06:35 AM 04/11/13 06:35 AM
Joined: Jan 2003 Posts: 21,071 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,071 Niles , Ohio	I agree install them.Why try to out figure the factory engineers.Rocky Chrysler Firepower

Re: Head Gaskets Block Coolant Passages [Re: therocks] #1418041 04/11/13 07:29 AM 04/11/13 07:29 AM
Joined: Jan 2003 Posts: 1,790 Greer, SC TooMany62s top fuel
TooMany62s top fuel Joined: Jan 2003 Posts: 1,790 Greer, SC	Those big holes are sized that way to get the sand out of the casting in the foundry. This is true of both the block and the heads as they are "sand castings". The gasket reduces them to what they should be for cooling. I never tried opening them all up to the casting size to see what would happen.

Re: Head Gaskets Block Coolant Passages [Re: GTX MATT] #1418042 04/11/13 10:31 AM 04/11/13 10:31 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	go to www.moparchat.com then scroll down to & click on "circle track chat" then peruse Sanborns' cooling mods that are in a sticky at the top & that info may better help you make an informed decision. He's a SB guy but the info is still applicable to BB's with some differences. live every 24 hour block of time like it's your last day on earth

Re: Head Gaskets Block Coolant Passages [Re: GTX MATT] #1418043 04/11/13 10:37 AM 04/11/13 10:37 AM
Joined: Oct 2006 Posts: 596 Mass. 8 80fbody mopar
80fbody mopar 8 Joined: Oct 2006 Posts: 596 Mass.	Are you sure you're supposed to use steel shim type gaskets with aluminum heads?

Re: Head Gaskets Block Coolant Passages [Re: 80fbody] #1418044 04/11/13 10:44 AM 04/11/13 10:44 AM
Joined: Jun 2006 Posts: 5,161 CT GTX MATT OP master
GTX MATT OP master Joined: Jun 2006 Posts: 5,161 CT	Quote: Are you sure you're supposed to use steel shim type gaskets with aluminum heads? You're not supposed to but many guys are running them and getting away with it. I think with the superior head clamping design of the Chrysler big blocks and Chevrolet small blocks and big blocks that most people would be fine (17+ head bolts rather than 10). I'll probably copper spray them, although the instructions say that you shouldn't because they already have a coating on them. It looks like they're aluminum painted. And thanks guys, I guess I've never actually really looked at this before. I figured its supposed to be since both gaskets were this way, but it didn't make sense. Since my detective at Moparts have explained the reasoning I feel comfortable with them now. Thanks Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street

Re: Head Gaskets Block Coolant Passages [Re: GTX MATT] #1418045 04/11/13 10:47 AM 04/11/13 10:47 AM
Joined: Oct 2006 Posts: 596 Mass. 8 80fbody mopar
80fbody mopar 8 Joined: Oct 2006 Posts: 596 Mass.	I'd be more concerned with the the steel gasket ruining the head surface but I've never run aluminum heads.

Re: Head Gaskets Block Coolant Passages [Re: 80fbody] #1418046 04/11/13 10:50 AM 04/11/13 10:50 AM
Joined: Jun 2006 Posts: 5,161 CT GTX MATT OP master
GTX MATT OP master Joined: Jun 2006 Posts: 5,161 CT	Quote: I'd be more concerned with the the steel gasket ruining the head surface but I've never run aluminum heads. I've heard this noted before, but theres quite a few threads on here about steel gaskets with aluminum heads. They say multi-layer steel is okay, so what difference would that make on the surface of the head that the regular steel shim wouldn't? Not being a wise guy, just wondering if you'll learn me something new Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street

Re: Head Gaskets Block Coolant Passages [Re: GTX MATT] #1418047 04/11/13 11:25 AM 04/11/13 11:25 AM
Joined: Oct 2006 Posts: 596 Mass. 8 80fbody mopar
80fbody mopar 8 Joined: Oct 2006 Posts: 596 Mass.	Dis-similar metals, aka steel & aluminum, don't generally mix well. Not sure the technical term but over time the steel sort of eats into the aluminum head surface. Also the steel gasket is a harder material than the aluminum head which means the gasket could imprint itself into the head. Doesn't seem worth the risk with high dollar heads.

Re: Head Gaskets Block Coolant Passages [Re: TooMany62s] #1418048 04/11/13 11:38 AM 04/11/13 11:38 AM
Joined: Jan 2003 Posts: 75,004 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,004 U.S.S.A.	Quote: Those big holes are sized that way to get the sand out of the casting in the foundry. This is true of both the block and the heads as they are "sand castings". The gasket reduces them to what they should be for cooling. I never tried opening them all up to the casting size to see what would happen. I agree with this but the fly in the ointment is that around 1973 they changed the holes in the block to a figure 8 shape which ends up having a round hole right in line with the round hole in the head, BUT they changed the gasket from the rectangle to a slit.

Re: Head Gaskets Block Coolant Passages [Re: 80fbody] #1418049 04/11/13 11:40 AM 04/11/13 11:40 AM
Joined: Jan 2003 Posts: 75,004 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,004 U.S.S.A.	Quote: Dis-similar metals, aka steel & aluminum, don't generally mix well. Not sure the technical term but over time the steel sort of eats into the aluminum head surface. Also the steel gasket is a harder material than the aluminum head which means the gasket could imprint itself into the head. Doesn't seem worth the risk with high dollar heads. BUT BUT BUT .... People run MLS Cometic gaskets with alum heads ?????? The fire ring , if that is what it is called , on a felpro gasket is STEEL ???? Coat the gasket with copper spray and he should be fine ...

Re: Head Gaskets Block Coolant Passages [Re: 80fbody] #1418050 04/11/13 07:51 PM 04/11/13 07:51 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Quote: Dis-similar metals, aka steel & aluminum, don't generally mix well. Not sure the technical term but over time the steel sort of eats into the aluminum head surface. Also the steel gasket is a harder material than the aluminum head which means the gasket could imprint itself into the head. Doesn't seem worth the risk with high dollar heads. It's called bi-metallic corrosion. I wouldn't sweat it if you use coolant and not straight water as the coolant has corrosion inhibitors. Also, it really doesn't matter what head gasket you use, in regards to corrosion, they all will have a dissimilar metals issue. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: Head Gaskets Block Coolant Passages [Re: 80fbody] #1418051 04/12/13 01:13 AM 04/12/13 01:13 AM
Joined: Jan 2003 Posts: 75,004 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,004 U.S.S.A.	Quote: Dis-similar metals, aka steel & aluminum, don't generally mix well. Not sure the technical term but over time the steel sort of eats into the aluminum head surface. Also the steel gasket is a harder material than the aluminum head which means the gasket could imprint itself into the head. Doesn't seem worth the risk with high dollar heads. Can't ... resist ... He doesn't have High Dollar Heads ... ...

Re: Head Gaskets Block Coolant Passages [Re: JohnRR] #1418052 04/12/13 03:31 AM 04/12/13 03:31 AM
Joined: Mar 2003 Posts: 4,848 Memphis HemiRick master
HemiRick master Joined: Mar 2003 Posts: 4,848 Memphis	Ive been running a set of steel shims under alum heads for 6+ yrs now with no problems at all. Last edited by HemiRick; 04/12/13 03:31 AM. Take care, Rick 68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451

Re: Head Gaskets Block Coolant Passages [Re: JohnRR] #1418053 04/12/13 11:22 AM 04/12/13 11:22 AM
Joined: Jun 2006 Posts: 5,161 CT GTX MATT OP master
GTX MATT OP master Joined: Jun 2006 Posts: 5,161 CT	Quote: Quote: Dis-similar metals, aka steel & aluminum, don't generally mix well. Not sure the technical term but over time the steel sort of eats into the aluminum head surface. Also the steel gasket is a harder material than the aluminum head which means the gasket could imprint itself into the head. Doesn't seem worth the risk with high dollar heads. Can't ... resist ... He doesn't have High Dollar Heads ... ... HEY I was actually going to say that myself, but I guess 1000 bucks is more than a stock set of 906 costs in most cases Last edited by GTX MATT; 04/12/13 11:24 AM. Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street

Re: Head Gaskets Block Coolant Passages [Re: GTX MATT] #1418054 04/12/13 12:09 PM 04/12/13 12:09 PM
Joined: May 2008 Posts: 5,399 Aurora, Colorado 451Mopar master
451Mopar master Joined: May 2008 Posts: 5,399 Aurora, Colorado	The MLS gaskets are coated. The chemical reaction between dissimilar metals is called "Galvanic corrosion". The small holes/slots restricting coolant flow are by design. The coolant is supposed to flow from the front of the block to the rear of the block, up through the big hole at the rear of the cylinder head then to the front of the cylinder head. The restrictions in the gasket help force the coolant to the rear of the block, but also allow some cooler coolant up to the head to equalize the themperatures through the cylinder head.

Re: Head Gaskets Block Coolant Passages [Re: 451Mopar] #1418055 04/12/13 01:17 PM 04/12/13 01:17 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Thank you for a sane response. R.

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