Engine HEAD GASKET HELP !!

LouDegro3628

New Member
Aug 8, 2019
6
0
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Wantagh, NY 11793
hey so I found some coolant in my oil. (hope for the best prepare for the worst)...
upon tear down, everything was in order except for the head gaskets. the block is O RINGED 306 sbf, trick flow twisted wedge heads, wolverine cam, vortech v1 (5-8) psi.
i found that the head gaskets he used were not made for O RINGED blocks, hence the coolant in the oil and in between the deck and heads. upon further investigation...
I called ALL the gasket companies and they all said the same thing. take out the oring and run a MLS from either COMETIC or FELPRO. spray them down with copper spray before and youll be good to go. i found some old posts from about 10 years ago on this topic and they all seem to agree with this plan of action.
is this still the way to go??? I dnt want to tear down the block again if I don't have to. ( atleast not for the same issue). this will not be a track car, and in fact will probably see very light street use in the spring and fall. (no AC no heat) so if i go the recomended way, my question is

1. what bore size gasket should i get? (shes a 306)
2. what thickness should i get?
3. fel pro or cometic (even though both say not to use with oring reciever grooves around the bore)

ANY info on this topic would be greatly appreciated as i would like to start building her back up asap. thanks guys.
 
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John Dirks Jr

there is enough sticking out to grab on to
Jun 28, 2013
2,790
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Maryland
I dont know about running MLS on an o-ringed block so I can’t confirm what others have told you on that.

I do have suggestion on thickness of MLS to order. I use Cometic with good results so obviously, that's what I recommend.

I also recommend to pull the block and deck it, even if only .001 Deck the heads too. Add the total of material removed from the block and heads. For instance. .005 from each side of the block, .010 from the heads. Total there is .015. Measure the thickness of the gaskets you just removed. Let's say .040 for example. .040 + .015 = .055. Order Cometic in .055 thickness. That makes you CC volume the same as it was before.

With a boosted application, you don't want to cut any corners in the head gasket area. Otherwise, you'll be doing head gaskets again before you know it.
 
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LouDegro3628

New Member
Aug 8, 2019
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37
Wantagh, NY 11793
hey that sounds good. engine is out and on the stand. shes a 92 im swapping into my 86 notch. im trying to avoid the machine shop since the motor was rebuilt about 5 years ago and was barely run since the rebuild. maybe 20 miles. (luckily, or else there could have been serious damage with improper head gaskets). upon tear down everything is clean, like machine shop clean. pistons barely have any black on them same with the cc on the heads. the coolant on the deck and in the oil was the dead giveaway for the heads gasket being the wrong application. I know for a fact it came from a machine shop that did the rebuild, kinda messing with me that they used these gaskets. a mistake?? maybe... a last minute, "lets get this thing outta here"?? maybe.. so I really just want to clean this thing up and replace what I need to replace and continue on with this build. def not trying to cut corners just trying to avoid machine shop at all cost. $$$$$$ I know the spec for the fel pro 1011-1 is 4.1 bore .041 thickness. iv never really looked into sizes of heads gaskets before just used what was recommended for a 302.
is 4.100 bore gasket to large for a 4.030 306 or is that just a normal size to use?
should I be using a 4.030 bore gasket instead?
same with the thickness, is .041 a standard thickness for 4.100 bore?


also I didn't mention it, but all those threads from 10 years ago all pretty much all said the same thing. remove the o ring and use a COMETIC MLS. they all used that method and had no problems to report.

I really appreciate and all info, thanks so much.
 

John Dirks Jr

there is enough sticking out to grab on to
Jun 28, 2013
2,790
1,193
174
56
Maryland
Clean the block deck and head surfaces til spotless. Check for warp with a machine grade straight edge and feeler gauge. Anything even close to being out of spec needs machining.
 

vristang

15 Year Member
Mar 31, 2005
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Seattle
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4.100" is pretty standard. Unless you are preparing for Engine Masters Challenge, that gasket will work just fine...

If it were me, I would clean it and put it together with the correct o-ring gasket. Not my area of expertise though.
 

LouDegro3628

New Member
Aug 8, 2019
6
0
1
37
Wantagh, NY 11793
THANK SO MUCH GUYS!. all this info is great. so I cleaned the block and heads up and checked for warpage and we are all good. im gonna pull the o-rings out and just run the MLS gasket. does any one have a recommendation for the thickness of the gasket.?? I know .040 or .041 is pretty much standard, but do I need it to be a little thicker so as to fill the receiver grooves around the bores??
 

HotFox

10 Year Member
Jan 5, 2009
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SE Michigan
What is the protrusion on the o ring? I'm running a 331 with a solid stainless ring, if I remember correctly about .010". My setup is with a stock Felpro gaskets, it's been together 9 years. The protrusion just gives a extra bite into the fire ring. I bought the car done I presume the previous owner planned to spray it is why it was done.


Scott