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sbc heads installation problems

 
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travisbanshee6767
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PostPosted: Sun Mar 27, 2011 8:32 pm    Post subject: sbc heads installation problems Reply with quote

i have some holley heads from the systemax kit, altough i do not have the entire kit, i have a edelbrock rpm air gap intake.

problem
the engine runs just fine but the coolant is leaking into the oil somewhere. when i was putting the intake on there was a large gap between the intake and the block, looked like it fit the heads ok by eye anyways, i am thinking the gasket may not be tight on the heads where the coolant jacket is?
has anyone else had any problems with this?
has anyone had an intake machined to fit the heads properly?
thanks
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clay
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1972 Chevrolet Nova

PostPosted: Sun Mar 27, 2011 10:30 pm    Post subject: Reply with quote

Was any milling done to the heads - especially angle milling? Did you buy them new? How much gap was between the ends of the intake and the block? Usually around 3/16" or so when you just sit the intake on and it does go down to maybe 1/8" or so when you tighten it down. If I'm using the Felpro gaskets that have the silicone bead around the ports and the coolant passage I use the gaskets as it. Otherwise I'll put a thin layer of silicone around the coolant passages on both sides of the gasket. Did you use a bead of silicone for the end seals or did you use the rubber / cork strips that come with the gasket set? If you used the strips it's possible they could hold the intake away from the heads slightly and not let it seal. Welcome to Smokemup. Clay
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travisbanshee6767
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PostPosted: Sun Mar 27, 2011 11:00 pm    Post subject: Reply with quote

I did buy the heads used, I don't think they have been machined, I put a bead of silicon on the front and rear of the intake, tighten it down and niticed there was a huge gap, so I took it back off and bought new gaskets, and used spray adhesive for the rubber seals and silicone on top and let it setup for a few days, both times I installed the intake the bolts were very hard to get started almost as if the intake was not setting down far enough on the heads, I am getting a lot of coolant in the oil pan in a matter of 15 minutes run time, these gasket have to be the problem , because its not burning coolant, its just in the oil pan.
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Sun Mar 27, 2011 11:12 pm    Post subject: Reply with quote

I have not had good luck myself with the felpro intake gaskets when I had head to intake surface alignment issues. I did have good luck with an Mr. Gasket extra thick paper gaskets with indian head sealer around the ports and a bead of RTV black on the ends. I did not have coolant leaks with the felpros but I had a vacuum leak. The motor was pulling in oil from the bottom of the ports. The Mr. Gaskets fixed the issue. These are like 1/8" or 3/16" thick paper.
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2001 Focus 2.0 Zetec
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1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi


Last edited by Paul P on Thu Mar 31, 2011 1:08 pm; edited 1 time in total
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Mon Mar 28, 2011 2:43 am    Post subject: Reply with quote

travisbanshee6767 wrote:
I put a bead of silicon on the front and rear of the intake, tighten it down and niticed there was a huge gap, so I took it back off and bought new gaskets,


when you took the intake off, did you happen to take a close look at the used gaskets ? you should see a definite imprint all the way around all of the ports if it sealed correctly. make sure there isnt any part of the gasket around the ports (water and intake runner) that is not compressed.

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travisbanshee6767
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PostPosted: Mon Mar 28, 2011 2:59 am    Post subject: Reply with quote

I am going to be taking the intake off tomorrow and will look close at the gaskets, I hope its not because I have an edelbrock intake trying to fit the holley heads otherwise I wasted 600 bucks
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clay
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1972 Chevrolet Nova

PostPosted: Mon Mar 28, 2011 6:58 pm    Post subject: Reply with quote

If everything is right, there is no reason not to be able to mix and match parts. You should be able to run a Holley head on one bank and a stock head on the other bank and bolt up an Edelbrock intake and everyting still fit. Obviously not port alignment but you get the point. Are you running head studs? Another possible source of coolant leakage however it sounds like you do have an intake alignment problem. Clay
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travisbanshee6767
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PostPosted: Mon Mar 28, 2011 7:11 pm    Post subject: Reply with quote

I am running head studs, but and am looseing coolant to fast for that to be the problem, I change oil and filter run it for 15 min and there's probably 1 qts of coolant in the oil pan
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SMOKEmUP
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PostPosted: Tue Mar 29, 2011 10:20 am    Post subject: Reply with quote

If you got 1 qt of anti-freeze in the oil pan and the motor ran for 15 minutes the bearings are probably junk.
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Tue Mar 29, 2011 11:24 am    Post subject: Reply with quote

SMOKEmUP wrote:
If you got 1 qt of anti-freeze in the oil pan and the motor ran for 15 minutes the bearings are probably junk.


Not to mention the bore might be scored from the oil dilution. I had just water in my 406 on the dyno and it made a mess bearings and rings needed to be replaced and the bore needed a kiss from the honing machine.

_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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clay
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1972 Chevrolet Nova

PostPosted: Tue Mar 29, 2011 9:11 pm    Post subject: Reply with quote

If all you have done it idle it I wouldn't write the bearings off yet. Definately don't worry about them before you get the coolant problem fixed then you can start looking for signs of trouble there. Clay
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travisbanshee6767
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PostPosted: Tue Mar 29, 2011 9:45 pm    Post subject: Reply with quote

I just ordered new heads, got edelbrock e210. They are a lot better anyways, so I am going to pull the motor and put new bearings and new gaskets on, and through the head studs in the trash can
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Thu Mar 31, 2011 1:09 pm    Post subject: Reply with quote

Head studs were leaking?
_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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travisbanshee6767
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PostPosted: Thu Mar 31, 2011 1:18 pm    Post subject: Reply with quote

I don't know for sure I am taking the heads off tonight and having them crack checked, I will let you guys know what I find thanks for the help,travis
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