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Old 10-06-2007, 08:26 PM
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Copper gaskets whats the differance.

I have purchased a set of copper head gaskets the same ones used on a top alcohol motor.

due to the thickness need .080 to correct comp to run on 93 pump gas.

the block was decked .020 or .030 in a previous build and the pistons i used would make the comp to high see (update 528 stroker motor)

my question is will these gaskets be a problem they are sce pro copper gaskets and are listed for extreme street and bracket use??

am i asking for trouble
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Old 10-06-2007, 09:09 PM
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kinda. your quench will be off a bit, w/ the extra thick gasket. but the real problem is, copper gaskets don't seal off water, so you'll need to o ring the block. or have the tops of the pistions milled enough, that you can use a standard gasket, but even that's risky
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Old 10-06-2007, 09:20 PM
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Quote:
Originally Posted by matt167
kinda. your quench will be off a bit, w/ the extra thick gasket. but the real problem is, copper gaskets don't seal off water, so you'll need to o ring the block. or have the tops of the pistions milled enough, that you can use a standard gasket, but even that's risky
Or, you could dry deck the block. (Plug the water passages between the block and heads)
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Old 10-06-2007, 09:43 PM
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Quote:
Originally Posted by WDCreech
Or, you could dry deck the block. (Plug the water passages between the block and heads)
that would raise the comp, correct the quench yes, but accomplish nothing for comp ratio reduction.
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Old 10-06-2007, 10:28 PM
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The O'Ring's would only seal the compression area of the gasket. Street-able? Possibly! I use Coppercoat by Permatex around the water ports. It's marginal at least.
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Old 10-06-2007, 11:19 PM
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Thanks guys i just went on line with jeggs and ordered fel pro gaskets .051 i guess i might have to run a octane booster.

but on another note i have ran 11-1 on the street with iron heads before with careful tuning and tailored advance curve in my distributer on 93 octane

I new very little about copper heads thought they were just a bolt on
and didn't think of quench the exact purpose that i bought close chambered heads in the first place.

crappy gas what a drag so worried about compression didn't take the time to res-each a product before i bought it.

oh well lessen learn kind of expensive but not as bad as hydro locking a engine.

besides if it were easy what fun would it be its all about the challenge to have something a Little different to think out of the box and most of all have fun.

when i think off what i spent already i cant amagine break or blow something right off the bat . I mean i just dropped anouther $800 tonight on a king demon 1090 carb ,$50 adapter and or corse $115 heads gaskets.

again thanks for adverting a near catastrophe. Bill
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Old 10-07-2007, 01:13 AM
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I just can't stand to see a Grown Man Cry. Glad to have been some help. There's nothing worse than having something you have worked on so hard Blow Up in your Face.

Happy motoring:

From All OF Us

Been There, Done That

Steve
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Old 10-07-2007, 04:21 AM
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Copper gaskets don't seal on their own. O-ringing helps to seal the compression around the cylinders, but the water passages must be sealed.

There are several ways to do it. Some currently-published techbooks tell you to paint both sides of the gasket with silver spray paint. It actually works quite well, but its not ideal. Many folks use copper spray-on gasket adhesive.

At any rate, something must be put on them to seal water.
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Old 10-07-2007, 01:05 PM
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yea. could rig up a water/ alchahol injection system out of a washer fluid resivore and pump, w/ a smaller holley jet ( #61 or somthing ), spraying into the carb. use a NOS full throttle switch to turn it on. that will help detonation.
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Old 10-08-2007, 07:10 AM
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Another option would be to use Hylomar sealant around the water passages. I used a thin spray coat on my copper SCE gaskets with good results so far. It also comes in tube form.

Steve
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Old 10-08-2007, 07:34 AM
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What exactly are the specs of your engine? You never really said in your previous post.
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Old 10-08-2007, 08:44 AM
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With a

4.36" bore
4.375" stroke
84 cc chamber
.051" head gasket with 4.59" bore
deck clearance of -.0205 (above deck) assuming the deck height is 10.69 (.030" off 10.72")
4cc flat tops (1.423 c.h./ 7.1" rod)

I get a 12.05:1 static compression ratio. With the comp xe285hl cam you dynamic compression ratio will be too high. I would run a magnum 305h and that would give you a dcr of 8.15 right in the range (8-8.4) for pump gas. Your engine is much larger than the 440 that the cams rpm range is based on so it will seem like a smaller cam.
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