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1094 head gasket
#21
Hello.  I have a new Chev 350 crate engine that I was planning on installing Edelbrock aluminum cylinder heads.  As both the block and the heads will be new, would I be better off going with the 1094 gaskets or the 1142026 gaskets?  I usually use cost as a good judge of quality, and the 1142026 seem to be superior based on expense.  Also, would either gaskets present concern when using the aluminum heads on an iron block?  Thanks
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#22
(01-20-2017, 11:15 PM)Christian Wrote: Hello.  I have a new Chev 350 crate engine that I was planning on installing Edelbrock aluminum cylinder heads.  As both the block and the heads will be new, would I be better off going with the 1094 gaskets or the 1142026 gaskets?  I usually use cost as a good judge of quality, and the 1142026 seem to be superior based on expense.  Also, would either gaskets present concern when using the aluminum heads on an iron block?  Thanks

Hi Christian,

The 1142-026 gasket is a MLS (multi-layer steel) head gasket. MLS head gaskets offer superior sealing but require a smoother sealing surface than traditional composite head gaskets (60 Ra or smoother is required for Fel-pro MLS head gaskets). Even though the block and heads are new, the surface finish may not be suitable for MLS gaskets. We recommend checking with the supplies of the castings to see if you can fins out what the surfaces finishes are.

The 1094 gaskets are unique as far as non-MLS head gaskets go as they also would benefit from a smoother surface finish than that required by traditional composite head gaskets.

Both gaskets are fine for use on an iron block with aluminum heads.
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#23
Thank you for your reply. Is there a different head gasket that you would recommend for a high performance application that would provide a thin compressed thickness while also working excellent for the aluminum head to iron block? Or is there a traditional composite head gasket that would provide better performance over the others?
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#24
(01-26-2017, 06:11 AM)Guest Wrote: Thank you for your reply. Is there a different head gasket that you would recommend for a high performance application that would provide a thin compressed thickness while also working excellent for the aluminum head to iron block? Or is there a traditional composite head gasket that would provide better performance over the others?

Christian,

MLS head gaskets will provide the best performance as long as the surface finish appropriate for MLS gaskets. We design our gaskets to accommodate different combinations of head/block materials. Composite gaskets feature a special coating that allows the heads and block to expand at different rates without being damaged, however MLS gaskets still have the upper hand here as the full-hard stainless steel layers are even more durable.

Since your castings are new, we recommend checking with the manufacturers to see what the surface finishes are, as they may already be suitable for MLS gaskets, which would be ideal for a high-performance application.
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#25
i used the head gaskets from a engine gasket kit fs7733 pt-2 to install new promaxx heads on a stock 327. now i am getting a small oil leak at the back edge of both heads. will the 1094 help eliminate that leak? the heads are very smooth and the block wasnt decked. so my question is does fel pro make a gasket to address the smoothness of the head and the roughness of the block? a friend suggested the 501 sd.
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#26
(10-10-2017, 05:42 PM)bob Wrote: i used the head gaskets from a engine gasket kit fs7733 pt-2 to install new promaxx heads on a stock 327. now i am getting a small oil leak at the back edge of both heads. will the 1094 help eliminate that leak? the heads are very smooth and the block wasnt decked. so my question is does fel pro make a gasket to address the smoothness of the head and the roughness of the block? a friend suggested the 501 sd.

Hi Bob,

Even though the block wasn't decked the 7733 PT-2 gaskets shouldn't have any problem sealing it - is the sealing surface gouged or scratched? How was the block cleaned/prepped? Even with iron blocks, abrasive cleaning methods can damage the sealing surface or cause waviness that will result in leak no matter what gaskets you use.

We strongly recommend determining why oil is leaking and correcting it before reassembly.

The 1094 gasket is a single layer shim style head gasket with a silicone coating on it. This gasket is used in the Sportsman drag classes and for those looking to increase compression as the gasket is only 0.015” thick. We would not recommend that gasket for this application, as it requires a fairly smooth and flat surface to seal.

The 501 SD gasket is a good choice. It will accommodate both the differences in head & block surfaces. It also has Print-O-Seal beads around the perimeter of the gasket to help with oil and coolant sealing.

One tip when installing these head gaskets is to apply a small dab of RTV at the very top ends of the head gaskets – right where they meet the intake end seal areas, where that joint is formed, not all over the gaskets themselves. These areas are far away from the head bolts and sometimes the loading here is a little light. Apply a small dab on the head & block side of the head gasket at the end of the "ears" right before you are ready to install the heads.
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