m menu image  m home

Customers

Scot C.

Scot C.

Thanks for everything John. We will be doing business again. At Nationals 6.38 on a 6.54 dial in.
Read More ->


David P.

David P.

Thanks for the brake lines !
Read More ->


Ricky R.

Ricky R.

1937 Chevy Legends Race Car, Thanks for everything!
Read More ->


Daniel C.

Daniel C.

Thanks for your exemplary service. Keep doing what you're doing. Daniel C.
Read More ->


Bob F.

Bob F.

Plymouth 426 Hemi
Read More ->


Phil S.

Phil S.

Great job creating this Dakota R/T Ground Affects Kit. Phil
Read More ->


Michael D.

I just wish there were more guys like you around for us gen3 guys. Most just want a sale and don't care to actually help let alone give advice or...
Read More ->


Jason B.

Thanks John.. you have been awesome to work with and I am REALLY looking forward to driving my SRT-10 again :) Jason
Read More ->


Clay B.

Clay B.

Thanks for everything !
Read More ->


Steven

Southeast Performance and John Mercedes have been "OUTSTANDING" to do business with. I couldn't be happier.
Read More ->


Chris B.

Chris B. won the late model feature easily Texas Motor Speedway.
Read More ->


Ryan

bought numerous things and all transactions went very smooth. Responded to emails within a day or less. Ryan
Read More ->


Ossi L.

you come highly recommended to me by Finnish racers!
Read More ->


Michael W.

Michael W.

After getting all the compatible stuff shes a beast! Michael
Read More ->


Bill S.

Bill S.

Thanks John, 426 Hemi stroker 588 https://www.youtube.com/watch?v=1dJdt0ZFzjU
Read More ->


Bruce P.

Bruce P.

John, you have been so prompt and helpful. Take care my friend and thanks again. I'll be back. Bruce
Read More ->


Tom R.

John--the 408 engine you built for me is outstanding. Feel free to give him my cell number and I'll happily give you a strong reference. Thank you...
Read More ->


Andrew R.

Andrew R.

I am very pleased with the quality of the magnum deep pan, and the best part is that it really is not much deeper than the stock pan so I dont have...
Read More ->


Billy W.

Billy W.

Dakota R/T 408
Read More ->


Daryl S.

Your 408 runs like a dream. I think we are well over the 400hp side, a new 300hp mustang could not overcome, it is a beast. I am very happy with the...
Read More ->


Bruce P.

Bruce P.

You’ve got a big fan in me. Oh yeah, the car is awesome. Runs like a raped ape. So thanks a lot !
Read More ->


William K.

You do outstanding work man. My whole crew is ready to see your work in action ;-)
Read More ->


Jared B.

John, You Rock! Thanks again for the great deals and speedy service. Really appreciate it. Jared Dakota R/T
Read More ->


Taylor M.

Taylor M.

Thanks a lot John !
Read More ->


Alexander F.

Alexander F.

Hey John! Roller Rockers are still in and have been great. I get almost 18mpg highway! I seriously appreciate all your help.
Read More ->


Cometic Head Gasket Tech

Can MLS head gaskets be used with motors setup with o-rings or receiver grooves around the cylinder bores?
No. MLS head gaskets require smooth, flat and true head and deck surfaces to seal. Most of the time with o-ring setups the wire and groove fall where our gasket’s combustion seal is located; therefore, the wire will hold the gasket and not allow proper compression while the receiver grooves allow combustion gases to escape.

What surface finish is required to us an MLS head gasket?
A surface finish of 50 RA (roughness average) or finer, is recommended for a proper gasket seal. Anything rougher may conflict with the gasket design.

What head bolt/stud torque do you recommend when using an MLS gasket?
When using MLS head gaskets always refer to the manufacturer of the fastener to determine accurate torque values. Appropriate torque is critical when installing new gaskets of any kind.

Why does Cometic recommend MLS gaskets to be installed dry?
Cometic Multi-Layer Steel (MLS) head gaskets go on dry because they are coated with a sealant. Each MLS head gasket is coated with a .001" thick Viton rubber that is bonded to the outer stainless steel layers. Adding an additional sealer can hinder the performance of an MLS head gasket.

Can I order head gaskets with a different thickness and/or bore size than you have in your catalog?
Yes. Call Cometic with the engine type or Cometic standard part number (search online or in our catalog) along with the bore size and thickness you would prefer and we will create your custom gasket.




Parse Time: 0.210 - Number of Queries: 206 - Query Time: 0.042986778793334