JE Piston - small block chevy

Small Block Chevy

JE Pistons for small block chevy – remember we are the UK’s Number ONE distributor of JE Pistons from 2007 t0 2014!

JE Pistons






23º 350 & 400 F.S.R. HOLLOW DOME GP (GAS PORTED) New FSR version of our popular 23º domed pistons are ideal for circle track and drag racing. Up to 70 grams lighter than traditional full round (including wrist pin and rings), but stronger and more durable due to modern FEA-designed forging. Deeper valve pockets to accommodate higher lift cams and milled cylinder heads. Accepts low friction .043/.043/3.0mm ring package. 

Accumulator Groove
Contact Reduction Grooves
Double Pin Oilers
Lateral gas ports
Pin #927-2250-15-51C (106g)
Wire Locks #927-073-MW 


Click for a full part list - plus JE specification and technical installation information, plus valve relief diagrams

Cometic Gaskets

Cometic – Tech Support

Cometic Technical Support

Technical support is available via the Cometic website. They also have an awesome collection of racing videos on site – click blog

We do supply other makes of gaskets so please contact us if you need any help.

Cometic HQ

Here is a selection of frequently asked questions:

What is MLS?

MLS stands for Multi-Layer Steel. MLS head gaskets are comprised of three or five layers of stainless spring steel. The outer layers are an embossed Viton coated stainless steel providing a superior seal with excellent rebound characteristics and are corrosive resistant. MLS head gaskets reduce bore distortion and withstand extreme cylinder pressures. The MLS design is also used in a superior line of exhaust manifold/header gaskets.

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. (800-752-9850 or 440-354-0777)

What is EST?

EST = Extreme Sealing Technology. EST Harley-Davidson® gasket kits contain: MLS head gaskets, steel viton coated base gaskets, Viton valve stem seals, AFM material (instead of paper), race style exhaust gaskets and one piece rocker box base gaskets. The race style exhaust gaskets will not fray into the port; while the one piece rocker box base gaskets are made from a single layer .020” embossed Viton coated steel. Because of the hi-tech components EST kits are more expensive than standard kits but provide the best seal in the business.

For more visit the Cometic site or see our own Cometic Gaskets page.


JE Pistons

JE Pistons – Ford Modular Engine Series

JE Pistons is pleased to introduce its new high-performance line of pistons developed for the Ford Modular engine series. Performance Unlimited have been JE Pistons number one supplier since 2007.

This technology specifically aims to meet the needs of Ford performance enthusiasts with applications for the 4.6 liter (2, 3 & 4 valve), 5.0 liter Coyote engines and 5.4 liter (2, 3 & 4 valve).

Watch Nick Diblasi, Product Manager introduce the new product.

Please call out team for further information.


ATI Performance : Clutch Hub Assembly

ATI Super Pulley Clutch Hub Assembly for High Horsepower Supercharged Engines

Here is the latest from the ATI site.

ATI Performance Products is proud to introduce its new Super Pulley for large displacement superchargers and high horsepower race engines! The new Super Pulley (Part # 916216) accommodates the customer’s bolt on pulley as small as 50 teeth by 8mm HTD. ATI’s Superior Sprag Technology releases the blower whenever it is spinning faster than engine RPM – virtually eliminating belt failures. “

See the YouTube video below to see the assembly in action!

To place an order call us or email details.

total seal piston rings

Total Seal M2 Piston Ring

Total Seal Piston Rings is proud to welcome a new product to it’s portfolio.

M2 Tool Steel top rings: They offer the ultimate in durability over any other material commonly used in piston ring manufacturing.

Click to see the M2 pdf on the Total Seal website.

Total Seal distributed by Performance Unlimited

Performance Unlimited distribute Total Seal piston rings, so call us on 01904 489332 to place your order

Copyright © Performance Unlimited 2015