Interested in this AMW 4x4 build?

Talk to us about build slots, timing and fitment - or call (02) 5854 9001.

ENQUIRE ABOUT THIS BUILD

Higgins CNC ported cylinder heads for the GM LS3, L98 and L77, supplied on an exchange basis.

These are rectangle port heads, CNC ported by Higgins Race Heads, and supplied with standard factory valves installed. Valve springs are not included.

Brand: Higgins Race Heads
Engines: LS3, L98, L77
Castings: 0821, 5364, 0823
Supplied: with factory valves installed, no valve springs
Basis: exchange

Options (choose above):
- Stainless steel valve upgrade
- VTKLS8 valve spring kit (.650in): +$725.98
- Spring kit fitted by us: +$923.98 (kit plus 1 hr cylinder head assembly labour, $198)

Please call us on (02) 5854 9001 to arrange the exchange and confirm what you need to send in. We are based in Dubbo NSW.

Higgins L98/LS3 CNC Heads (Exchange)

Name: Higgins L98/LS3 CNC Heads (Exchange)
Brand: Higgins Race Heads
SKU: LS-CNC-HRD-0821-823-5364
Price: 1690 AUD
Availability: InStock

SKU: LS-CNC-HRD-0821-823-5364

$1,690.00

Valve Option

Valve springs

Cylinder head terms

0/60

Quantity

Higgins Race Heads

- Cylinder heads come with standard factory valves installed. Valve springs are NOT included.

- A valve spring kit (VTKLS8, .650in) is available as an option for $725.98.

- If you want us to fit the springs, cylinder head assembly is charged at 1 hour labour ($198).

- Upgrading to stainless steel valves is optional. We recommend stainless valves if you are going down the forced induction path and running over 15 psi of boost.
Valve seat retention

Higgins exchange cylinder heads are CNC ported and remanufactured from used OEM GM LS castings. These castings use pressed-in factory valve seat inserts, held in place by an interference fit.

Over the life of an engine, heat cycling, thermal expansion and normal wear can reduce the interference fit of a seat insert. In rare cases a seat may move or come out of the head while the engine is running (known as a "dropped valve seat"). It is uncommon and can't be predicted. When it happens, it is a known characteristic of the original GM casting and seat design. It is not caused by the CNC porting or by our cylinder head assembly.

We inspect the valve seats on every head during assembly. A seat that has lost its interference fit can't be detected on the bench, however. It usually shows no visible sign until it moves under engine heat and load. For this reason we can't guarantee that a factory seat won't move in service.

Things that increase the risk: overheating or cooling system faults; high exhaust gas temperatures or lean running; high boost, nitrous or aggressive tuning; incorrect valve spring, valvetrain or installation setup. These conditions are outside our control.

To the extent permitted by law, McKay Performance Centre is not liable for valve seat movement or failure, or any engine damage that results from it, where it is caused by general wear and tear or operating conditions rather than a defect in our workmanship.

Nothing in these terms excludes, restricts or changes any right or remedy you have under the Australian Consumer Law. If you have any questions before ordering, call us on (02) 5854 9001.
- Customer must supply exchange cylinder heads, any repairs required there will be additonal charges.

Engines, conversion kits and special-order items are ordered in or built for you, so they can't be returned for change of mind once ordered. If anything arrives faulty or not as described, contact us on (02) 5854 9001 or info@mckayperformancecentre.com.au and we'll sort out a repair, replacement or refund under Australian Consumer Law.