Speedmaster®

Chevy GM LS1 LS6 198cc 70cc Full CNC Aluminum Bare Cylinder Head

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MPN: PCE281.1090 UPC: 840136530350
Available Extended Warranty Eligible
US $718.00

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Available: 21

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Specs

Brand:Speedmaster
Part Number:PCE281.1090
Part Type:Cylinder Heads
Cylinder Head Style:Bare
Cylinder Head Material:Aluminum
Cylinder Head Finish:Natural
Combustion Chamber Volume (cc):70 cc
CNC-Machined Combustion Chamber:Yes
Intake Runner Volume (cc):198 cc
Exhaust Runner Volume (cc):n/a
CNC-Machined Intake Runner:Yes
CNC-Machined Exhaust Runner:Yes
Intake Port Shape:Cathedral
Intake Port Location:Standard
Exhaust Port Shape:Oval
Exhaust Port Location:Standard
Comp. Valve Job:No
Intake Valves Included:No
Intake Valve Diameter (in):2.020 in.
Exhaust Valves Included:NoÊ
Exhaust Valve Diameter (in):1.550 in.Ê
Valve Springs Included:NoÊ
Damper Spring Included:NoÊ
Retainers Included:NoÊ
Locks Included:NoÊ
Valve Stem Seals Included:NoÊ
Rocker Arm Studs Included:NoÊ
Rocker Arms Included:NoÊ
Rocker Arm Nuts Included:NoÊ
Guideplates Included:NoÊ
Valve Cover Mounting Style:Perimeter Bolt
Accessory Bolt Holes Drilled:YesÊ
Intake Valve Angle:15 deg.
Exhaust Valve Angle:15 deg.
Valve Guides Included:YesÊ
Valve Guide Material:BronzeÊ
Valve Seats Machined:Yes
Valve Seat Machine Style:3-angle
Valve Seat Material:Ductile ironÊ
Steam Holes Drilled:No
Oiling Style:Through pushrodÊ
Machined for O-Ring:NoÊ
Heat Crossover:No
Quantity:Sold individually.
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Description

Speedmaster LS-series cylinder heads is rapidly expanding. The LS (Gen3/4) platform has many design benefits over the earlier SBC engine designs, most notably the cylinder heads. Although the GM heads are good pieces, We have developed a superior line of heads for modern performance enthusiasts. Like all Speedmaster cylinder heads, the LS-series heads are produced using our 'Gravity Casting' process. This process ensures a more uniform and robust casting, laying a strong platform to build on. Take a look below at our offerings, surely you will find a head to suit your application. If you require any additional information, or help selecting the correct cylinder head for your application, please feel free to call one our techs.

INTAKE / EXHAUST GASKETS
Unlike most other Chevy V-8's, the LS-series engines utilize individual O-rings around each port to seal the intake manifold to cylinder head. The LS1 / LS2 / LS6 style heads & manifolds use GM pn# 12533587 and the LS3 / L76 / L92 style heads use GM pn# 1290125. On the Exhaust side of the head, all non-LS7 heads utilize the same MLS header gasket. The part number of the exhaust gasket is GM pn# 12901125.

Speedmaster is currently working on a line of MLS exhaust / header gaskets. Check with your salesman to see if we have a MLS exhaust gasket available for your application.

HEAD GASKETS
Because there are so many different bore sizes for engines in the LS-series, below you will find a list of Speedmaster and Fel-Pro head gasket part numbers and their bore size:

Bore SizeSpeedmaster MLS#Fel-Pro#
3.945" SM5221(pr.) 1160L/R (ea.)
4.050" SM5222(pr.)
4.100" SM5223(pr.) 1161L/R (ea.)
4.170" SM5224(pr.) 1162L/R (ea.)

These Speedmaster MLS head gaskets feature 100% stainless steel construction. We don't use inferior mild steel like some other aftermarket gasket suppliers. To aid in sealing, both outer layers of our MLS gaskets are covered with a high temperature coating. You won't find better value in head gaskets for a LS anywhere.

HEAD BOLTS / STUDS
Unlike the early GM heads, Speedmaster heads use common length head bolts / studs. Starting in 2004, GM heads went to the same common length head bolt arrangement. By using bolt / stud registers that are all the same thickness, equal clamp load is created all the way around each cylinder. Our part number for the correct head stud kit is SM2464.

The ARP part numbers that work with our LS-series heads are # 134-3610 (bolts) and #23-4317 (12pt. stud kits)

DO NOT RE-USE GM HEAD BOLTS, THEY ARE TORQUE-TO-YIELD (TTY) AND CAN ONLY BE USED ONCE!

Torque the 11mm. bolts / studs to 65lbs and the 8mm bolts / studs to 20lbs. using high pressure moly lubricant.
*Please consult your hardware supplier for their specific torque recommendations!

SPARKPLUGS
Be careful with your selection of sparkplugs in the LS-series engines. The OEM plug is a NGK TR5. We recommend that you use NGK TR6 sparkplugs on performance oriented engines. If you require a sparkplug colder that a 6 heat range, you will have to switch away from resistor style plugs, and into the NGK R5724-7 or R5724-8. These colder plugs dont have an internal resistor, so they my cause some slight RF interface. Usually it's not a problem unless you have a really sensitive aftermarket ECU, and even then it's not normally a problem.

If your prefer Autolite sparkplugs, use the AR103 for street / strip performance engines. The AR94 is quite a bit colder for those of you looking to squeeze N20, or heavy boosted engines.

Brand Information



Speedmaster has become a leader in its field, built on a long term consistency of being a specialist in aftermarket automotive components. The team has shared all the finest moments in the numerous accolades for its people, its products, and its approach. Speedmaster is also one of the rare companies to produce its own products, where majority items are entirely developed and manufactured in its workshops. The ultimate token of precision, Speedmaster is the world’s only major parts manufacturer to equip cars from Standard replacement to Top Fuel Dragsters. 

In 1979, the company was founded with Pete’s Performance, which was a small speed workshop. It began by building engines for customers as a hobby, and it has now grown to include selling, assembling, manufacturing and racing high performance engine parts. Over the years, the company has grown into a worldwide high performance powerhouse. Growing from a one-man bricks-and-mortar business; to now a supply chain in which en

Prop 65 Warning

This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.


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