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Cylinder Heads

RS+ Type 4 Cylinder Heads


More info on LN Engineering's Prop 65 policy

RS+ Type 4 Cylinder Heads

$4,092.75

Contact us for availability and ordering info

SKU: 7607

The RS+ heads are plug & play replacements for the sought after Porsche designed 039 101 371A 2.0 914 heads, sometimes referred to as 3 stud heads. They come with 3 intake manifold studs and machined M10 F.I. temp sensor threads in the factory location, making them suitable for use with factory F.I. or carbs. They can also be used on 1976 Porsche 912E engines, though if the factory EGR system is to be retained then the heads will need the M10 threads machined into the exhaust ports. This is also true of later model California 914’s subject to emissions testing. Please note that if carbs will be used, the intake manifolds will need to have the 3 stud pattern. Most popular aftermarket manifolds come with a universal pattern that will work with 3 & 4 stud heads.

While many products for engines are developed, brought to market and never further developed, that is not the case with the RS+. In 2019 we added thermal barrier coated chambers and exhaust ports based which based on our research help to improve valve sealing and extend valve job life by reducing how much heat goes into the heads from combustion and exhaust heat. The ceramic coatings applied to the exhaust ports can handle sustained 1400F+ temperatures and are proven on track. Heads also feature a thermal dispersant coated exterior. All coatings are done by the industry leader, Calico Coatings, and really work!

New for 2020, the RS+ has changed radically from previous offerings. To say that they have changed radically from inception to present would be a misrepresentation. The quality of the head castings we had been sourcing from AMC had dropped off severely, so our cylinder head expert has worked with AA and we are happy to report, these new RS+ heads based off the AA castings are far superior to any previous version. These are not off the shelf heads - we take new AA castings, throw everything away, and completely re-do them and replace everything down to seats and guides. We are also incorporating cryogenically treated and REM superfinished valve springs for added spring life.

RS+ heads now flow almost as much as our old LE200s. Valve sizes have also been bumped up to 44 x 38 for 2020 and feature improved port velocity, even with larger valves, and are port-matched to the factory fuel injection insulator gaskets. Chambers are also coming in within half a cc, not plus or minus a half cc (in most cases).

These heads are easily the most versatile in the line-up. They were developed for serious 2.0 engines with autocross and spirited driving in mind. The intent was to develop a port shape that would have extremely high port velocities in the mid lift range. Peak flow was targeted for around .420 lift. The earliest efforts showed great promise as flow data indicated we were close to the target. Subsequent tweaks combined with seat profile testing have produced a head whose adaptability to a variety of engine combos has surprised both Jake and I. These heads have proven themselves at home on 1911’s and even 2270’s. On the smaller engines with mild cams, they have excellent response and cruising characteristics. On 2270’s with more aggressive cams, that excellent low end response is still there along with incredible mid range and cruising characteristics.

It’s worth noting that the intake flow gains from port matching are very slight and only show up on the upper end of the lift range. For that reason we only recommend it for large displacement engines and competition engines where every last drop of performance is needed.

The addition of premium dual Crower springs and retainers allow for long life even at elevated revs. Spring coil bind clearances are set to accommodate up to .530” lift.* Lower lifts typically require less open spring pressure so these springs will give that with no shim adjustments. This adds to the versatility of these heads. We're not aware of any .500” lift solid flat tappet cam that these springs won’t effortlessly handle to 7,500rpm.

*The step may be machined out upon request. This is an optional service, though there is no additional charge. If you would like the step removed please mention this when the order is placed. Orders placed with no reference to the step will be shipped with the step in place.

**If more lift is needed we can accommodate that, but you’ll need to indicate your valve lift when the order is placed. If no mention of valve lift is made, coil bind clearance will be set to accommodate .510” lift.

Our cylinder heads are not available anywhere else and all Aircooled Technology engines feature the same cylinder heads sold by the Type 4 Store. Your Type 4 deserves the best!

NOTE: Due to limited availability and high demand, we will not be offering our Camper Special, RS+, or LE200 heads for purchase outside of our engine kits.

Description

Details

Model

RS+

Serial # Stamped in heads.

L2003

Chamber volumes

59.9cc’s

Step Cut

No

Coatings

Ceramic Chambers & Ex Ports.

Exterior Black.

Valve Sizes

44mm x 38mm

Retainers

Chromoly

Valve Springs

Crower HD Single

Cryo’d and Polished

Intake Spring Seat Pressure

117lbs

Intake Spring Open Pressure

212lbs @ .500” valve lift

Exhaust Spring Seat Pressure

117lbs

Exhaust Spring Open Pressure

212lbs @ .500” valve lift

Intake Spring Coil Bind Point

.550” valve lift

Exhaust Spring Coil Bind Point

.550” valve lift

Intake Valve Max Recommended Lift

.510”

Exhaust Valve Max Recommended Lift

.510”

Additional

Additional Information

Brand T4S-Cylinder-Heads
MPN No
MSRP No

Important Seller's Note

The Seller, hereby expressly disclaims all warranties either express or implied, including any implied warranty of merchantability or fitness for a particular purpose, and neither assumes nor authorizes any other person to assume for it any liability in connection with the sale of this part(s) and/or service. Buyer shall not be entitled to recover any consequential damages, damages to property, damages for loss of use, loss of time, loss of profits, or income, or any other incidental damages. In addition, expressly excluded is any liability for defects pertaining to safety or performance, by way of ‘‘strict liability’’, negligence or otherwise. In the event of non-payment, the Buyer agrees that the costs of collection including court cost, and reasonable attorney’s fees, shall be recoverable from the Buyer. The Buyer has read and with any transaction, agrees to all of the terms and conditions in connection with the Seller.


Terms: • All Returns/Exchanges Require Written or Verbal Pre-Authorization and RMA Number. • Positively No Exchanges Without This Invoice. • No Refunds On Opened Packages Or Used Parts. • Items Returned Must Be In Original Packaging. • No Refunds On Special Orders. • No Return On IMS Parts. • No Refunds After 30 Days. • 25% Handling Charge On All Returned Items. • No Returns On Electrical Parts. • Refund On Purchases Paid By Check Are Refunded After Check Clears. • Limited Lifetime Warranty on NSC plating provided by Millennium Technologies LLC and subject to their terms and conditions. • There is no warranty on blocks processed with the Nickies Lite direct plating process. • Any Damage Must Be Reported to the Shipper and LN within 24 Hours of Receipt.

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Questions or comments? Feel free to contact us before ordering. Open a support ticket, call 815.472.2939 or email support@lnengineering.com.