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RS+ Cylinder Heads

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RS+ Cylinder Heads

Item#:07607

Availability: In stock

$3,200.00

  • Castings: AMC

  • Chambers: CNC machined 2.0 914

  • Chamber Step: 95.0 x 1.0mm*

  • Plug angle: 2.0 914

  • Valve sizes: 42mm x 36mm by Manley

  • Standard Springs & Retainers: Crower HD Single springs for 122lbs of seat pressure and 222lbs at .460" lift & Chromoly retainers

  • Upgraded Springs & Retainers: Premium dual Crower set for 150lbs seat pressure & 320lbs at .530” valve lift & Crower Chromoly retainers ($200 upcharge)

  • Keepers: Hardened and ground for clearance

  • Intake Ports: Fully CNC machined with hand finished details.

  • Exhaust Ports: Fully CNC machined with hand finishing.


ALL CYLINDER HEADS ARE SPECIAL ORDER AND MUST BE ORDERED SEPARATELY AND PAID FOR WHEN ORDERED. All cylinder heads are sold only in pairs. PLEASE ALLOW 4 WEEKS TO CREATE YOUR CYLINDER HEADS.

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Details

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.

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.