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Engines and Components› Cylinder Heads and Components

Frankenstein

M311 LS3 Cylinder Heads

Name: M311 LS3 Cylinder Heads
Brand: Frankenstein
SKU: 113005-LS3

$3,492.00

SKU: 113005-LS3

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Overview

The Frankenstein M311 LS3 Cylinder Heads are performance-oriented cylinder heads designed to significantly increase horsepower. These heads feature a 5-axis CNC-ported intake and exhaust chamber, meticulously hand-blended and deburred for optimal flow.

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The Frankenstein M311 273cc LS3 Cylinder Heads represent a substantial upgrade over OEM heads, engineered to deliver horsepower far beyond stock capabilities. Each head is fully CNC ported with a 5-axis high-performance program, then meticulously hand-blended and deburred to ensure extreme attention to detail and precise tolerances, backed by strict quality control processes. These "Monster Series" heads feature a 68cc chamber volume, a 273cc intake port, a 112cc exhaust port, and an 11° valve angle. The exhaust ports are O-Ringed with hi-temp silicone o-rings included, and 2" headers are recommended for optimal performance. Built to order, these cylinder heads have an approximate lead time of 4-6 weeks for completion. Both the standard "Monster" and the "Boost Monster" versions are designed to fit all standard equipment, including valve covers, headers, LS3 intakes, and OEM-type LS3 rocker arms, though billet rocker stands are available separately.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

Brand	Frankenstein
Part Number	113005-LS3
Category	Engines and Components

Videos

PRI 2018 Interview - NEW Frankenstein LS Cylinder Heads!

Frankenstein M311 BoostMonster Heads

Rocker Arms - Which ones to get!? -Frankenstein Tech Series - S1Ep7

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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