286 cc intake ports for big angry LS3 monsters only.
- Built for “plus sized” units with higher compression applications (13:1+).
- Higher rpm (7500+) and/or higher cubic inch builds (427ci+).
- Higher boost levels (30psi+).
- Prime grade stainless steel intake valves, Inconel exhaust valves and CHE bronze guides.
- Fits all standard equipment: valve covers, headers, LS3 intakes, OEM-type LS3 rocker arms.
- Sold per set.
Description
The Monster Series is the first threshold into HP creation far beyond any OEM head.
Frankenstein introduced another level of horsepower when The Monster was brought to life. FED poured our arsenal of precision engineering into a common cylinder head and woke the industry. Intake and exhaust chambers are 5-Axis CNC ported with our latest high performance program, meticulously hand blended and deburred. Our strict quality control processes ensure extreme attention to detail and precise tolerances. High quality components include FED’s premier stainless steel severe duty valves, custom PAC .700” lift valve springs, titanium retainers, bronze guides and hi-temp silicone exhaust o-ring gaskets.
Monster’s crazy cousin “Boost Monster” is now available for power adders. The Boost Monster features CHE mag-bronze valve guides and Inconel exhaust valves for the increased heat. Both the Monster and Boost Monster fit all standard equipment such as valve covers, headers, LS3 Intakes, and OEM-type LS3 rocker arms. (Billet Rocker Stands Available Separately)
Specifications
| Description | Specification | Part Number |
| Min. Bore Dia. | 4.000” | |
| Intake Port Volume | 273cc | |
| Exhaust Port Volume | 112cc | |
| Combustion Chamber Volume | 72cc | |
| Intake Valves | 2.165” / 5.405 OAL | 913005 |
| Exhaust Valves | FED Custom Inonel exhaust valves 1.600 / 5.420 OAL / .290 Tip | 913008 |
| Valve Springs | .700? Lift FED exclusive by PAC | 914005 |
| Retainers | FED Ti-64 Retainer – LS Dual Spring | 914040 |
| Valve Locks | GM Valve Lock | 916051 |
| Valve Spring Locator | FED Steel Valve Spring Locator (Black Oxide) .565 guide / .135 thickness | 914014 |
| Valve Seals | U.S. Seal – Viton High Heat Seal | SPRVS805USS |
| Exhaust Gaskets | FED Custom #227 (Green), 2-1/8 ID x 2-3/8 OD High Temp Silicone 1/8 thick | 914032 |
| Head Bolts: | 6 Bolt | ARP-134-3610 (Gen IV) |
| ARP-134-3609 (Gen III) | ||
| Head Studs: | 7/16? Stud Size for Main 10 Bolts and 8mm Stud Size for Outer Tabs and Deck Studs | ARP-234-4110 (Gen IV) |
| ARP-234-4316 (Gen III) | ||
| Deck: | 0.750? Deck Structure | |
| Head Gaskets: | 4.125” Bore | |
| Pushrods: | 8.100 – 8.250” Length x 3/8” Diam. | |
| Lifters: | Standard | |
| Rockers: | Standard LS3 w/Billet Rocker Stand | |
| w/Billet Rocker Stand – Standard | Shaft Rockers | JESEL – KPS462173 |
| Casting | Casting sourced overseas. Engineered, Machined and Assembled by FED in USA |
