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Monster Flow, Part 3—LS CNC Porting

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By Jason Reiss

Photos Courtesy of Frankenstein Engine Dynamics

Tech Specs:

GM Stock LS1 Cathedral, Stage 1

(243/799/317/241/853 castings)

Reuse Factory Intake Valves: 2.000-inch

Reuse Factory Exhaust Valves: 1.550-inch

Intake Volume: 224cc

Exhaust Volume: 82cc

Intake Peak Flow: 302 cfm

Exhaust Peak Flow: 240 cfm

Stock Chamber

Seats: Stock Iron

Guides: Stock Powdered Metal

Minimum Bore: 3.900-inch

Intake Manifold Recommendation: FED LowPro (Sold Separately)

Stock Rockers. Trunnion Upgrade Kit Recommended (Sold Separately)

Springs: FED .660-inch Dual LSX Spring Kit with Titanium Retainers

Upgrade to Stage 2 Specs adds:

Manley Stainless Intake Valves: 2.040-inch

Manley Stainless Exhaust Valves: 1.575-inch

Intake Peak Flow: 310 cfm

Tech Specs:

GM LS3 821/823/LSA, Stage 1

Reuse Factory Intake Valves: 2.165-inch

Reuse Factory Exhaust Valves: 1.590-inch

Intake Volume: 288cc

Exhaust Volume: 93cc

Intake Peak Flow: 390 cfm

Exhaust Peak Flow: 260 cfm

Seats: Stock Iron

Guides: Stock Powdered Metal

Minimum Bore: 4.000-inch

Intake Manifold Recommendation: FED Billet Low Pro

Stock Rockers or Jesel Smith Brothers Trunnion Upgrade Kit Recommended

Springs: FED .660-inch Dual LSX Spring Kit with Titanium Retainers

Upgrade to Stage 2 Specs adds:

Manley Stainless Intake Valves: 2.180-inch

Manley Stainless Exhaust Valves: 1.600-inch

Intake Volume: 292cc

Intake Peak Flow: 394 cfm

Exhaust Peak Flow: 266 cfmS

The LS2/LS6 brothers also see large gains, with 29.1-percent improvement on the intake side, and 23.7-percent increase on the exhaust side with the Frankenstein ports carved into the castings.

Tech Specs:

GM 5.3 L83, Stage 1

Reuse Factory Intake Valves: 1.930-inch

Reuse Factory Exhaust Valves: 1.550-inch

Intake Volume: 260cc

Exhaust Volume: 114cc

Chamber: 57cc

Seats: Stock Iron

Guides: Stock Powdered Metal

Minimum Bore: 3.900-inch

Stock Rockers, Trunnion Upgrade Kit Recommended (Sold Separately)

Springs: FED .660-inch Dual LSX Spring Kit with Titanium Retainers

With 18.9-percent improvement on the intake side and 17-percent gains on theexhaust side, even the naturally aspirated LS7 engine can see big gains with a set of ported heads on top. Paired with the right camshaft, maybe a compression increase, and some boost? The sky is the limit.

Source

Frankenstein Engine Dynamics

www.Frankensteined.net


Mike Galimi
Mike Galimi is the Director of Content & Marketing at ProMedia Publishing and Events with nearly 20 years of experience in motorsport writing and photography.
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