WEAPON-X: 405cfm LT4X 4.125" Big Valve Cylinder Heads [Camaro ZL1, C7 Corvette Z06 ZR1, CTS V, LT4 LT5]
Vendor: WEAPON-X Motorsports
The 2015+ C7 Corvette Z06, 2019+ C7 Corvette ZR1 LT5, and 2016+ 6th gen Camaro ZL1, and the 2016+ CTS V LT4 out of the box has some very high flowing heads with approximately 295 cfm. For some of us, this is just isn't enough. We need more flow, a more aggressive cam, and want to see nearly 650 naturally aspirated rear wheel HP with our big valve head setup, first debuted on our shop car WEAPON7 in the summer of 2014! We offer complete engine packages with the sleeved LT1 LT4 and LT5 blocks with custom spec pistons for these heads up to 4.165"!
Here's what we do! Fully CNC ported intake and exhaust ports, custom titanium intake and stainless exhaust valves, valve job, custom full radius exhaust valve job, intake and exhaust bowl blending, optional milling for increased compression ratio.
Stage 1 is CNC only
Stage 2 is the trend for boosted engines with smaller ports for higher airflow velocity
Stage 3 is the fully ported windows and all
Intake port volume: 295 cc (peak stock flow 309 cfm)
Exhaust port volume: 106 cc (peak stock flow 194 cfm)
Stock Combustion Chamber Size: 60 cc
Stock intake valve size: 2.125" 96.2 grams (hollow stem)
Stock exhaust valve size: 1.590" 73.5 grams
Here are some teaser specs of the new Stage 2 CNC porting option:
Intake port volume: 310+cc
Exhaust port volume: 105+cc
Picked up 80 cfm by .600 lift!
Core charge is 100% refundable within 15 business days if you choose to return your LT1 heads.