Unleash serious horsepower with Dart’s Pro 1 CNC-ported aluminum cylinder head, part #11971143P. Engineered for high-compression or boosted small-block Chevy builds, each head is 100 % CNC-machined for consistent flow and maximum efficiency. Key features include:
-
Large 227 cc intake runners & 66 cc CNC chambers for outstanding air-flow on 327-400 cid SBC engines
-
Assembled and ready to run with 2.080"/1.600" stainless valves, 1.550" dual springs, 7° retainers & machined locks
-
Angle-plug design improves spark-access and header clearance for street/strip or bracket racing
-
Lightweight A356-T6 aluminum casting (≈ 26 lb each) cuts front-end weight and dissipates heat faster than iron
-
Stock valve angle & standard accessory bolt pattern—drop-in fit with off-the-shelf pistons, rockers and intake manifolds
-
Compatible with unleaded fuels thanks to hardened exhaust seats & manganese-bronze guides for long life
- Price is for 1 cylinder head
Whether you’re chasing ETs at the drag strip or building a stout street bruiser, Dart Pro 1 heads deliver the flow you need to support 600-plus horsepower with rock-solid reliability and room to grow. Order today—Virtual Speed Performance ships fast and backs every sale with real racer tech support.