Custom Engine Blocks & Heads - Maximize Performance!
Crafting Custom Race Solutions
Racing Blocks and Cylinder Heads available from Jason Line Performance.
Our performance engine blocks are custom-designed with precision and performance in mind. Inspired by Pro Stock race technology, these blocks are designed to allow a more even flow of lubricant to the entire engine for increased reliability and performance. JLine Performance blocks are NHRA Stock and Super Stock approved.
Blocks and Cylinder Heads
Iron Blocks
Aluminum Blocks
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All of our aluminum blocks are cast using pure Ingot aluminum alloy
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4140 billet main caps
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ORB freeze plugs
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ARP 12-point fasteners
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Blueprint specs machined to precise size
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No camshaft, crankshaft, or lifter bore honing required
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Oiling system designed for balanced lifter lubrication with infinite restriction options
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Mains are grooved or have a secondary oiling hole
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Ductile iron sleeves supplied by Advanced Sleeve
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All plugs and fittings are provided with the block
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Every block is inspected and measured before shipment using ultra-high-accuracy CMM software
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All parts are made and manufactured in the USA by American companies
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Machining by Schwartz Machine
Meticulously Engineered - Cylinder Heads
We prioritize precision machining and meticulous review for every cylinder head valve job we perform. We use C.H.E. valve guides and valve seats, as well as respected Newen fixed-turning CNC single-point valve and seat guide equipment for a 2.350 x 1.900 50° valve job.
24° CONVENTIONAL BIG BLOCK CHEVROLET CYLINDER HEAD:
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Fully CNC ported
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360cc intake runner volume
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150cc export volume
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125cc combustion chamber volume
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All fastener holes are form-tapped for increased
thread strength
Product Specifications
Available Block Configurations
ALUMINUM AND IRON BLOCKS... 9.800 deck height (aluminum or cast iron) Up to 60mm roller bearing cam tunnel Standard cam location or +.400 raised cam location NHRA Stocker 396 bore blocks starting at 4.089 bore Bore sizes: 4.500 – 4.600 9.800 aluminum ZL1 configuration is also available in 4.300 bore size 10.200 deck height +.400 raised cam configuration and up to 60mm roller bearing cam tunnel Bore sizes: 4.500 – 4.600 (cast iron), 4.500 – 4.600 (aluminum)
JLine Performance Cylinder Heads
24° CONVENTIONAL BIG BLOCK CHEVROLET CYLINDER HEAD ✓ Fully CNC ported ✓ 360cc intake runner volume ✓ 150cc export volume ✓ 125cc combustion chamber volume ✓ All fastener holes are form-tapped for increased thread strength
Iron Blocks
**Custom bore sizes available up to 4.625
Aluminum Blocks
Aluminum Blocks
**Custom bore sizes available up to 4.625
Cylinder Heads
**Ti valves are Chrome Nitrate Coated (CRN) Coated
**SS = Stainless Steel
Our Journey - About JLine Performance
Meet Jason Line
JLine Performance has its roots in the engine room at KB Racing, a renowned NHRA Pro Stock team founded by Ken and Judy Black.
Jason Line, a three-time Pro Stock world champion, started drag racing in MN and working in his father’s garage before gaining experience at Joe Gibbs Racing. He joined Black's Pro Stock shop in 2003, where he enhanced his skills while contributing to their success.
While his driving accolades are legendary, Line’s heart always remained in the engine shop. Line collaborated with a talented team, including cylinder head specialist Dan Blabolil, to develop high-performance parts. JLine Performance embodies decades of dedication to achieving engine efficiency, reliability, horsepower, and victory.
Meet Jack Line
For Jack Line, progress didn’t come from shortcuts - it came from wanting to be better than the next guy. That mindset drove him to learn, fabricate, and refine his own program, turning competition into motivation and knowledge into performance.
PRI 2025 Interview
We take great care in packaging our products to prevent damage during transport. To simplify your delivery, we provide an attached lifting strap compatible with your engine hoist, allowing for an effortless transition from the truck to your shop.
Commitment to Secure Transit
