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Vehicle Info NeededTOP STREET PERFORMANCEPART NUMBER: 743-JM4500
JM4500 Chevy LS1, LS6 Aluminum Cylinder Head, GM 243 Style, Single
$49996
Ships on 09/14/2026
Lowest Price GuaranteeChevy LS1, LS6 Aluminum Cylinder HeadGM 243 Style Single
Top Street Performance JM4500 Features:
If you're looking to rebuild your old Chevy LS powerplant, you can't go wrong with a set of performance cylinder heads. TSP's heads are cast from premium aluminum for improved weight and heat management over the old iron. They are engineered and CNC-ported for maximum horsepower and torque. This bare assembly is a great starting point for a performance engine build. It's designed for maximum flow and performance in the hands of a skilled builder or machine shop. It features a thick deck to help resist warping and comes with threaded bolt holes on the ends for an easy install.Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
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Part TypeCylinder Head
BrandTOP STREET PERFORMANCE
Package Height8.0
Package Width12.0
Package Length24.0
Weight24.0 PG
Vendor Part NumberJM4500
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
