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ProMAXX C/H_XXtreme_GM LS1/LS2_225cc_2.125/1.600_63cc_Cathedral Port_4.000 Large Bore_Hydraulic Roller_.650 Lift_Tool Steel Retainers_PAC Springs

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Ships from Supplier

Price $2,410.00

Product Code: PMX-3151P

Description

Technical Specs

The XXTREME LS 255 cathedral port head utilizes an 11 degree valve angle to push it to the front of all cathedral aftermarket cylinder heads. Size for size, no one can touch this bad boy. If you have a 4.000 inch plus bore size engine and need cathedral heads, look no further to push your power to the XXTREME.

Requires 4.000 bore minimum and LS3 intake rocker.

Features:

Professionally designed ports & chambers
255cc as-cast port designed and tested in the USA
Ultra-smooth 356-T6 Aluminum Casting
5 angle valve job
59 or 63cc chamber size with additional options available
11 Degree Valve Angle
Diamond honed guides
Built-in raised valve cover rail
Monster .750 deck thickness
Billet LS3 OEM Rocker Stand
For use with standard or 6 bolt pattern
Large spring pockets

Assembled heads feature:

Utilizes 2.125 intake valve and 1.600 exhaust valve (Larger sizes available upon request)
Multiple spring options
Assemblies include: 21-4N stainless 1pc swirl polished back cut valves
Machined and Assembled in the USA

Flow Chart
2.125 Intake _ 1.600 Exhaust

Lift	.200	.300	.400	.500	.600	.700	.800
Intake	145	220	275	325	347	361	363
Exhaust	60	115	180	215	230	245	252

Flow Data: cfm @ 28 inches of Water

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Cylinder Heads > ProMAXX Cylinder Heads > Chevrolet _ LS Series