ProMaxx 3146A XXtreme 245 LS1/LS2 Cathedral 3.898 Small Bore 59cc Hydraulic Roller .650 Heads

Name: ProMaxx 3146A XXtreme 245 LS1/LS2 Cathedral 3.898 Small Bore 59cc Hydraulic Roller .650 Heads
SKU: 3146A
Price: 2239.99 USD
Availability: InStock

Fits Vehicle: LS1/LS2 Cathedral Port 3.898 Small Bore

SKU: 3146A

The 245 cathedral head is the best of both worlds with the 11-degree valve angle and cathedral port shape. No cathedral head can come close. Independent dyno tests have shown an LS1 to produce over 490 horsepower to the wheel through a 4l60 transmission with factory manifold and cam on pump gas.

Features:

LS 245cc Extreme Cathedral 3.898min 2.08/1.60 59cc .650 Tool Steel Associated Springs Pair
Requires 3.898″ bore minimum and LS3 intake rocker
Pro-designed ports & chambers
245cc as-cast port designed and tested in the USA
Ultra-smooth 356-T6 Aluminum Casting
5-angle valve job
63CC or 59CC Chamber size or 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
Utilizes 2.08 intake valve and 1.60 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
Outperforms other comparable heads in the industry
Accessory brackets may require different bolts
Sold in Pairs

Flow Chart

2.08/1.60

Flow Data @ 28″ water
lift	200	300	400	500	600	700	800
Int	146	220	272	320	338	345	348
Ext	107	150	200	210	220	228	231

Cylinder Head Options

Part No	Description	Valve Sizes	Chamber Volume	Max Lift
3140	245 LS XXTREME 3/2/1 Bare	2.08/1.60	63cc
3141A	245 LS XXTREME 3/2/1 Assembly	2.08/1.60	63c	.650
3141P	245 LS XXTREME 3/2/1 Assembly	2.08/1.60	63cc	.650
3142	245 LS XXTREME 3/2/1 Assembly	2.08/1.60	63cc	.650
3143	245 LS XXTREME 3/2/1 Assembly	2.08/1.60	63cc	.700
3144	245 LS XXTREME 3/2/1 Assembly	2.08/1.60	63cc	.800

Part No	Description	Valve Sizes	Chamber Volume	Max Lift
3145	245 LS XXTREME 3/2/1 Bare	2.08/1.60	59cc
3146A	245 LS XXTREME 3/2/1 Assembly	2.08/1.60	59cc	.650
3146P	245 LS XXTREME 3/2/1 Assembly	2.08/1.60	59cc	.650
3147	245 LS XXTREME 3/2/1 Assembly	2.08/1.60	59cc	.650
3148	245 LS XXTREME 3/2/1 Assembly	2.08/1.60	59cc	.700
3149	245 LS XXTREME 3/2/1 Assembly	2.08/1.60	59cc	.800

Technical Specs

Combustion Chamber ……53cc-66cc
Weight …………………………66 lbs.
Intake Runner ……………. 245cc
Exhaust Runner …………..
Intake Valve Size …………2.165”-2.200″
Exhaust Valve Size …….. 1.57″-1.60””
Spring Pressure

Hydraulic Roller .650 max lift

Closed …………………… 155 lbs. @ 1.800”-
Open …………………….. 425 lbs. @ 1.150”

Valve Guide ……………Manganese Bronze
Valve Seal Material … Viton
Retainer Material ……Titanium or Tool Steel
Valve Job ……………… 5-angle
Valve Spacing ………. OEM LS3
Valve Seats ……………Hardened Steel