RM 24º Sniper-XL Fully CNC Cylinder Heads

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Product Description

Sniper-XL Fully CNC Cylinder Heads

Certain classes mandate “Non raised port” 24° conventional BBC cylinder heads. Reher Morrison and Profiler have come up with the next generation BBC conventional head for these classes. Instead of taking a current head platform and trying to optimize it further, we started with a clean sheet of paper! We optimized the over all design of the standard port location BBC cylinder head and many changes where made to the overall design but all where internal. Externally the head is 100% conventional and set side by side is almost indistinguishable from any other aluminum 24° BBC cylinder head. The main difference is valve sizing, location and port efficiency. These modifications and optimizations add up to a 60-80+hp increase.

(1) Non raised port.
(2) Floor to deck measurement (495-.500 off deck)
(3) Completely re-designed valve train for high RPM stability.
(4) Increased fulcrum length rocker arms for better valve train geometry with cams in excess of .850” lift.

Material: 355-T61 alum alloy
Comb Chambers:121cc
Intake Valve Dia: 2.400”
Intake Port Dim: 1.780”w x 2.600”h
Int Port Location: Stock (floor is .500 from deck)
Intake Gasket: Mr. Gasket# 121
Exh Valve Dia.: 1.850”
Exh Port volume: 140cc
Exh Port Location: Raised .300” STD bolt pattern
Exhaust Gasket: Fel-Pro 1412.
Flow, Intake: 377 cfm @ .500 – 488@ .800 – 499cfm @ .900
Flow, Exhaust: 325 cfm @.800 lift/28”
Spark Plug: .750” reach, gasketed. Autolite AR3933 Street AR3924

(This is a very specialized cylinder head and is NOT a direct bolt on replacement. Custom order pistons, valve train, valve covers and other components will be needed.)

FLOW DATA RM SNIPER-XL 275 cc
Lift
Exhaust
Intake
0.200
124.5
165.8
0.300
171.6
250.5
0.400
212.8
321.2
0.500
266.0
382.8
0.600
285.1
434.4
0.700
301.6
466.5
0.800
313.4
487.4
0.900
323.8
499.8
1.000
328.2
514.0