BBC 4.9" Bore Space Racing Cylinder Head Race Winning Performance out of the box...
For GM Motorsports DRCE 4.9" Bore Space Block
Pro-Stock Port Design promotes high intake port velocity
54cc Combustion Chambers allow lighter pistons, more compression and better combustion
Concentric head bolt pattern
12 Degree Hi-Flow Valve Angle Design
This unique 4.9" bore spaced cylinder head uses the same ingenuity that powered Ray Franks to the 4th spot in NHRA, Speed-Pro, 200mph Club.
Already precision ported, there are no additional porting or modifications required or recommended, allowing for a true pro-style, out-of-the-box cylinder head.
This head is used in Outlaw Pro-Stock, NHRA Competition Eliminator, Tractor/Truck Pullers, Marine, Pro-Modified, Bracket Racing, Anywhere power is essential.
Technical Details
Material - A356 Primary Ingot Aluminum Valve Angle - 12 Degree Intake Ports - 470cc Exhaust Valve - 1.80 to 1.90" Intake Valve - 2.450" to 2.525" Combustion Chamber - 54cc Deck Thickness - Approx 3/4" deck for Nitrous and Blown applications Spark Plugs - Use Gasketed 3/4" Reach Plugs Valve Train - Uses T&D or Jesel Shaft Mounted Rocker Systems Bore Spacing - 4.9" GM DRCE Motorsports Blocks Valve Guides - Bronze Valve Seats - Copper Alloy Intake Port Design - Pro-Stock Modified Oval Port Intake Manifold - Use Pro-Filer PN 170 Valve Covers -Pro-Filer PN 168-B Rockers - Shaft rockers (T & D, Jesel) Valve Springs - Up to 1.625" Dia RPM Range - 5500-9500 RPM
Part Numbers
165 Series 4.9" Bore Space 12deg 470cc Spread Port Cylinder Head
PN
Description
Price
165
Raw Casting
$1125.00 ea
165-01
Machined Only
$1300.00 ea
165-02-5
Copper Alloy Valve Seats & 5/16 Bronze Guides
$1785.00 ea
165-02-11
Copper Alloy Valve Seats & 11/32 Bronze Guides
$1785.00 ea
165 Series 4.9" Bore Space 12deg 470cc Spread Port Cylinder Head SOLID - No Water Passages
PN
Description
Price
165S
Raw Casting
$1225.00 ea
165-01S
Machined Only
$1400.00 ea
165-02-5S
Copper Alloy Valve Seats & 5/16 Bronze Guides
$1885.00 ea
165-02-11S
Copper Alloy Valve Seats & 11/32 Bronze Guides
$1885.00 ea
165 Series Cylinder Head Accessories
PN
Description
Price
IR255060KF
Cometic Single Intake Gasket for 166 & 165 Series Heads Qty 2 required for new installations (replaces PN 166-IG)
$12.20 ea
EX383064AM
Cometic Single Exhaust Gasket for 166 & 165 Series Heads Qty 2 required for new installations (replaces PN 166-EG)
$8.50 ea
VC058094KF
Single Valve Cover Gasket for 166 & 165 Series Heads Qty 2 required for new installations (replaces PN 166-VCG)
