BB-3 XTRA 363 Series Cylinder Heads freight paid in the lower 48 states!
Cylinder Head Specifications
Intake Port Volume: 363cc - Rectangle Port
Combustion Chamber Volume: 119cc
Valves: 2.300"' dia. × 5.568"' o.a.I. Intake (trick titanium) / 1.880"' dia. × 5.494" o.a.l. Exhaust (11/32"
Stem Diameter )
Valve Springs: 1.645" Diameter - Open Pressure: 945
Ibs.; Closed Pressure: 330 Ibs.; Installed Height:
2.100"; Max Lift: 875"
Spring Retainers: 1.645"' 10° Titanium
Rocker Studs: 7/16"
Guide Plates: 3/8"
Valve Seals: 11/32"
Spark Plug Configuration: Angled Facts and Related Components
Torque Heads: 70 ft-lb.
Torque Rocker Studs: 40-45 ft-lb.
Intake Gasket: Brodix p/n 158-MG2001, Fel-Pro p/n 375-1252-3, Cometic p/n 245-C5428
Head Gasket: 4.540"' Bore - Fel-Pro p/n 375-1017, Cometic p/n 245-C5433; 4.600" Bore - Fel-Pro p/n 375-1057, Cometic p/n 245-C5434
Exhaust Gasket: Fel-Pro p/n 375-1411 or Cometic p/n
245-C5429
Head Bolts: ARP p/n 070-135-3606, Manley p/n
660-42192
Head Studs: ARP p/n 070-235-4702 (12-point)
Spark Plug Specs: 14mm Thread, 750" (3/4") Reach, Gasket Seat
Valve Angle: 24° and 4° Intake, 15° and 4° Exhaust Angle Milling: 0066" per cc
Flat Milling: 0050" per cc
Valve Angle: 24° and 4° Intake, 15° and 4° Exhaust
Angle Milling: 0066" per cc
Flat Milling: 0050" per cc
Pushrod Slots: Standard
Pushrods: Check pushrod clearance with head installed on the engine block before final assembly
Stud Girdle: Standard, Brodix p/n 158-1230
Rocker Arms: Standard
Lifters: Standard
Pistons: 2° Valve Rolled Piston Exhaust Pattern: Raised .600"
Spring Pockets: May not be cut any larger or deeper than 1.625"
Accessory Bolt Holes are Drilled
Recommended Intake Manifold: Brodix SA 2013 (p/n
158-SA2013) / SA 2022 (p/n 158-SA2022) / BM
2017* (p/n 158-BM2017) / BM 2027* (p/n 158-
BM2027) -
