afr cylinder head, 23 sbc 220cc competition package heads, standard exhaust, 65cc chambers, assembled, pair

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Seller's Description

AFR's 220cc "Race Ready" and "Competition" heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. This is AFR's largest, best flowing head for use with conventional rocker arms. Recommended for race applications or radical "Pro Street" style builds.

220cc Race Ready™ Head Flow Chart
	.200	.300	.400	.500	.550	.600	.650
Int	155	210	260	295	304	312	318
Exh	116	162	204	220	225	229	233

220cc Competition Head Flow Chart
	.200	.300	.400	.500	.550	.600	.650	.700
Int	145	207	263	299	312	316	322	326
Exh	120	160	214	225	229	240	244	245

Test conducted at 28" of water (pressure) on Superflow 1020

Bore Size: 4.155", intake 3/4" radius plate exhaust, 1 7/8" curved pipe

Specifications & Features:
Material	A356 Aluminum
Intake Port Volume	220cc
Intake Port Dimension	2.220" H x 1.310" W x 3/8 Radius
Intake Port Location	Stock
Exhaust Port Volume	80cc
Exhaust Port Dimension	1.420" H x 1.545" W
Exhaust Port Location	.250" Raised
Combustion Chamber Size	65cc or 75cc
Valve Cover Bolt Pattern	Perimeter Bolt
Valve Angle	23°
Valve Spring Pocket Diameter	1.580" O.D
Max Valve Spring Pocket Machining	1.750" O.D
Warning: Do not machine spring pad any deeper.
Deck Thickness	.750"
Minimum Bore Diameter	4.000"
Flat Mill	.006" per cc 60cc Maximum
Angle Mill	.009" per cc 55cc Maximum
Note: Angle mills might require .120" Thick intake gasket.
Minimum Cross Sectional Area	2.180 sq. in.
Spark Plug Dimensions	14mm x .750" w/Gasket Seat