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245cc Aluminum LS1 Cylinder Heads Part # Description Combustion Chamber 1680 Large Bore (4.000+) 65cc 1690 Large Bore (4.000+) 73cc
| 245cc Street Head Flow Chart | |||||||
| .200 | .300 | .400 | .500 | .550 | .600 | .650 | |
| Int | 164 | 233 | 290 | 332 | 347 | 356 | 360 |
| Exh | 131 | 185 | 227 | 247 | 249 | 257 | 267 |
Test conducted at 28" of water (pressure) on Superflow 600
Bore Size: 4.155", 3/4" radius plate exhaust, 1 3/4" curved pipe
| Basic Package Components | |
| 100% CNC Ported Combustion Chambers | |
| 100% CNC Ported Exhaust Ports | |
| 100% CNC Ported Intake Ports | |
| Competition 5-angle Valve Job | |
| 8mm Bead Lock Intake Valve, 2.165" x 4.900" Overall Valve Length |
AFR7211 |
| 8mm Bead Lock Exhaust Valve, 1.600" x 4.900" Overall Valve Length |
AFR7228 |
| PAC Racing Spring 1.270" OD Hydraulic Roller Dual Valve Spring, 155 lbs. on seat, Max RPM 7000-7200 |
AFR8019 |
| 7° Titanium Retainers 1.245" O.D x .885" I.D x .655" I.D |
AFR8512 |
| 7° Bead Lock Valve Keepers |
AFR9007* |
| Viton Valve Seals .600" O.D x .495" I.D |
AFR6612 |
| Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D |
AFR8042 |
| Ductile Iron Intake Valve Seats 2.200" O.D x 1.750" I.D x .375" Deep |
AFR9060 |
| Ductile Iron Exhaust Valve Seats 1.650" O.D x 1.350" I.D x .375" Deep |
AFR9069 |
| 8 mm Bronze Valve Guides .502" O.D x 2.100" O.A.L |
AFR9051 |
| Specifications & Features: | |
| Material |
A356 Aluminum |
| Intake Port Volume |
245cc |
| Intake Port Dimension |
3.315"H x 1.145"W x 11/32 top 13/32 bottom |
| Intake Port Location |
Stock |
| Exhaust Port Volume |
88cc |
| Exhaust Port Dimension |
1.495" H x 1.730" W |
| Exhaust Port Location |
Stock |
| Combustion Chamber Size |
65cc or 73cc |
| Valve Cover Bolt Pattern |
Center Bolt |
| Valve Angle |
15° |
| Valve Spring Pocket Diameter |
1.510" O.D |
| Max Valve Spring Pocket Machining |
1.525" O.D |
| Deck Thickness |
.750" |
| Minimum Bore Diameter |
4.000" |
| Flat Mill - 65cc chamber |
.006" per cc 58cc Maximum |
| Flat Mill - 73cc chamber |
.006" per cc 65cc Maximum |
| Minimum Cross Sectional Area |
2.680 sq. in. |
| Spark Plug Dimensions |
14mm x .750" w/Gasket Seat |
| Categories | Engine Components |
|---|---|
| Manufacturer Part Number | 1680 |
| Brand | Air Flow Research |
| Part Type | Cylinder Heads |
| Vehicle Make | Chevrolet |
| Engine Type | LS Series |
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