AFR 345cc BBC Chevy Magnum Aluminum "As Cast" Cylinder Heads - Air Flow Research 2101 3450 - TREperformance.com
AFR 345cc BBC Magnum "As Cast" Cylinder Heads
FREE Shipping on ALL AFR Heads!!!
If "Dirty Harry" drove a racecar, it would certainly be fitted with a pair of our 345 or 357 "Magnum" cylinder heads. If huge horsepower is what you are searching for, either of these castings will certainly deliver. With our Race Ready "As Cast" 345cc flirting with 400 CFM and our fully CNC ported 357cc flowing 425 CFM, these heads represent the ultimate in airflow for your BB Chevrolet. These heads were targeted at larger cubic inch engines (509-632 CID) looking for maximum horsepower and rpm capability with a primary operating range of 3500-8000 rpm's (This range is an average and will vary with engine displacement and component selection). These heads will also provide impressive torque figures at higher rpm levels. Blown, turbo, and nitrous engines will especially like the larger, higher flowing intake ports. These heads will work best with camshafts exceeding .750 gross valve lift to make better use of the substantial airflow found in the higher lift range. The 345cc heads come standard with AFR's trademark .750" thick head deck, reinforced rocker stud bosses, and are equipped with premium one piece stainless steel 2.300" intake valves and 1.880" exhaust valves. Standard combustion chamber volume is 115cc's on the 345 "As Cast" model. Properly selecting the correct cylinder head depends on a large number of variables. Please consult with one of our sales technicians to assist you in making the best decision for your particular application.
Optional stud girdle required for 2° rolled valve angles and 1" longer head bolts needed on four bottom exhaust bolt holes. Longer pushrods might also be required.
|Basic Package Components||Part #|
|5-angle valve job|
2.300" stainless steel
|Exhaust Valve, 1.880" stainless steel||AFR #7631|
|1.625 O.D. Solid Roller PAC Racing Spring, 275lbs on seat, .850 Maximum Lift||AFR #8031
|10° Chrome Moly Retainer||AFR #8518|
|10° Valve Locks||AFR #9005|
|Guide Plates||AFR #6109|
|Viton Valve Seals||AFR #6611|
|Hardened Spring Cup||AFR #8046|
|Intake Valve Seats||AFR #9062|
|Exhaust Valve Seats||AFR #9064|
|AFR BB Chevy 7/16 Exhaust Studs||AFR #6406|
|AFR BB Chevy 7/16 Intake Studs||AFR #6407|
|Specifications, Features, and Optional Supporting Components|
|Head Torque||75 ft. lbs|
|Intake Port Gasket, 1.720" x 2.450" with 1/2" radius, Fel-Pro #1275||AFR #6856
|Exhaust Port Gasket||AFR #6858|
|Head Gasket||AFR #6850|
|Head Studs||AFR #6307|
|Head Bolts||AFR #6308|
|Head Bolt Washers||AFR
|Stud Girdle||AFR #6210|
|Suggested Manifold||Dart #6200, #6201, & #6203|
|Suggested Manifold||Brodix HVH #2000, #2001, #2005, & #2006|
|Spark Plug Starting Range||Champion C59C Autolite 3932|
|Combustion Chambers||115cc As Cast, 121 w/ CNC Chambers|
|Spring Pocket||Can be cut to 1.750,
|Valve Angle||24°/4° Intake, 15°/4° Exhaust|
(Milling options available) 104cc max
||.009" per cc|
|Flat Mill (Milling
available) As Cast 108cc max, CNC 114cc max
||.006" per cc|
port match you intake manifold to any Fel-Pro
gasket as it does not
precisely match AFR heads.
Note: Milling head deck will affect flow numbers.
Angle mills might require a .120 thick intake
- Item Requires Shipping
- 80.0 lbs.
- W24.0000” x H12.0000” x L24.0000”
- Free Shipping!
- This item ships in its own box.
- FREE continental USA ground shipping on ALL AFR Cylinder Heads