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Big Block Chevy
345cc Rectangle Magnum "As Cast"
357cc Rectangle Magnum Fully CNC Ported
AFR's Magnum Series!

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. Our 357 “Magnum” flows over 415 CFM @ .700 valve lift! No other production style BB Chevy head even comes close. Both of 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.Both of 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. Both the 345cc and the 357cc 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 119cc’s on the 345 “As Cast” pieces, while our fully CNC ported 357 version comes with a 121cc chamber. Both are available with an optional 114cc combustion chamber as well. 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.
(Flow Charts at bottom of page)

** CLICK HERE NOW for the Absolute LOWEST Pricing on AFR Cylinder Heads! Our prices are so low they won't let us show you online, so click here or call us right now at (603) 378-0090 - you'll be glad you did!)
345cc "As Cast" & 357cc Fully CNC Ported BBC Heads
Pairs of Cylinder Heads Complete With Parts and Ready to Install
Description Part # Price/Pair
345cc As Cast, bare w/valve job, no porting, NO PARTS, ready for assembly  119cc 3450 Call/email for
lowest price!
345cc As Cast, Race Ready, complete w/parts  119cc 2110 Call/email for
lowest price!
345cc As Cast, bare w/valve job, w/CNC chambers, NO PARTS, ready for assembly  121cc 3450-1 Call/email for
lowest price!
345cc As Cast, Race Ready, w/CNC chambers, complete w/parts  121cc 2110-1 Call/email for
lowest price!
357cc Fully CNC Ported w/valve job, NO PARTS, ready for assembly , 121cc 3570 Call/email for
lowest price!
357cc Fully CNC Ported, Competition Package, complete w/parts , 121cc 2010 Call/email for
lowest price!
Note: Optional stud girdle required for 2° rolled valve angles and 1” longer head bolts needed on four bottom exhaust bolt holes.
 
Basic Package Components:
- Competition 5-angle Valve Job
- Intake Valve, 2.300” stainless steel, AFR #7626
- Exhaust Valve, 1.880” stainless steel, AFR #7631
- 1.550” OD Roller Dual Valve Spring with dampner,
   240 lbs. on seat, .750” maximum lift, AFR #8003
- 10º Chrome Moly Retainers, AFR #8510
- 10º Chrome Moly Valve Locks, AFR #9005
- Valve Seals, AFR #6611
- Hardened Shims, AFR #8044
- Intake Valve Seats, AFR #9062
- Exhaust Valve Seats, AFR #9064
- Bronze Valve Guides Intake, AFR #9045
- Bronze Valve Guides Exhaust, AFR #9046
- Guide Plates, AFR #6109
- 7/16" Exhaust Rocker Stud AFR #6406
- 7/16" Intake Rocker Stud AFR #6407
- All Accessory Holes are Predrilled & Tapped!
Specifications, Features, and Supporting Components
- Head Torque 75 Ft. Lbs.
- Intake Port Gasket, 1.775” x 2.500” with 1/2”
   radius AFR #6856
- Exhaust Port Gasket AFR #6858
- 4.540 bore, Fel Pro #1017, AFR #6850
- Mark V-VI-up to 4.500 Bore Fel-Pro #17048 or #1047
- Mark V-VI-4.500 to 4.600 Bore Fel-Pro #17049
- Head Bolts & Studs Standard ARP, AFR #6308
   #6307 #6306
- Head Bolt Washers Manley, AFR #6320
- Stud Girdle AFR #6210
- Sugg.. Manifold Edelbrock #2907
   AFR #5500 & #5502
- Dart #6200, #6201, #6202 & #6203
- Brodix HVH #2000, #2001, #2005 & #2006
- Spark Plug Starting Range Champion C59C
   Autolite 3932
- Combustion Chambers 119cc
- Spring Pocket can be cut to 1.750, no deeper.
- Valve Spacing Standard
- Rocker Arms Standard
- Valve Angle 24º/4º Intake, 15º/4º Exhaust
- Angle Mill (milling avail), 102cc Maximum .009” per cc
- Flat Mill (milling avail), 114cc Maximum .006” per cc
Note: Milling head deck will affect flow numbers.
 
 
 
 
 
 
 

Sales/Tech Line: (603) 378-0090
Email:
tech@FlatlanderRacing.com

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*All prices on this site are subject to change without notice. Flatlander Racing™ disclaims responsibility for any printing or typographical errors, and does not guarantee that all information is accurate.


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