AirFlow Research Heads for the Big Block Chevy

 

305 cc Rectangle Port Magnum  $1950

The smallest intake volume runners in our line-up, but don’t let size fool you. Our 305cc “As Cast” or fully CNC ported 315cc cylinder heads will provide you with flow numbers most medium sized heads, and some larger, can only dream about. This line was designed to optimize low and mid-lift airflow, while still generating impressive peak figures. Their application should be focused on smaller cubic inch Big Blocks (396-502), with a primary operating range of 2500-6800 rpm’s (this range is an average and will vary with engine displacement as well as component selection). These heads should also be given strong consideration in larger street driven or marine applications up to 555 CID, where low rpm power and drivability are a factor. The 315 version is extremely versatile with its incredibly strong low and midlift airflow figures as well as peak numbers approaching the 400 CFM mark. Either one of these two cylinder heads would be a great choice if your looking for big torque, strong low rpm performance, and still have good rpm capabilities. Both the 305cc and the 315cc come standard with AFR’s trademark .750” thick head deck, reinforced rocker stud bosses, and are equipped with premium one piece stainless steel 2.250” intake valves and 1.880” exhaust valves. Standard combustion chamber volume is 119 cc’s on the 305 “As Cast” pieces, while our fully CNC ported 315cc version comes with a 121cc chamber. Both are available with an optional 114cc combustion chamber as well. Properly selecting the correct cylinder head for an application depends on a large number of variables. Please consult with one of our sales technicians to help assist you in making the best decision for your particular application. Note: Optional stud girdle required for 2° rolled valve angles and 1” longer head bolts needed on four bottom exhaust bolt holes.

Description	Part Number
305cc As Cast w/o Parts, 119cc	3050
305cc As Cast w/ Parts, 119cc	2100
305cc As Cast w/o Parts CNC Chambers, 121cc	3050-1
305cc As Cast w/ Parts CNC Chambers, 121cc	2100-1add $290

 

 

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 315cc Fully CNC Ported Magnum BBC Head $2870

 

Description	Part Number
315cc Fully CNC Ported w/o Parts, 121cc	3150
315cc Fully CNC Ported w/ Parts, 121cc	2000

 

 

325cc As Cast Magnum BBC Head $2870

Are you looking for big torque and big horsepower number? Our BB Chevy line of medium volume intake runners will provide you with exactly that. The phrase “ having your cake and eating it to” would certainly be appropriate with their moderately sized intake runners producing tremendous flow figures across the entire lift range (Our CNC 335 flows 410 CFM!). These high flow/high velocity ports provide extreme versatility and fill the needs of many applications. From a max-effort high compression 454 to a 605 CID low rpm marine application, either one of these cylinder heads would be a great choice. These heads would also be ideal in a larger cubic inch “ Pro-Street” application with their broad torque range, as well as significant rpm and horsepower capability. These cylinder heads will work best with a primary operating range of 3000-7000 rpm’s (This range is an average and will vary with engine displacement as well as component selection). Both the 325cc and the 335cc 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 our 325 “As Cast” pieces, while the fully CNC ported 335 version comes with a 121cc chamber. Both are available with an optional 114cc combustion chamber as well. Properly selecting the correct cylinder head for an application 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.

Description	Part Number
325cc As Cast w/o Parts, 119cc	3250
325cc As Cast w/ Parts, 119cc	2101
325cc As Cast w/o Parts CNC Chambers, 121cc	3250-1
325cc As Cast w/ Parts CNC Chambers, 121cc	2101-1

  

335cc Fully CNC Ported Magnum BBC Head $2950

 

335cc Fully CNC Ported w/o Parts, 121cc	3350
335cc Fully CNC Ported w/ Parts, 121cc	2001

 

 

Description	Part Number
345cc As Cast w/o Parts, 119cc	3450
345cc As Cast w/ Parts, 119cc	2110
345cc As Cast w/o Parts CNC Chambers, 121cc	3250-1

 

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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. 

345cc As Cast Magnum BBC Head  $1950

Description	Part Number
345cc As Cast w/o Parts, 119cc	3450
345cc As Cast w/ Parts, 119cc	2110
345cc As Cast w/o Parts CNC Chambers, 121cc	3250-1
345cc As Cast w/ Parts CNC Chambers, 121cc	2110-1

  

357cc Fully CNC Ported Magnum BBC Head $2950

 

Description	Part Number
357cc Fully CNC Ported w/o Parts, 121cc	3570
357cc Fully CNC Ported w/ Parts, 121cc	2010