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AFR
305cc As Cast Magnum BBC Head
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AFR’s Torque Monster
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305cc BBC
as cast Aluminum Cylinder Head Flow Chart
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 The smallest intake volume runners in our
line-up, but don’t let size fool you. Our
305cc “As Cast” with CNC bowl blend or fully
CNC ported 315cc aluminum 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 aluminum 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. (see footnotes here)
Note:
Optional stud
girdle required for 2° rolled valve angles
and 1” longer head bolts needed on four
bottom exhaust bolt holes. |
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305cc BBC
CNC Chamber Aluminum Cylinder Head Flow
Chart
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305cc As Cast BBC
Cylinder Head Part Numbers
Pairs
of Heads Complete With Parts or Ready to Install
Competition Package Ported Aluminum Heads
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Description
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Part
Number
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| 305cc As Cast w/o Parts, w/ CNC bowl blend 119cc |
3050 |
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305cc As
Cast w/ Parts, w/ CNC bowl blend 119cc |
2100 |
| 305cc As Cast w/o Parts, w/ CNC Chambers & CNC bowl
blend 121cc |
3050-1 |
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305cc As
Cast w/ Parts CNC Chambers, w/ CNC bowl
blend 121cc |
2100-1 |
| Basic
Package Components |
Part # |
| Competition 5 angle
valve job |
|
| Intake Valve, 2.250" stainless steel |
AFR #7620 |
| Exhaust Valve, 1.880"
stainless steel |
AFR #7630 |
1.625 O.D. Roller Dual Valve Spring with dampener,
255 lbs. on seat, .750" maximum lift |
AFR #8031 |
| 10° Chrome Moly
Retainer |
AFR #8511 |
| 10° Valve Locks |
AFR #9005 |
| Guide Plates
|
AFR #6109 |
| Valve Seals |
AFR #6611 |
| Hardened Shims |
AFR #8046 |
| Intake Valve Seats |
AFR #9062 |
| Exhaust Valve Seats
|
AFR #9064 |
| Bronze Valve Guides Intake |
AFR #9045 |
| Bronze Valve Guides
Exhaust |
AFR #9046 |
| AFR BB Chevy 7/16 Exhaust Studs |
AFR #6406 |
| AFR BB Chevy 7/16
Intake Studs |
AFR #6407 |
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Specifications, Features, and Optional
Supporting Components |
| Head Torque |
75 ft lbs. |
| Intake Port Gasket, 1.720" x 2.450" with 1/2" radius
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AFR #6855 or
Fel-Pro #1211 |
| Exhaust Port Gasket |
AFR #6858 |
| Exhaust Vavle Size 1.880 |
AFR #7630 |
| Head Gasket |
4.540 bore, Fel Pro
#1017, AFR #6850 |
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Mark V-VI-up to 4.500
Bore Fel-Pro #17048 or #1047 |
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Mark V-VI-4.500 to
4.600 Bore Fel-Pro #17049 |
| Head Bolts and Studs |
Standard ARP
AFR #6308, #6307, & #6306 |
| Head Bolt Washers |
Manley, AFR #6320 |
| Stud Girdle |
AFR #6210 |
| Suggested Manifold |
Edelbrock #2907 &
#2927, AFR #5500 #5202 |
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Dart #6200, #6201,
#6202, & #6203 |
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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 |
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| Valve Spacing |
Standard |
| Rocker Arms |
Standard |
| Valve Angle |
24°/4° Intake, 15°/4°
Exhaust |
| Angle Mill (milling options available), 102 cc Maximum |
.009" per cc |
| Flat Mill (milling
options available), 114cc Maximum |
.006" per cc |
Important:
Do not port match your intake manifold to Fel-Pro
gasket as it does not precisely fit AFR heads.
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