technical specs

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Here at AFD, we try and provide as much information as possible to you, so your decision is made easier, we have listed part numbers and brands of components that may be of interest to you when planning your next engine build. There are many other brands and part numbers that also can be used, there are just way too many for us to list here.

For both the 2V and SP4V series cylinder heads, most technical specs will be the same, the obvious will differ (eg. runner volumes/ available valve sizes)

It is vital to have the correct component selection for your application, please contact AFD for assistance should you be not 100% sure, the wrong components for a particular application can damage your engine or not allow the engine to show it's full potential.The parts listed below are a few common components widely used and easily accessible.

NOTE:Our products are not designed to accept a 3/8 pushrod,5/16 pushrods are more than good enough in 99% of cases,
extra clearancing to suit 3/8 pushrods can be done at your own risk.

Material	A601 (356) Heat treated to T6 specs
Chamber Volume Options: please specify your chamber choice when ordering,failure to do so will result in the standard option being supplied. custom larger chambers are available at additional cost.	48cc 54cc 57cc 60cc 64cc -standard option 67cc
Runner Volumes: volumes may vary due to casting clean up proceedures at the time of manufacture.allow 2%	2V Intake 200cc/ Exhaust 130cc SP4VS Intake 220cc/ Exhaust 130cc SP4VR Intake 245cc/Exhaust 130cc
Valve Guides	Manganese Bronze by C.H.E (USA)
Valve Guide Angles	Intake 10 x 4 degrees Exhaust 9.5 x 3.0 degrees
Rocker Studs	7/16 unc screw in studs Comp Cams P/N 4512-16 ARP P/N 200-7101 (Pro Series) ARP P/N 100-7101 (High Performance)
Head Studs/Bolts (Standard cleveland length)	Studs ARP 154-4004 (hex) 154-4204 (12 point) Bolts ARP 154-3604 (hex) 254-3704 (12 point) Follow manufactures torque specs
Spark Plugs	DO NOT use factory OEM cleveland spark plugs 5/8 hex,long reach,washer seat only NGK BCP 6ES or Champion C59C or equivelant (Required Heat range may vary)
Valve Seat Inserts All inserts are C.H.E products	Intake 2.250" x 1.900" x .375" Ductile Iron Exhaust 1.750" x 1.470" x .375" Ductile iron unleaded fuel friendly
Valve Size Options	2V:Intake: 2.100" /2.125"/ 2.150" / 2.190" Exhaust:1.650" / 1.710" SP4V series: 2.190" (not all valve sizes apply to all AFD cylinder heads)
Valve Stem Seals	.530" o.d x 11/32" Comp Cams 503-16
Spring Height	1.960" with Comp 741-16 and 611-16 retainer/locks
Spring Locators	1.540" o.d x .570" i.d Comp Cams 4772-16 / 4771-16,check spring compatability. Manley 42317-16
Head Gaskets	Cleveland: Cometic C5871-040 Windsor/Boss felpro P/N 1046 we do not reccomend felpro 1013 gaskets with our heads,they have the wrong valve relief pockets in them.
Accessories	Standard Cleveland accessary holes in ends of heads for power steering/alternater or A/C
Roller Rockers NOTE:Some brand rockers may supply BB chev rockers that share the same RR,the RR is made up differently on a true cleveland rocker arm,the BB chev version may over shoot the contact area of the valve and result in a much shorter pushrod on the intake side.	Comp Cams 1045-16 1.73:1 RR Comp Cams 4603-16 Yella Terra Platnium Race Rockers # 6321 Street Terra Rockers # 2003 T& D Rockers Jessel
Guide Plates: NOTE: adjust guide plate position to achieve correct rocker alignment Depending on brand,cutting and reconnecting may be required as these items may and do vary greatly from brand to brand	Manley 42163 - 5/16 pushrods Note;Some guide plates have been having alignment issues.In the case of this happening,cutting the guide plate,aligning it and then re welding back together can be done .we cannot accept resposibility for other companies product fittness.
Recommended Valve Springs (check with camshaft grinder for your actual spring requirements.)	See camshaft specs for correct tensions
Retainers	Manley 23635-16 with 13194-16 locks Comp Cams 741-16 with 611-16 locks
Locks	Comp Cams 601-16 (hardened steel 7 deg) 648-16(machined steel 7 deg) 611-16(machined 10 degree jumbo lock)
Lash Caps	Comp Cams 621-16
Valve Cover Bolt/Stud Kits	ARP stud kit 200-7620 Bolt Kits hex 100-7504,12 point 100-7508
Header bolt kit	ARP hex 100-1102 12 point 100-1202
Intake Manifold Bolt Kit NOTE:bolt length will vary depending on manifold thickness.	ARP hex 154-2004 12 point 154-2104 (check manifold bolt length requirements first)
Cylinder Head Fitting Notes	Setting rocker/pushrod length:In some cases BBC rockers are supplied, Cleveland and BBC rockers share the same ratio of 1.73:1,but they are made up differently. BBC chevy rockers have a longer nose length and may over shoot the centre of the valve, this generally shows up on the intake side more commonly than the exhaust due to the complex compounding angles of the intake guide/rocker layout.different length pushrods may be required for intake and exhaust.
Torque settings	Follow all normal Cleveland torque setting recommended by the gasket manufacturers.
Intake Manifold Fitment	Due to the many different makes and models of intake manifolds available today for the Cleveland/ Boss engines, some manifolds may end up with an increased gap between the base of the manifold and the top of the engine block.The smaller the chamber, the more the manifold gets pushed up the V of the engine, resulting in a larger gap and or a port/bolt hole mismatch.Machining of the intake faces of the manifold or cylinder heads will rectify this issue. In the case of small combustion chambered cylinder heads where material has been removed from the cylinder surface to achieve the smaller chambers, cutting the intake face of the cylinder head instead of the manifold is advise.