* To purchase individually, substitute -1 for the -8 suffix in part number.
Severe-Duty Valves Severe-duty exhaust valves are made of XH-428 stainless steel which has double the tensile strength of imported valves at 1500°F. Nk-844 stainless steel intake valves have a fatigue strength 1000 times greater than imported valves. Sold in sets of 8. Part No. Type Size Stem Installed Height Small Block Chevrolet 262-400 MAN11567-8* Exhaust 1.500" .3415" Stock MAN11543-8* Exhaust 1.600" .3415" Stock MAN11595-8 † Exhaust 1.600" .3415" Stock MAN11539-8 # Exhaust 1.600" .3415" .100" Longer MAN11869-8 Exhaust 1.600" .3415" .100" Longer MAN11749-8 S Exhaust 1.600" .3415" .100" Longer MAN11865-8 S Exhaust 1.600" .3415" .200" Longer MAN11751-8 S Exhaust 1.600" .3415" .200" Longer MAN11755-8 S Exhaust 1.600" .3415" .400" Longer MAN11513-8 S Exhaust 1.600" .3415" .500" Longer MAN11763-8 S Exhaust 1.625" .3415" .600" Longer MAN11592-8 Intake 1.937" .3415" Stock MAN11886-8 Intake 1.940" .3415" .100" Longer MAN11826-8 Intake 2.020" .3415" .100" Longer MAN11846-8 Intake 2.055" .3415" .100" Longer MAN11818-8 Intake 2.080" .3415" Stock MAN11844-8 Intake 2.080" .3415" .100" Longer MAN11858-8 Intake 2.080" .3415" .200" Longer * 7° dish face and 4.911" length # Valve has 10° underhead angle. † Flat face and 4.936" length S Valve has 15° underhead angle.
Valve Locks Heat-treated, black oxide coated steel locks are available in extra-thick Super 7° or traditional 10° for conventional or bead lock valves. Sets of 8 (16 pieces) or 16 (32 pieces). Part No. Description Installed Height
Lock Style
Super 7°
MAN13050-8 MAN13051-8 MAN13052-8 MAN13060-8 MAN13061-8 MAN13062-8 MAN13080-16 MAN13081-16 MAN13083-16 MAN13084-16 Machined 7° MAN13094-16 10° MAN13096-16 MAN13097-16* MAN13150-8 MAN13151-8 MAN13152-8 MAN13160-8 MAN13161-8** MAN13162-8 MAN13170-8 MAN13194-16 MAN13195-16 MAN13198-16
5/16” Valve Locks 5/16" Valve Locks 5/16" Valve Locks 11/32” Valve Locks 11/32" Valve Locks 11/32" Valve Locks 5/16" Valve Locks 11/32" Valve Locks 11/32" Valve Locks 11/32" Valve Locks 5/16" Valve Locks 11/32" Valve Locks 5/16” Valve Locks 5/16" Valve Locks 5/16" Valve Locks 11/32" Valve Locks 11/32" Valve Locks 11/32" Valve Locks 7mm Valve Locks 11/32" Valve Locks 3/8" Valve Locks 11/32" Valve Locks 8mm Valve Locks
.050” Less Standard .050" More .050” Less .050" More Standard .050" Less Standard Standard
Bead Loc Bead Loc Bead Loc Bead Loc Bead Loc Bead Loc
Conventional Conventional Conventional
.050" More Conventional
.050” Less
GM LS/LT-1
Standard Standard .050” Less Standard .050" More .050" Less
Conventional Conventional
Bead Loc Bead Loc Bead Loc Bead Loc Bead Loc Bead Loc Bead Loc
Standard
NexTek Series Oval Track Valve Springs
.050" More
Standard Standard Standard
Conventional Conventional
Put an end to spring degradation. NexTek springs are made from specially wound, heat-treated, and ¿QLVKWUHDWHGFKURPHVLOLFRQ6SULQJ,'¶VDUHIXOO\ chamfered for retainer clearance. Sold in sets of 16.
.050" More Conventional * Not recessed to accept a wear cap. ** Lightweight Titanium material Titanium 10° Valve Locks /LJKWZHLJKWYDOYHORFNVDUHSUHFLVLRQFUDIWHGIURP durable titanium Part No. Valve Stem Installed Height Groove Type Qty. MAN13084T-16 .3415” .050” More Conventional 16 Pair MAN13151T-8 .3110" Standard Bead Loc 8 Pair MAN13161T-8 .3415" Standard Bead Loc 8 Pair MAN13194T-16 .3415" Standard Conventional 16 Pair Pushrods By Applications :H¶YHOLVWHGFRPPRQDSSOLFDWLRQVRIDQGGLDPHWHU FKURPHPRO\SXVKURGV$OOSXVKURGVDUHVWHHOKHDWWUHDWHG DQGEODFNR[LGH¿QLVKHGIRUFRUURVLRQSURWHFWLRQ6HWVRIRU
Max. Valve Lift
Seat Pressure
Open Pressure
Coil Bind
Part No.
Application Late Model, Flat Tappet
O.D./I.D.
MAN221432-16 MAN221440P-16 † MAN221441P-16 † MAN221443-16 MAN221443P-16 † MAN221444-16 MAN221445P-16 †
1.530"/.750" 1.570"/.760" 1.570"/.750" 1.560"/.812"
.630" 162@1.900" 425@1.300" 1.200" .700" 255@2.000" 629@1.300" 1.190" .730" 280@2.030" 700@1.300" 1.215" .750" 260@2.000" 660@1.250" 1.200" .730" 235@1.950" 610@1.250" 1.170" .730" 235@1.950" 610 @ 1.250" 1.170" .750" 235@2.050" 645@1.300" 1.220" .800" 280@2.050" 680@1.250" 1.200" .825" 250@2.025" 750@1.200" 1.150" .850" 290 @ 2.000" 825 @ 1.150" 1.105"
Oval Track, Roller Oval Track, Roller
MAN221442-16 Oval Track, Roller
BGN, WoO, LM 1.580"/.832" BGN, WoO, LM 1.580"/.832" BGN, WoO, LM 1.610"/.842"
Oval Track, Roller
1.620"/.852"
MAN221452SF-16* Roller, w/o Damper 1.550"/.800"
MAN221454-16
Sportsman
1.650"/.855"
* Signifies Super Finished. † Signifies polished finish.
10° Titanium Retainers 0DQOH\¶V$/9WLWDQLXP retainers have the durability needed for racing engines. Sold in sets of 16.
Part No.
Application
Length
Dia.
Dimensions
Spring Type Height
MAN25709-16 SB Chevrolet 262-400 Stock Length 7.800" MAN25787-8 SB Chevrolet 262-400 Stock Length 7.800"
5/16"
Part No.
Spring O.D.
A
B
C
D
MAN23640-16 Double +.100" 1.625"
1.500" 1.175" .850" —
3/8"
MAN23644-16 Double Std. 1.500" 1.140" .740" — MAN23648-16 Double +.100" 1.580"/1.610" 1.500" 1.150" .825" — MAN23650-16 Double +.100" 1.550" 1.500" 1.140" .740" — MAN23654-16 Double Std. 1.625" 1.500" 1.175" .765" — MAN23655-16 Double +.100" 1.625" 1.500" 1.175" .765" — MAN23658-16 Double Std. 1.550" 1.500" 1.105" .710" — MAN23660-16 Double +.100" 1.550" 1.500" 1.105" .710" — MAN23661-16 Double +.100" 1.550" 1.500" 1.120" .705" — 1.550"
MAN25711-16 MAN25712-16 MAN25788-8 MAN25706-16 MAN25744-16
SB Chevrolet 262-400 +.050" SB Chevrolet 262-400 +.100" SB Chevrolet 262-400 +.100" SB Ford 351C Stock Length
7.850" 7.900" 7.900" 8.400" 8.150"
5/16" 5/16"
3/8"
5/16" 5/16"
SB Ford 351W
513
2019-20 CIRCLE TRACK PARTS AND ACCESSORIES
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