Casting #	CID	Years	Intake	Exhaust	Chamber	CC	Additional Comments
6399	307	62-63
330545	350	73					76cc - 2.02"/1.6" valves - Corvette & Camaro
330862	400	70-73					1.94"/1.5" valves
333881	350	74-75					76cc - 2.02"/1.6" valves - Corvette & Camaro
333882	350	74-80					76cc
333882	400	74-80					76cc
340292		70's					Service replacement head, 64cc
354434	262/267/305	75-79
358741	305	76-79
376445	305,350	80-84
376450	262,305,350	74-81					7 bolt exhaust bolt holes - 168/60 cc port volumes
376455	350	77-85
376495	350	70-79
378450	305	78-85
458642	350,400	67-70
462624	350,400	75-86					7 bolt exhaust bolt holes
468642	350,400	76-up
471513	267,350	79
517513	267,350	79
3636839	265	55
3703523	265	55					Corvette
3713358	265	55-56
3713569	265	55-56
3725306	265	55-57
3731539	283	57					Corvette w/Rochester mechanical FI
3731544	283	57-61
3731554	283	57-62
3731556	283	57
3731762	265	56					Corvette 2X4
3737775	283,327	62-67
3740997	283	57
3743056	283	58
3743096	327	62-67					GMC truck
3747363	283,327	57-61
3747460	283/327	59-67
3748770	283	58					Corvette 1X4, 2X4, & FI
3748772	283	58-61
3755537	283	57-62
3755539	283	58-62
3755549	283	57-62
3755550	283	59					Corvette
3755585	327	62-67					GMC truck
3767450	305	76-79					7 bolt exhaust
3767460	283	64-67					HD truck only
3767462	327	62-67
3767465	283	59-61
3767754	283	59-61					283 Power Pack
3767792	283	60-64
3770126	327	69
3774682	283,327	60-64
3774684	327	62-64
3774692	283	58-64					60-61 Corvette, 283 Power Pack
3782461	327	64-66					"Camel Hump" head, 161/62cc port volumes
3782461X		60-63					"Camel Hump" head, 172/64cc port volumes
3795896	283,327	63-65					62-64 327/350hp Corvette, 283 Power Pack
3798996	327	63-67
3814480	283,327	60-67
3814482	327,350	62-67					low compression head, 75cc
3817680	283,327	63-67
3817681	327,350	62-67
3817682	283	61-62
3836839	265	55
3836842	283,327	57-67
3837064	265,283	56-62
3837065	265	55-56					GMC truck
3847820	283	57-58
3876775	283,327	60-67					Camaro, 327/210hp
3884520	283,327	66-67					60cc, GM & Studebaker, some Canadian built
3890462	302,327,350	66-67					"Camel Hump" head - 161/65cc port volumes
3901068	350	87-up					Goodwrench crate engine, 350/285hp, 64cc, 72° bolt angle
3911032	307,327	68
3912264	283	58-62
3912265	283	63-64
3912311	327	67
3912313	327	65-67
3917290	307,327	67-68
3917291	302,327,350	67-68					"Camel Hump" head, 161/65cc port volumes
3917292	327	68					"Camel Hump" head, Corvette 327/350hp
3917293	307,327	68					75cc
3927185	307,327	69-70					69cc
3927186	302-350	69-70					"Camel Hump" head, 63cc
3927187	350	69-70					"Camel Hump" head
3927188	307	69-70					74cc
3928455	302,327	68
3928494	327,350	68
3928495	327	68
3931633	307	68-73
3931635	350	68-76
3931637	327	68-69
3931638	327	68					GMC truck
3932441	350	69-70					76cc, 161/65cc port volumes
3932441X	350,400	69-70					350- 80cc, 1.94"/1.5" valves; 400- 1.94"/1.6" valves; 165/65cc port volumes
3932454	307	69
3946812	350	69
3946813	350	69-70
3947040	327	68					64cc, GMC truck, no accessory holes, "right angle" casting
3947041	302,350	69-70					64cc, w/accessory holes, "right angle" casting
3951598	400	70					76cc
3964286	350
3965742	350	70					Service head
3970126	327,350	67-70
3973370	350	69-70					Service head, straight or angle plug, 1.940" x 1.500" Valves, 67CC
3973414	350	70					"Camel Hump" head, LT1, 64cc
3973487	350	71-76					71-72 LT1, 75cc, 161/65cc port volumes
3973487X	350	71-72					75cc, larger intake ports
3973493	400	71					76cc
3986316	350	71					Corvette, 76cc
3986336X	350						76cc
3986388	307,350	68-76
3986339	307,350	71					74.5cc
3986339X	307,350	71					74.5cc
3991492	350	70					"Camel Hump" head, LT1, 64cc, straight plug
3991492		71-up					Replacement head, 64cc, straight or angle plug
3998916	350	72					LT1, 76cc, screw in studs, large valves
3998920	350	72-73
3998991	307,350	72-73					74.5cc, hardened seats in 73
33998993	307,350	72-73					74.5cc, hardened seats in 73, 159/64cc port volumes
3998993	350						Goodwrench crate engine, Mexican made
3998997	350,400	72-73					76cc, hardened seats in 73
3998997	305,350	78-84					161/65cc port volumes
4079261	350	75
10033687							Pontiac aluminum race head, 62cc, angle plug, 196cc ports, 2.10"/1.625" valves, 23° bolt angle
10045434							Aluminum head, 55cc, angle plug, raised runner design
10051101							Bowtie aluminum head, 55cc, raised runner design, angle plug, 196cc port volume
10088113	350	88-up					Corvette, raised runner D port exhaust, 58cc, angle plug, 1.94"/1.5" valves
10093328							Pontiac aluminum head, 15°, 224/61cc volumes
10106178	350	90					Corvette ZR1 LT5, DOHC 32V passenger side
10106179	350	90					Corvette ZR1 LT5, DOHC 32V driver side
10110810	350	93-up
10125320	350	94-96					Gen II 350, LT1, cast iron, reverse flow cooling, Impala SS, & 9C1Police Pkg.
10128374	350	92-up					Gen II 350, LT1, aluminum, 53cc, angle plug, reverse flow cooling, 175/68cc port volume
10134352							Bowtie low port aluminum head, 45cc, angle plug, 223cc port volume, 18°
10134363							Bowtie high port aluminum head, 45cc, angle plug, 210cc port volume, 18°
10134363							Bowtie high port aluminum head, 50cc, angle plug, 250cc port volume, 18°, CNC machined, 2.15"/1.625" valves
10134363							Bowtie high port aluminum head, 60cc, angle plug, 215cc port volume, 18°
10134363							Bowtie high port aluminum head, 65cc, angle plug, 18°
10134363							Bowtie high port aluminum head, 35-37cc, 223cc port volume
10147898	350	95-96					Goodwrench crate engine
10174389	350	91-94					Corvette ZR1 LT5, DOHC 32V driver side
10174390	350	91-95					Corvette ZR1 LT5, DOHC 32V passenger side
10185040							Aluminum head, 1st version, 45cc, angle plug, splayed valve, 263cc port volume
10185040							Aluminum head, 2nd version, 45cc, angle plug, splayed valve, 240cc port volume
10205245	350	93					Gen II 350, LT1, aluminum head, reverse flow cooling, 175/68cc port volume
10207643	350	94-96					Gen II 350, LT1, aluminum head, reverse flow cooling
10225121	350	94-95					Corvette ZR1 LT5, DOHC 32V driver side
10225122	350	94-95					Corvette ZR1 LT5, DOHC 32V passenger side
10239902	350	96-up					Gen II 350, aluminum head, reverse flow cooling
10239906	350	96-up					Vortec 5700, L31, 64cc, 1.94"/1.5" valves, 170cc port volume
102480011	SB2	97-up					SB2 2nd version, mirror port, revised plug location & valve angles
12552520	305	96					Vortec 5000 truck
12554290	350	94-96					Gen II 350, LT1, cast iron, reverse flow cooling, Impala SS & 9C1 Police Pkg.
12558062	350	98					Vortec 5700
14096217	350	55-86					350/300hp crate engine, 64cc, 90° intake bolt angle
14010201	305	84
14011034							Bowtie Phase 2 iron head, 64cc, angle plugs, 184cc port volume, 2.02"/1.6" valves
14011049							Bowtie Phase 6 aluminum head, 55cc, angle plug, 180cc ports, 2.02"/1.6" or 2.10"/1.65" valves
14011083	350	55-86					350/300hp crate engine, 64cc, 90° intake bolt angle
14014415	267,305	80-85
14014416	305	80-85					305HO, 58cc, 1.84"/1.5" valves, 7 bolt exhaust
14014440	305	80					305HO, 58cc, 1.84"/1.5" valves
14020517	350	80
14020555	305	81
14020556	350	80-81
14022056	350	81-85
14022301	305	78-79
14022601	267,305	80-85					305HO, 58cc, 1.84"/1.5" valves, 7 bolt exhaust
14022801	305	80-85
14071114	350	80-85
14079261	350	86
14085963	350	85-86
14089119	350	87-88
14094093	350	80-87
14096217	350	87-up					350/285hp crate engine, 64cc, 1.94"/1.5" valves, 72° intake bolt angle
14101081	305	87-91
14101083	350						350/285hp or 300hp crate engine, 64cc, 1.94"/1.5" valves, 90° or 72° intake bolt angle
14101128	350	86-87					Corvette aluminum head, 58cc, angle plug
14102187	305	87-91					305HO, 1.85"/1.5" valves, 58cc, 7 bolt exhaust
14102191	305,350	87-up					7 bolt exhaust
14102193	305,350	87-up					7 bolt exhaust
14022301	305	80-84
14022601	267,305	79-85
14022801	305	80-86
24502559	SB2	96-up					Bowtie SB2 aluminum 1st design, mirror port
33417369	350	90-up					Gen I Goodwrench, Mexican, 76cc, 1.94"/1.5" valves, 7 bolt exhaust, perimeter valve cover bolts, "heavy" casting
38998997	400	70-80
Casting #	CID	Years	Intake	Exhaust	Chamber	CC	Additional Comments
330864	396, 402, 366T, 427T, 454 Truck	68-84	2.06	1.72	Open
330865	396, 402, 366T, 427T, 454 Truck	68-76	2.06	1.72	Open
330866	366T, 427	68-78			Open
330867	427	69-73			Open
336765	427T	68-78	2.06	1.72	Open
336768	427T	73-76			Open
336781	454	73-84	2.06	1.72	Open	118	256/114cc ports
343771	366T, 427T, 454	68-86	2.06	1.72	Open
343772	366T, 427T, 454	68-86	2.06	1.72	Open
343783	454	70-76	2.06	1.72	Open
346236	454	75-87	2.06	1.72	Open	120	225/116cc ports
348238	454	75-83	2.06	1.72	Open
352625	454	70-76			Open
353049	396, 402, 454	73-84	2.06	1.72	Open	122	255/119cc ports
366765	427T	74-78			Open
370696	396, 454	65-78			--
386781	454	73-79			Open
473328	366T	68-89	2.06	1.72	Open
3846206	396	65-70			Closed	97
3856206	396, 402, 427T, 454, 366T	65-83	2.06	1.72	Closed	97
3856213	366T, 427T	65-82	2.06	1.72	Closed
3856260	396	68			Closed
3872702	396 & 427	65-66	2.06	1.72	Closed	98
3876875	427T	77-85	2.06	1.72	Open
3904390	396 & 427	65-67	2.06	1.72	Closed	98
3904393	366T	68-76	2.06	1.72	Open
3908952	427	67			Open		"M.Truck", Marine
3909802	396 & 427	65-67	2.06	1.72	Closed	101
3917215	396 & 427	65-69	2.06	1.72	Closed	101
3917219	366T, 396, 427T	66-76	2.06	1.72	Closed
3931063	396 & 427	65-72	2.06	1.72	Closed	101
3933148	69 396/265hp, 366T, 396, 427T	69-76	2.06	1.72	Closed	112
3933149	427T	68-76	2.06	1.72	Open	122
3935401	427T	67-76			Open
3937734	396	69			Open
3964280	427 & 454	66-70	2.06	1.72	Closed
3964290	396, 402, 427, 454	69-76	2.06	1.72	Closed	101	454 Big Oval Port
3965198	396 & 402	68-72	2.06	1.72	Closed
3969854	396 & 402	68-72			Closed
3973195	402	71-76			Open
3975950	366T, 396, 402, 427T	69-77	2.06	1.72	Open
3986133	366T & 454	68-84	2.06	1.72	Open
3986135	366T & 427T	69-73			Closed
3986136	396, 402, 427, 454	68-84	2.06	1.72	Open
3993820	402 & 454	68-84	2.06	1.72	Open	113	, 113cc chamber, 255/114 ports, 454 Passenger and Trucks
3999241	402 & 454	70-73	2.06	1.72	Open	113
6272290	402, 427, 454	72-73	2.06	1.72	Open
6272292	402 & 454	70-78			Open
10052902	427T Mk IV	96-			Open
10101136	454	91-94	2.06	1.72	Open
10101140	366T, 427T Gen V	91-			Closed
10114156	Gen.V & VI 454	96-			Open	118
10121033	454	78-88	2.06	1.72	Open
10141279		96-			Closed	100	"Vortec 7400"
10487052	366T	77-90			Open
12352783	454	79-93	2.06	1.72	Open
12363391		96-			Open	110	Bowtie, Aluminum, Signature Series, fits MKIV, Gen.V, Gen.VI,
12558162	496	01-			Closed		Gen.VII,"Vortec 8100", 8.1L, truck
12560241		98-			Closed	100	"Vortec 7400"
12562932		91-95			Open	118	Gen.V, truck crate motor
14025175	454	83-93	2.06	1.72	Open
14081044	454	86-90	2.06	1.72	Open
14081045	454	78-87			Open
14081052	366T, 427T, 454	85-87			Open
14092359	366T & 427T Hi Perf	86-90	2.06	1.72	Open
14092360	454	78-90	2.06	1.72	Open		Truck
14101398	454	86-90	2.06	1.72	Open
*1 T = Tall Deck Block
Casting #	CID	Years	Intake	Exhaust	Chamber	CC	Additional Comments
3804391	396 - 375 and 425HP	65			Closed
3830817	409	65	2.06	1.72	Closed
3852583	409	63-65	2.19	1.72	Closed
3856208	396/425hp / 396/375hp	65-67	2.19	1.72	Closed	109	"Z-16" Chevelle
3873858	396 & 427 Hi Perf	65-66	2.19	1.72 or 1.88	Closed	109
3904391	396 & 427 Hi Perf	65-67	2.19	1.72 or 1.88	Closed	107
3904392	Aluminum 427 - 430 & 435 HP	67	2.19	1.72	Closed	107
3919328	Aluminum 427 - 425 & 435 HP	67			Closed
3919391	427 / 425 HP	66			Closed
3919838	Aluminum 427 L-88 & L-89	67-69			Closed
3919839	396 & 427 Hi Perf	67-69			Closed
3919840	396 & 427 Hi Perf	65-69	2.19	1.72 or 1.88	Closed	107
3919842	396 & 427 Aluminum L-88	67-69	2.19	1.88 or 1.84	Closed	107
3931068	427 Hi Perf	66-69			Closed
3946074	69 427 L88, ZL1, Aluminum & 71 454 LS6	69-71	2.19	1.88	Open	118
3964291	396, 402, 427, 454	69-70	2.19	1.88	Closed	109
3964292	454 / 450 HP	70	2.19	1.88	Closed
3994025	454	71	2.19	1.88	Open
3994026	454 LS-6 - 425 HP,	71	2.19	1.88	Open	118
3996074	454	71			Open
6258723	454 / 425 HP	71	2.19	1.88	Open
6272990	454	70-76	2.19	1.88	Open	118	service replacement, used on some MKIV crate engines
10045427		90-			Open	91	Pontiac/Chevy Aluminum, Large Port, race
10049875		90-			Open		Pontiac/Chevy Aluminum Small port, race
10051128		88	2.19	1.88	Open	72	Bowtie, Aluminum, Symmetrical ports
10051129		88			Open		Bowtie, Aluminum "raw" casting, Symmetrical port
12363401		96-			Open	118	Bowtie, Aluminum, Signature Series, fits MKIV, Gen.V, Gen.VI
12363861		96-			Open		Signatures Series, 2ND Design, Raised Port, Aluminum
12562934	Gen.VI 502 Marine	00-			Open
14011077	427 & 454 Solid	69-71	2.19	1.88	Open		Aluminum, fits MKIV, "C-port" 118cc chamber, also sold as a "solid" head
14044861		84-96	2.19	1.88	Open	105	Bowtie, Aluminum, MkIV, "raised runners", 1st design
14044861		96-	2.19	1.88		115	Bowtie, Aluminum, Signature Series, fits MKIV, Gen.V, Gen.VI "raised runners", 2nd design
14044861		84-96	2.19	1.88			Bowtie, Aluminum, MkIV "raw" casting of "861" MKIV 1st design
14044862		84					Aluminum Bowtie Raised Ports, 1ST Design
14096188		70-71	2.19	1.88	Open	116	54 service replacement, also used on later Mark IV LS-6, LS-7 and 454 HO crate motors
14097088	454HO & 502HO Gen V	91-	2.19	1.88	Open	118
24502585		97					Olds/Chevy, DRCE 2, Pro Stock aluminum, for blocks w/4.900" bore centers