Tillbaka
 
CHEVY SMALLBLOCK HEADS CASTING NUMBERS

CASTING#YEARSIZECHAMBER. NOTES
3305457335076cc chamber, 2.02/1.60
33388174-7535076cc chamber, 2.02/1.60
33388274-80350/40076cc chambers
34029270'sOver the counter,
angle plug
64cc chamber
35443475-79262/267/30560cc chambers
35874176-79305 
37644577-8535076cc chamber, small valves
37645075-81262/267/30560cc chamber, 6 or 7 exhaust bolt holes
46261477-7930560cc chamber
46262475-86350/40076cc chamber,
1.72/1.5, 1.94/1.5 or 2.02/1.6 valves
45864275-84350 
46864276-up350/400 
47151379267/350 
51751379267/350 
181688763283Made in "Canada", GMC HD truck
363683955265 
370352355265 
371335855-56265 
371356955-56265 
372530656265 
373153957283283 HP FI
373154457-61283 
373155457-62283 
373155657283Truck, Made in Canada
373176256265Vette, 2x4 carbs
373777562-67283/327 
3740997572831x4, 2x4 & FI (exc.-283hp)
374305658283 
374309662-67327GMC Truck
374736357-61283 
374746059-67283/32770cc chambers
374877058283 
374877258-61283 
375553757-62283 
375553958-62283 
375554957-62283 
375555059283 
375558562-67327GMC Truck
376746059-60283 
376746262-67327 
376746559-61283 
376775459-6128360cc chambers
376779260-64283 
377468260-64283/32770cc chambers
377468462-6432775cc chambers
377469258-6428360cc chambers
378246164-66327 62cc chamber
Camel hump,no accessory holes,
160/62cc port volumes,
3782461X60-63283/327 62cc chamber
Camel hump, no accessory holes,
larger 172/64cc port volumes,
379589663-6528360cc chamber
379589662-6432760cc chamber
379899663-67327 
381448060-67283/32770cc chambers, 1.72/1.5 valves
381448262-67283/327/35075cc chambers
381768063-67283/327 
381768162-67327 
381768261-62283 
383683955265 
383684257-67283/327 
383706456-62265/283 
383706555-56265Truck
384872057-58283 
387677560-67283/32775cc chamber
388452060-67283 60cc chamber,
Some marked "Made in Canada",
also used by Studebaker
388452062-67327 60cc chamber,
Some marked "Made in Canada",
also used by Studebaker
389046266-67302/327/350 64cc chamber
Camel hump,no accessory holes,
390106887-up35064cc chamber, Crate motor, 285hp,
391103268307/32770cc chamber
391226458-62283 
391226563-64283 
391231165-67327 
391231365-67327 
391729067-68307/327 
391729167-68302/327/350 64cc chamber
Camel hump,no accessory holes,
391729268327/35064cc chamber, Camel hump
391729368307/32775cc chambers
392718569-76307/327/35070cc chambers
392718669-70302/35064cc chambers, Camel hump, accessory holes
392718769-7035064cc chambers, Camel hump, accessory holes
39271886932774cc chambers
39271887030774cc chambers
393163368-73307 
393163568-76350 
393163868327Truck
393244169-7035076cc chambers
3932441X69-70350/40080cc chambers
393245469-73307 
393245469-79350Truck
394681269350 
394681369-79350Truck
394704068327 64cc chambers,
"Right angle" casting identifier,
good HP head, no accessory holes,
used in trucks
394704169-70302/350 64cc chamber,
"Right angle" casting identifier,
good HP head, accessory holes
3947041X69-70302/350 64cc chamber,
"Right angle" casting identifier,
good HP head, accessory holes
165cc intake port
39515987040076cc chambers
3964286350  
396574270350over the counter, angle plug
397012667-71327/350 
397337069-7035064cc, over the counter, straight or angle plug
39734147035064cc chamber, LT1-370hp, Camel hump
397348771-7235075cc chamber, used on 71-72 350 LT1
3973487X71-7235075cc chamber
397349371-7240076cc chamber
39863167135076cc chamber
39863367135076cc chamber
3986336X7135076cc chamber
398633971307/35074cc chamber
3986339X71307/35074cc chamber
398638868-76307/350 
399149270350 64cc chambers, LT1,Camel hump
accessory holes, straight plug
399149270-up  64cc chambers, over the counter
Camel hump, straight or angle plug
399891672350 76cc chambers, also used w/'72 350 LT1
big valves, screw in studs
399892072-73350 
399899172-73307/35075cc chambers
399899372-73307/35075cc chambers
3998993current350 75cc chambers, Goodwrench crate motors
"Hecho en Mexico"
399899772-73350/40076cc chambers
399899778-84305/35076cc chambers
407926175350 
10033867   62cc, angle plug, 196cc intake port
Aluminum,over the counter Pontiac 23' head,
10045434   55cc, Over the counter Pontiac 15' head angle
plug, raised runner aluminum, "roll over" head
10051101   55cc, Bowtie, aluminum,
angle plug raised runner, 196cc intake port
1006520287-95350Truck
1006520387-95350Truck
1006520487-95350 
1006520587-95305 
1006520687-95350 
1006520787-95305 
1008811388-up350 58cc, Aluminum, angle plug,
raised "D" port exhaust, 1.94"/1.5" valves
10093328   61cc, Over the counter,
Pontiac 15' head aluminum, 224cc ports,
"roll over" head
1010617890350LT5, ZR1, DOHC, 32-valve,
pass. side, aluminum
1010617990350LT5, ZR1, DOHC, 32-valve,
drvs. side, aluminum
1011081091-up350Gen. 1
1012092887-95350 
1012532094-96350 Gen.II LT1, cast iron version,
used on "9C1" Police package, Impala SS,
Cadillac Fleetwood,
Buick Roadmaster reverse flow cooling
1012837492-up350 53cc, Gen.II LT1, angle plug, aluminum,
reverse flow cooling, 175/68cc ports
10134352   45cc, Bowtie, angle plug, "low" port, 223cc intake port, aluminum, 18' race head
10134363   NOTE: This casting # has been used in many
different versions of this aluminum 18' and 15'
Bowtie race head.
Different chamber volumes, port volumes,
port locations, valve sizes, etc. were used.
Check this casting carefully to determine
which features it may have.
There are at least 6 different versions
as of 11/99.
1014789895-98350Gen.I crate motor
1015955087-95350 
1015955187-95305 
1015955287-95350 
1015955387-95305 
1017438991-94350 LT5, ZR1, DOHC, 32-valve
drvs. side, aluminum
1017439091-95350 LT5, ZR1, DOHC, 32-valve
pass. side, aluminum
10185040   45cc, Bowtie, aluminum, 1st version
symmetrical ports, 263cc intake ports
splayed valves
10185040    45cc, Bowtie, aluminum, 2nd version
symmetrical ports, 240cc intake ports
splayed valves
1020524593350 Gen.II LT1, aluminum, reverse flow cooling
175/68cc port volumes
1020764394-96350 Gen.II LT1, aluminum, reverse flow cooling
175/68cc port volumes
1020889094-96265 Gen.II, L99, 4.3 Liter V-8
cast iron, reverse flow
102153399735068cc, Gen.III, LS1, aluminum
1022512194-95350 LT5, ZR1, DOHC, 32-valve
drvs. side, aluminum
1022512295350 LT5, ZR1, DOHC, 32-valve
pass. side, aluminum
1023990296-up350 54.4cc, Gen.II LT4, aluminum
reverse flow cooling, 195cc port, angle plug
1023990696-up350 64cc, "Vortec 5700", "L31"
170cc intake port, 1.94"/1.5" valves
1236771299-up  62cc chamber, "Fast Burn", aluminum
210cc intake, port, 2.00/1.55 valves
1236771399-up  62cc chamber, "Fast Burn" used on
ZZ430 crate motor, aluminum
210cc intake port 2.00/1.55 valves,
124800052000  38cc, LS1 "GTZ", aluminum
2.125"/1.625" valves, angle plug
1248001197-up  48cc, Bowtie "SB2.2", aluminum
2nd version of "SB2", "mirror ports"
revised valve angles & plug location
1250645087-95350 
1250985987-94305 
1251685287-95350 
1255156196350Gen.II, "LT1", aluminum
1255252097-up305Vortec, truck
1255429094-96350 Gen.II, "LT1", cast iron version
used on "9C1" Police package, Impala SS
Cadillac Fleetwood
Buick Roadmaster reverse flow cooling
1255569096350Gen.II, "LT4", aluminum
1255805997305Vortec, truck, 1.84"/1.5" valves
1255806298350 64cc, L31 Vortec, truck
1.94/1.5, 170cc intake port
1255880697-9835068cc, Gen.III, "LS1", aluminum
1255985399-up35068cc, Gen.III, "LS1", aluminum
1256424100-up35068cc, Gen.III, "LS1", aluminum
1256424302350Gen.III, "LS6", aluminum
1400885679-81267 
1409409386-88350 
1401020182-85305 
14011034   64cc, Bowtie, cast iron
184cc port volume, angle plug
"Phase II" head
14011049   55cc, Bowtie, aluminum
angle plug, 180cc ports, "Phase 6"
1401108355-86350 64cc, Crate motor for years indicated
285/300hp, 1.94"/1.5" valves
1401441580-85267/305 
1401441680-8630558cc chambers, 1.84"/1.5" valves
14014440803051.84"/1.5" valves
1401982180-86350 
1401992479-81267 
1401992680-86350 
1401051680-86350 
1402051780350 
1402055581305 
1402055681350 
1402205685350 
1402220680350 
1402230180-86305 
1402260180-86267/30558cc, 1.84"/1.5" valves
1402280180-86305 
14024816 350 76cc chambers, 1.94/1.5 valves
Gen.I crate motors
1403480678-82267 
1403480778-86305 
1403480880-86350 
1403480896-up350 76cc, 1.94"/1.5" valves
Gen.I Goodwrench crate motors
1403481080-86350Truck
1403481180-86350Truck
1403912181-86305Truck
1403912281-86305Truck
1407111480-86350 
1407538180-86350Truck
1407926186350 
1408584480-86350Truck
1408596386350 
1408911986-88350 
1409409386-88350 
1409621755-86350 64cc, Crate motor, 285hp/300hp
72' or 90' center intake manifold bolt angles
1410108187-95305 
1410108387-up350 64cc, Gen.I, also used on crate motors
285 or 300 hp, 72'
center manifold bolt angles
1410112886-87350Aluminum, 58cc, angle plug
1410218787-913051.84"/1.5" valves
1410219187-up350 
1410219387-up305/3501.94"/1.5" valves
2450255996-97  38cc, Bowtie, "SB2"
1st version "mirror ports", aluminum
196cc port, CNC version 280cc port
25500141   42cc, Buick/Chevy aluminum 10' head
symmetrical ports
235cc intake port volumes
2.1"/1.625" valves
3341736990-up350 76cc, Gen.I Goodwrench crate motor
"Hecho en Mexico"
 
Tillbaka