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Firebird Block and Crank Codes

Year

Block Casting Code

Engine Codes

Crankshaft Casting Number/Part Number

Displacement

Notes

1967 9782000 ZK, ZR, ZD, ZF, ZS, ZN, ZG, ZE, ZL, ZM 9782279/9782279 230 OHC-6 Firebird and Tempest; use pilot bearing (P/N3752487) for MT
1967 9786339 WC, WH, YJ, XI, WK, WO, YM, XO 9782770/9782770 326 Armasteel
1967 9786133 WZ, WU, YT 9795480 400 note: unconfirmed
1967 9786133 XN, WQ, WI 9795480 400 RAM AIR I note: unconfirmed
late 1967-early 1968     9773524/9773524 400 Nodular
1968 9795066 ZK, ZN, ZD, ZE 9790154/9790154 250 OHC-6 Firebird and Tempest; use pilot bearing (P/N3752487) for MT
early 1968 9790079 WC, YJ, WK, YM 9793573/9793573 350 Nodular
1968 9790071 WQ, WZ, YW, YT 9795480/97954 400  
1968 9786133 XN, WI 9795480/97954 400 RAI
1968 9792506 XT, WU, WY, XW 9794054/9794054 400 RAII 4 BOLT Armasteel
1969 9795066 ZC, ZF, ZH, ZL, ZK, ZN, ZD, ZE 9790154/9790154 250 OHC-6 Firebird and Tempest; use pilot bearing (P/N3752487) for MT
late 1968-1969 9790079 WM, XB, YE, WN, XC, XL, YJ 9795479/9795479 350 Nodular
1969 9790071 WZ, YT 9795480/97954 400 Nodular 2 3/4" flange
1969 9792506 WQ, YW, WH, XN 9794054/9795481 400 RAIV 4 BOLT, Nodular.  0.001" more clearance on rods and mains.
1969   -- 546270/546270 303 Forged, Limited production 2.5" main
1969   -- 545671/545671 400 Forged RA V, marked $A or V24
                       
1967-1970 400 AS 9795480 97954   3.75 3.00 2.25 3.00 2.760  except Ram Air note:unconfirmed
1968-1979 400 N 4813 4813 N 3.75 3.00 2.25 3.00 2.760  both "N" crank and standard w/ 2 3/4" flange note:unconfirmed