Issued:        Feb 28, 1975     
Revised:       6-13-75, 6-27-75, 4-2-76, 2-24-96, 2-20-97, 7-1-99, 5-24-01
Bulletin #:    BUI-75    Page 1 of 1

Specifications for the   1975 Buick engines

H.P. Disp.     C.R. Ind. Make Model/Transmission          Manifold  R.R. Lifter	Head cc   Notes 

105  250       9.21 1-1  Roch 7045017/SM     7045016		 352191  1.75 H	67.50       1,3
110  231       9.23 1-2  Roch 7045145/SM     7045148		1248470  1.53 H	42.70       2,6                   
110  260       9.20 1-2  Roch 7045297/SM			 550559  1.60 H	56.03       4
145  350       9.61 1-2  Roch 7045140,3/AUTO ONLY		1249167  1.55 H	50.00       6
165  350       9.61 1-4  Roch 7045244,6/AUTO ONLY		1249169  1.55 H	50.00       5
205  455      10.28 1-4  Roch 7045240,548/AUTO ONLY		1247331  1.55 H	73.00       5

Notes

1    Alt carb - 7045314/Auto
2    Alt carb - 7045157,7045447/SM  7045149,7045448,9/Auto
3    Carb sizes - 1686/1313
4    Carb sizes - 1375/1093
5    Carb sizes - 1375x2250/1218xAV
6    Carb sizes – 1686/1093
            Deck    Piston Type                   
H.P. Disp.  Cl    Dish/Dome Ht/Vol		Valves    Cam Lift       Springs        Notes 
105  250   .011   Dished    .077"   7.67cc	1725/1425 401/377        Outer Only
110  231   .035   Dished    .235"  23.50cc	1625/1425 401/377        Outer Only     1
110  260   .003   Flat				1527/1305 440/440        Outer Only
145  350   .010   Dished    .235"  23.50cc	1880/1555 392/408        Outer Only     1,A,B
165  350   .010   Dished    .235"  23.50cc	1880/1555 392/408        Outer Only     1,A,B
205  455   .010   Dished    .140"  14.70cc	2005/1692 397/413        Outer Only     1                         

A If TRW L2342 piston is used the legal dish depth spec will
  change from .235" to .230".
B PISTON DISH DEPTH ADJUSTMENTS- BADGER B422 .218 DEEP, ENGINE TECH P1504 & SILVOLITE 1746 .215 DEEP, BADGER P422A .210 DEEP, GM #25527180 .210 DEEP 

1    Exhaust valve springs have Outer w Damper 

H.P. Disp.     Gasket    	Head Cast                               

105  250       .032		355795,3997180,331183,331184
110  231       .021		1249175
110  260       .014		550362
145  350       .041		1243452
165  350       .041		1243452
205  455       .041		1246322