Chevy Generation I ,original small block

265 in³ (4.3 L) 3.75“ (95 mm) X 3.00� (76 mm)
1954-1956
162 hp to 240 hp

283 in³ (4.6 L) 3.75“ (95 mm) X 3.87� (98 mm)
1957-1967
185 hp to 315 hp

302 in³ (4.9 L) 4.00� (102 mm) X 3.00� (76 mm)
1967-1969
290 hp

307 in³ (5.0 L) 3.875� (98.4 mm) X 3.25�
1968-1973
115 hp to 200 hp

327 in³ (5.4 L) 4.00� (102 mm) X 3.25�
1962-1968
250 hp to 360 hp

400 in³ 4.25� bore X 3.75�
1970-1979
240 hp

262 in³ (4.3 L) 3.67� (93 mm) X 3.10� (78.7 mm)
1975-1976
110 hp

267 in³ (4.4 L) 3.50� X 3.48� (88.4 mm)
1979-1982

305 in³ (5.0 L) 3.74� (95 mm) X 3.48� (88.4 mm)
1976-2003
130 hp to 250 hp

350 in³ (5.7 L) 4.00� (102 mm) X 3.48� (88.4 mm)
1969-2000
125 hp to 370 hp



Chevy Generation “X�

LT5 DOHC 349 in³ (5.7 L) 3.9� (99 mm) X 3.66� (93 mm) ZR1 Vette
1990-1995
375 hp to 405 hp (LT5 DOHC or quad cam)


Chevy Generation II, LT series

LT1 (4.3 L to 5.7L)
1992-1997
200 hp to 305 hp

LT4 (5.7 L) 4.00� (102 mm) X 3.48� (88.4 mm)
1996-1997
330 hp


Chevy Generation III, LS series

LS1 346 in³ (5.7 L) 3.90" X 3.62"
1997-2005
305 hp to 350 hp

LS2 346 in³ (5.7 L) 3.90" X 3.62"
2004-2006
400 hp

LS4 325 in³ (5.3 L) 3.78" X 3.62" (front drive application)
2006-??
303 hp

LS7 427.6 in³ (7.0 L) 4.125" (104.8-mm) X 4" (101.6-mm)
2005-??
505 hp

LS9 6.2L
2010
600 hp (supercharged)

Vortec 4800, 5300, 6000
LS series truck engines

Isnt the LT5 a quad cam for the Zr1 vette? I believe aston martin helped GM design them with 4 camshafts and Gm actually had mercury marine put them in the car.

and i think the LS4 which is in the V8 impala produces 303 hp

That is exactly what it is, GM used to call it a Twin Double Overhead Cam, Two cams on each head, for 4 cams total. Gets confusing when you get too fancy with names. Correct about the LS4, looks like a typo & will fix.

The LS2 is 364ci by 4.00 x 3.62

Also the LS3 is 430hp at 372ci by 4.06 x 3.62 2008+

The 283 is 3.875" X 3.00" (98.4 mm × 76.2 mm). The 400 is 4.125" X 3.75" (104.8 mm × 95.2 mm).