Join Date: Dec 2010
Location: Milwaukie (Oak Grove), Oregon
Re: HSC 2.3, 2.5 Four Related to 3.3 Six?
The "Lima" 2.3L four-cylinder had a 3.781" bore and 3.125" stroke whereas the HSC 2.3L had a 3.682" bore and 3.294" stroke.
When supplies of the 3.3L six were exhausted during 1983, the plant where these engines were produced needed an idea to keep production going. Basically, after removing the fourth and fifth cylinders, while retaining the 3.682" (93.5 mm) bore of the 3.3L, they did increase the piston stroke length to 3.294" (83.7 mm) to achieve 2.3L.
So, while the two 2.3s may be similar in terms of displacement, it should be known the Lima engine is a SOHC unit while the HSC 2.3L (and 2.5L) is OHV.