Nice! 2.5 liters is what, Iron Duke or its descendant?
Yes the Iron Duke was the 2.5 151 that was later designated the Tech 4.
It started in 1975 as a non-crossflow engine with the manifolds on both sides of the head and in 1977 the crossflow version was introduced in the Pontiac Sunbird and Chevy Monza.
It was also used in AMC cars and CJ Jeeps until 1983.
In 1982, it went into the DJ-5L Postal Jeep.
In 1984, the Iron Duke was changed to have the same inverted V-pattern as the 2.8 V-6 and was used in dozens of GM, Chevy, and Pontiac vehicles.
The last year of production in a GM vehicle was the 1993 S-10.
Production stopped in 1994, although the engine is still in service by USPS in the Grumman LLV light transport truck.
I've been building a 3.0 Liter stroker version for years for use in the Serise IIA & III, but needed to keep the torque under 185 due to gearbox strength limitations.
With the Defender Style vehicles the limitation is removed.
Shooting for 150HP with 200 FTLBS of torque.