Engine and Transmission Tech

I have noticed some use the Buick/Olds block while others will use with the Rover block as the foundation for their projects. What are the advantages and disadvantages of one over the other? For those that have chosen one over the other, why did you choose what you did? As far as the Rover blocks go what are the differences between the different blocks?



Edited 1 time(s). Last edit at 07/14/2013 05:16PM by J Man.

Rover blocks are as follows; 3.5 liter 1967 to 1976 have old casting style, rope front and rear seals and small valves with 2 bolt main caps. 1977 to 1985ish better casting, bigger valves, rubber seals for crank, and still 2 bolt main caps. 3.9 liter 1985 to 1990 same as previous 3.5. 4.2 liter used a longer stroke crank with 3.9 bore still using post 1976 seals and valves. The 4.0 and 4.6 liter engines came out with new timing covers, 4 bolts main caps, slightly improved heads, and better seals and gaskets. The late 3.9/4.2/4.0 and 4.6 engines do have issues with liners coming loose or moving when warmed up and since they are newer cost more. The BOP stuff is cheaper and for the time pretty advanced. GM made a lot of engines. The early rover stuff 1969-1971 when the rover 3500 and 3500s was sold in the US is rare. The TR8 and rover SD1s were not as common as BOP but for the time available. The 3.9 and newer is made in mass quantities but because its from the uber expensive Land and Range Rovers they are not as cheap as the older engines but you can still find good deals. This is all off of the top of my melon.

I buy 4.0L short blocks, from my local core supplier, usually $100-150. ea. You MUST inspect for dropped or cracked liners. Pressure testing is best, but more $'s. "You can pay me now or....". Good Luck, roverman.