I've happened upon a pretty killer deal on a whole bunch of BBC goodies from a guy locally. He's got a 4 bolt main block, freshly vatted and bored +0.030", a set of 4.280" Venolia forged pistons with big domes, (around -40 to -48 cc's. He doesn't remember and is looking for the paperwork on them. He stated that he remembered that they were supposed to yield 12.5:1 compression with "regular open chamber heads") He's also got a set of Venolia forged aluminum rods (that were ordered with the pistons), a forged Scat internally balance 4" stroke crank, balancer, nice oil pan, nice aluminum timing cover and some other goodies. Everything (except the block, obviously) is brand new and unused. He was still in the parts collecting stage. The rotating assemby has not yet been balanced. I will have the piston to cylinder wall clearance machined/finish honed to be appropriate for use in a boat.
I'm wanting to build a 700-800 HP NA engine for a lake boat/hot rod that I could spray in the future. Figuring on running a solid roller cam, quality roller rockers and girdle, but haven't gotten to the point of picking those parts just yet. So, I'm not building a super radical engine. I can pick up this block, rotating assembly and other parts for $1,500. I think that it's a good deal for the parts.
Would it be wise for me to try to integrate these brand new Venolia rods into my build, considering my HP and usage goals, or should I sell the aluminum rods and buy a set of quality forged steel rods, to possibly have a bottom end that will require less maintenance and checking? I've been reading a lot about the forged aluminum rods and it seems that they don't experience the permanent stretch that many talk about. From my reading, the aluminum rods experience approximately 0.010" more stretch during use than steel rods, do to the heat related expansion properties of aluminum than steel. So, I seems like that can be and counted for while setting deck height. I guess guess that I need to figure out if these rods will give me benifits that outweigh diminished long term reliability. I'm sure that it can become quite the discussion between health a that he two. I'm just trying to figure out if I can use these for my application or if I should sell health a that he working he seem and buying steel rods?
I would love to some day race in the Comp Jet class, but that's not a primary concern with this build. Boat is a '70 Cheetah, 18' and some chage. Berkeley 12-JG pump. Pump will be getting a full rebuild, appropriate impeller, new Place Diverter and a snoop. Will also being researching grates/ride plates/loaders to get the pump set up properly.
Thanks for any help/advice/guidance!