Well, A bit of faction and fict
When I bought my engine from a bloke in Nottingham at All American Autos, he told me he was building a 350HP chevy with new this, new that etc. I should have know when the engine turned up that he was rubbish as the engine has a broken water jacket, not very good for a new engine.
After a lot of hassle, he replaced the engine, or rather just dropped it off at GD for me to get it installed. The second engine was only firing on 7, and the pressure on each bank was very low. After some investigation, we found out that the pushrods were bent, and had been used before. Anyway I digress, just think twice before you buy from All American Autos.
On to the BHP figures. This chap at All American told me the engine would produce around 350BHP. I was very sceptical after the problems I have had with the engine, so I took it to a local rolling road in Northampton.
The engine was putting out 180BHP, nowhere near the 350 he told me it would. We finally managed to get the engine up to about 250BHP after a lot of messing around etc.
Over this winter I have had the engine re-built by Ken Coleman of Engine Data. We have used turbo pistons, etc etc. The engine has been blueprinted and balanced and normally aspirated porduces 350BHP. With the blower at 12psi, we produce around 520-530 BHP, and then add the intercooler on and it adds about another 50BHP.
These figures are purely vapourware at the moment as the engine has not been dyno'ed. The engine will be dyno'ed at the end of the month and I will let you know what the actual figures are.
I reckon the figures will be spot on as Ken has been doing this for a long time and has the experience to know what an engine will do based on the components he has selected.
Best Regards
Rob