Re: Big bore

Posted by Anthony Pallett On 2013/5/12 3:12:13

The max overbore numbers you put out Tim are those in regards to the post war L8s or the early ones?

I've considered turbo and supercharger setups for my project and the only nitrous I would consider would be on a turbo setup to cool the inter cooler. Nitrous is pretty safe these days but if something goes wrong with your fail safes it will blow an engine very quickly.

A blower (or turbo) of some description at 7ish psi will give about 75 extra horses on a stock 150 hp 327 so 225 with no other changes from stock to there is potential to reach possibly 300 hp with an amazing rebuild cam and some intake magic which would be night and day from stock.

As Craig stated turbo lag is pretty much a myth these days I have known a few Thunderbird turbo coup owners that dealt with it in a stock setup but the tech these days is light years ahead of that now.

The problem I have had in a supercharger setup is packaging a Paxton style would be the easiest you can pretty much mount it anywhere you can get a belt to. I have a 471 sitting on the shelf that would be really good for a L8 engine but mounting it close to the exhaust would be problematic with all the heat in one area and it would look somewhat awkward but if you had a 300hp L8 Packard that would probably be the least of your problems.

In the real world as much as crossing my fingers and putting 4 inch bore sleeves in the engine would be very cool (till the engine blew) I am considering a .125 overbore if the block will take it which would give around 350 cubic inches. Then play around with possibly some big block Chevy rods and fancy pistons to get it all to work.