Twin turbo on a 327 Engine... help needed

[Supervette]

I wanted turbos too but just because of all the costs I went with a nice procharger set up. They bolt on easy and if you run E85 you do not need an intercooler. By far a efficient way to do a build. No complicated exhaust work or an oil line. What you will put into cylinder head work you could have a blower at your door step! A P1SC should do you some justice. Superchargers 4 less has good pricing. Do you have E85 in your area? The P1SC is even up gradable to the D1SC I believe. I think its just an impeller change. They also have an upgrade program they release from time to time. Buy the biggest rib belt you can get with the set up.

[Mr_Roboto]

10K is a pretty decent budget. I'd do an EFI fuel system with one of the new Walbro pumps. some 60lb/hr injectors and a Microsquirt probably. There's a pretty steep learning curve to it so be prepared for that. Hard to beat for the price though. Besides that I would consider a wide band mandatory stuff if you do a carb or EFI, if you do carb don't forget the data logger is an extra expense. 14point7.com sells a really small "OEM" unit that I'd use if I was doing a regular MS-II. In regards to your Impy I would see if a late model 9C1/Impala SS tank would bolt in. I know that they can be put into A-bodies with some work not sure what the changes are on the B-cars. They would also take the previously mentioned Walbro pump. Some 3/8 or -6 line would get you where you need to be for 500hp as well. Buick guys can make that with the stock feed line which is 3/8.

In regards to the turbo system, if you can get some decent used GN turbos they'll get you there or a set of HY35s off Dodge trucks. There are several variants of the latter made so be sure you get the same ones. I'd do a mild to moderate cam and some mild head work and get into the high 200hp low 300 HP range then run a decent set of rods/pistons on a production forged crank and go from there. By keeping the RPMs low you could even probably even go with a stockish replacement like SIRs.

Lastly a turbo IS like a cam. That's for better or worse. You put a set of turbos on a 396 BBC then put them on a 502 BBC and the RPMs they come in at and top out at will go down. If you stick a set of huge turbos on a 302 CID engine you've basically done the same thing as sticking a 244/[email protected] cam in it. You're going to have to wind it up to make the power and it may be a bit lacking in subtlety.