Throughout the year or so that I have been a memeber to this message board I have read a lot of interesting and often very technical things about a lot of stuff I do not understand. Thus the making for this post. In my reading I have gotten the general concesus that a 305 is crap and don't touch one with a 10 foot pole. I do have a 400 HP 350 in my truck but I was recently given a 1985 caprice classic with a 5.0 liter 305. Now I know what you are all saying at this point. What a pile of crap get rid of it. However I have a place in my heart for 1980's GM B-bodies because on them is where my best freind and I learned how to wrench on cars. So it is this project that we will be pursing next summer. Here is where it is going to get a little crazy. At our local junkyard there is a goldmine of early 90's Saab's and other cars with turbos. So far tentative plans are to Bi-turbo the 305 with said junkyard turbos. I am not doing this to try and build a 10 second car or race vette's. I mearly want to try something new learn about the various processes along the way. My knowledge of going about such a transformation is limited and that is why I am asking for everyones help. I would like to know what I would need to do to the engine to get it ready for the turbo's? I am thinking new head gaskets. Keep in mind that I do not care if the engine blows up. I do not want to spend any money on any new internals for the engine at all. I will be giving it a tune up and various other needs to ensure that it runs. I merely want to slap some turbo's on a 305 and see if it works. Again keep in mind this more educational than anything else. I am also a 20 year old with a love of speed and HP. I also like things a little out of the ordinary and I think a 1985 305 Caprice Classic with twin turbo's would fit that bill pretty nicley. Any and all comments welcome. I am just asking for a little technical advice so that we may pursue this project and see what happens. Thank you all -James  

you want to slap a pair of turbos on a 305 which you don't want to spend any money on. Not only does this sound impossible, this sounds stupid, if you have no intention of wanting a fast car, why make life miserable with a turbo? I'd find something more worthwhile to put the effort/time/money in if I wanted a turbo, something that I at least could/wanted to race.

Ok I like the 305 and with twin tubos you can push well above 500hp so racing a stock vette with an 85 caprice is possible as long as it's in a straight line.  First off the 305 compression would not allow you to run significant boost, so I would switch your heads to 350 heads, your going to want allot more flow than stock heads so I would read the entirety of gib and bogies discussion on porting and look into some of the recomended links.  If you are willing to buy some salvage yard parts, I would look to the 305 ho for the rods they are supposed to be pink rods as opposed to the stock ones maybe even look to newer powdered metal rods from a vortech motor.  I do not know if the ho had a forged crank, I just buy the heads for my 307, and I am content with my 325 hp.  You are going to want to drop some loot on a cam designed for a turbo, not much money in the sceme of things.  Since an 85 should be carb, you may want to look at electric fuel pump or fuel injection. an adjustable fuel pressure regulator, oil lines a spare oil pan in case you tap it in a bad spot, a dry sump syestem would be better but costly with acumulator and all.  A FMIC or Front Mount Iner Cooler is massive help although not required.  A pair of shorty headers you can flip upside down, the turbo flange it is mounted to, a bonnet for your carb, tbi, tpi which ever you run an adjustable timing syestem MSD, or the like, some exuast tubing and a welder, mig should work fine.  palteing should keep the temps down but exhuast wrap will work.  Turbo Ted on the Car Craft forum can get you a spread of which turbos would work best, Turbo Dave is the owner of the twin turbo camaro that graced last months cover.  I believe Turbo Ted said a pair of Mitsubishi 16 g's would get my 307 up to about 600 hp.  The 16 series is fairly coveted by dsm fans though as it is there largest found on the new evo 8  mr2.  the 14b is readily available and would serve a 305 great with a bit less spool time.  a fully adjustable external blow of valve or bov is esential as the stock internal ones on the turbos are often faulty and do not offer as precise adjustability.  The parts seem over whelming but it can be done on the cheap as long as you can weld.  I recomended The car craft thread which contains links to to high psi etc...  Honestly if you were willing to go with a good crank and pistons you could put about 700 hp to the rear with proper parts selection from your 305 then again that would blow rear ends and trannyes not that 500 wont but it is allot of time to set up and tune you may as well reap the rewards.  all said and done youre looking at about a thousand dollars with mostly used parts though for all new components you would be looking at 3k minimum likely more.  Turbo Daves is a blow through or carbed syestem on a big block that puts down scary track times.  I would avoid the Saabs turbos but thats just because so many drivers of saabs don't let them cool down before turning off.  they go in for replacements often, atleast the saab owners I know.  If you want an inner cooler but want to save cash an FMIC is usually about 500 bucks I would look to the mitsubishi/crysler/Eagle SMIC or side mount they bolt to your fender though they get less air flow they are among the best stock ones so they will be in said JY.  If not they can often be found online when others step up to a FMIC.  For the BOV I believe GREDDY has a good one out for about 70 bucks.  since you will have maoderatly high compression even with 350 heads and stock internals I would keep your boost down below 9psi probably in the 6 range.  It is possible to run one bov near the bonnet where your pipes merge but a safer bet to run one on each turbo.  If one sticks youre gonna want to shut down quick or have a rev limiter, which I believe most adjustable timing syestems have.  Oh yeah and the most important two things are a tape mesure and tons of patience.  Good luck and keep us posted.  Even with low boost you should be able to stomp your truck and get high tens, provided you have traction and gears.