So I'm thinking of swapping a new motor into my V6 after I get the body work in order. Ok,so I KNOW I'm swapping in a new motor but that's besides the point ! lol,anyway so here's the setup I'm going for....I'm going after a turbo or twin turbo(most likely a junkyard twin). And I was thinking a 305 instead of a 350. Simply cause they are alot alike in alot of ways just that the 305 has well less displacement and NO bottom end/low end power in anyway shape or form. But I figured since I was going to slap a turbo on in would it just be cheaper to build up a 305 and slap a nice cam,heads ,with the turbo I'm gonna use instead or spending the extra money for a 350. I'm trying to make this build as cheap as possible for my bird. but I need some input from the experts to see what you guys think. So any input will be GREATLY appriciated !

~BB~

 

Look the kits over for rebuilds, the 350s are much cheaper, breath better, and well the 305 just plain sucks in comparisson.

 

The SBC has enough design flaws as is, and the 305 is among the worst SBCs ever made. Unless you have something to prove or are limited by a class, it's a terrible idea.

 

To back up the other post, go with a 350. The 305 pretty much sucks. The heads are less than sorry, the bore is only around 3.75 (i forget the exact number) and they probably use different journal diameters so nice forged parts or even aftermarket cast parts will be harder to come by. Spend the extra couple hundred dollars and get a 350.

Heck if you need a crank I have a brand new 2 piece 350 4340 eagle crank for sell pretty cheap.

 

I'll bet you mean 2-piece rear main seal. The only 2-piece SBC cranks I've seen were broken ones.

305 and 350 stroke and journals are the same. Production cranks are counterweighted slghtly differently.

Yeah, 305 isn't a good idea.

 

well thanks for all the advice guys,rather be told this now and not in the middle of the build !

~BB~

 

ever wonder why nobody puts a MINIMUM displacement limit in any racing classes? The old saying is quite true.

there's no replacement for displacement!

 

There is when there is a turbo involved !!!!

~BB~

 

Nope, put the same turbo on a 2.0L motor and a 6.0L motor and see which one puts out the most average power

 

Yeah I know so can you imagine a 5.7 with a turbo !!!

~BB~

 

This is why it was/is the longest motor in production. It was all those flaws that everyone wanted.

 

Well flaws is the only way to go....along with riced out hondas and wasting 100's of 1000's of dollars on making imports compete at the NHRA level !!!!

~BB~

 

Just a data point for ya':

305, TFS heads, ZZ3 cam (208/221), TBI, Edelbrock intake, Edelbrock headers: 14.20 @ 96 mph

350, same heads, cam, intake, injection, headers: 13.30 @ 105 mph

Yes, it picked up almost a full second and 9 mph with not other changes than going from a 305 to a 350.

Mike

 

Damn,so this brings me back to square one !

~BB~

 

Using "cheap" and "turbo" in the same thought probably isn't practical. I think you'll find "slapping a turbo" on a SBC in a F-car, and having it work is a VERY expensive process. Of course if that turbo makes any power at all, you'll need to build up the bottom end to hold it, and 305 isn't any cheaper here than a 350. Oh yeah, turbo pistons for a 305 bore are rarer (and probably more $) than 350 slugs.

How much over $10-$15,000 is your budget for this swap? If you are under $5K, build a nice 355, or for a bit more, a budget (never cheap) 383. IMO, better to have a budget runner, than an exotic turbo'd 1/3 done garage princess.

If you are now back to square one, reread this thread. Others have posted some good advice. If you've already made up your mind to turbo a 305, have at it, and good luck.

My $.02.