hey guys i have a 1984 Camaro Z28 with a low mileage Carb'd 305. Motor is completely stock except it has headers and a 3" cat back. Now as for the drive line its matched up to a T-5 transmission, stock driveshaft, 4th gen 10 bolt auburn posi 3.42 gears disc rear end, boxed control arms, adjustable panhard bar, poly used from the tranny back.

Now i was planning on just doing some work on the valve train (cam, lifters, push rods, roller rockers, longer rocker studs), and in addition to that throwing some nitrous at it as well. This is and will be when done pretty much a stock 305 minus the valve train and drive line. I'm not to concerned about the motor blowing as this work is mainly just for fun. When the winter is over ill be taking it to the track and seeing how much i can throw at the engine.

My question is how do 305's react to boost?can the handle it? will it make any power at all, is it worth it?keep in mind ill be building it on a budged, spending a total of about 1200 bucks, and don't say thats not possible, I'm not building a daily. I plan on doing the valve train no matter what, i guess the main question is will nitrous be a better option then boost for a 305?

Or will the 305 just love the boost, and maybe be able to take it and live through it?

anyways, any info you guys can give me would be great.
Thanks
Merry Christmas

Matt

 

If the 305 was put together with forged, low compression parts, I suppose you could throw a lot of boost to it and it would "stay together", but the bigger question is why? The 305's don't have a very good reputation of making much power to start with. 1st gen. s.b. 350 motors are readily available and one that could survive in a forced induction environment could be had for a reasonable price (which will be necessary in a very short while anyway if you bolt a twin turbo system to your 305). I don't think I would bother to upgrade the 305 and then spray/boost it...you will probably be left with no usable parts after it lets go. On the other hand, it could be an interesting experiment to see how many passes the 305 will take with 15-20 lbs. of boost shoved into...I'd bet not too many.

 

I would put the $1200 toward a 350 swap.

 

I say go for it!! Thats what racing/fun/experimenting is all about. It just might last longer than a 350. I would prefer the boost instead of the nitrous though. And I say run it on alcohol!!

 

If you are looking for "fast as possible" and mildly reliable on your budget then you should probably go with a 350.

If you just want to build "something else," then go for it. Why not

 

their will be a fully built 350 waiting for the turbo set up once the 305 poochs

 

Then I say do it. Build the 350 fast though.

 

build it now and swap in the better motor later the best thing is you can take it all off the305 and place it the same way on the 350, exact samething i had been doing with my non-low comp motor waiting to install my 8;5;1 motor....

 

The 305 does have more potential than most people realize. Preston Smith has the quickest 305 that I know of. It runs 9s.
http://www.thirdgen.org/techboard/te...est-305-a.html

 

To answer your specific question about how a 305 will respond to boost...the answer is: depends. It depends on how much boost the motor sees. Any motor wil respond favorably to boost, but in your case, a stock rotating assembly, mid 1980's carbed 305 from a Camaro just won't respond very well. Will it go faster...YES. Will it live for a while...PROBABLY, but not for any length of time. It certainly won't be considered reliable. Are there "fast" 305ci based cars, certainly, but just ask the owners what they have had to spend to get there.

As someone else suggested, the $1200 could be much better spent an a different motor combination. If you have decided you want to go the 305 route, I suggest spending the $1200 on a valve train upgrade and a complete nitrous set-up with all the necessary safety features, you will probably see the biggest bang for your buck. If you haven't all ready, you should research the cost of what a forged, forced induction 305 or larger motor and a twin turbocharger system will cost.

Here is some information regarding how well a 305 responds to nitrous or boost (found on another forum):

Naturally Aspirated
14.07 @ ? (Can't remember the mph)
While many others are signficantly faster than I am, I attribute my slowness to the fact that my engine was built with a supercharger in mind.

Paxton (6 psig boost)
12.57 @ 108 mph (plus or minus)

90-hp nitrous
12.58 @ 109 mph

Paxton (6 psig boost) plus 50-hp nitrous
12.04 @ 114 mph

ATI D1SC (5 psig boost)*
12.26 @ 113.55 mph

 

thanks everyone for your responses.

now ive also been thinking, why not just build a single turbo set up? i really dont need the twin turbo set up, can always upgrade to a bigger turbo.

 

i would also urge you to go single as you have to buy less stuff trust me i am still building my TT kit waitng for it to come to an end for the begining of the year woot woot...

 

I would recommend the single turbo route. You could utilize a Masterpower T70 turbo. These can be bought for $575 new. I've seen them sell for $350-$450 used. You will have to modify your fuel system and your carb, but could do this relatively cheaply. You could run 5-6 psi boost for a long time with no problems...as long as your tune was safe. At this level, you wouldn't even need an intercooler. 300-325 hp would be easy and safe. Later on, the T70 would work great with your future 350 engine as well.

 

awesome thanks ill add that turbo to the list of research,


i think the single turbo is the way to go, as bad *** as a twin turbo would be i think a single is a lot easier to accomplish on my own and on budget.

ill be running an intercooler no matter what, they look badass.

 

However,
If you really are stuck on twins, I'll sell you these twin Garrett 66mm turbos, the ceramic coated SS headers, the 42mm ATR wastegates, and the ceramic coated 3" downpipes for $2500. It should be capable of making 1300hp.

http://www.turbobuick.com/forums/par...-66mm-kit.html