3.75 stroked 305

What do you guys think of a stroked 305. I know it will increase low end torque, but I think that might mess with the stroke/bore ratio too much.

Anyone tried this?  

there is/was a thread here somwhere that disucssed this very idea...seems like it had quite a few respondents too...most wanting to know why someone would go thru the trouble of stroking a small bore motor...you can use the site search to find the other thread  
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the red-headed step-child of the mailing list

fuzzy dice, air shocks & N50's rule

ok thanks, didn't know there was already a thread  

i don't remember the intro line...and it has been awhile since it was actively discussed but there is one somewhere  
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the red-headed step-child of the mailing list

fuzzy dice, air shocks & N50's rule

sell it,get a 350 block. thast all you need to know.  

Ya its pointless to stroke a 305 when you could just make a 383.Why would you wanna leave that kinda power on the table.  

Don't want to break my drivetrain.
The motor is getting rebuilt after I run it for another year, and I am just considering my options.  

The T4 can take a mild 305, with a good driver. Bolt in a 350 or something with more power, you have pile of metal, unlesss you are extremely careful. I don't want to have to worry about it breaking in the middle of an event.  

if you make enough improvements to the 305 it will eventually make as much power as a mild 350 and the T4 will wind up being a pile of metal anyway...maybe you should think about upgrading the tranny too...it's hard to build only the motor and not break something afterward  
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the red-headed step-child of the mailing list

fuzzy dice, air shocks & N50's rule

+1  

I only want to make about 300hp and 300ft lbs. Don't want to go past that. I don't plan on spinning the motor past 4800 RPM anyways.

The transmission should be fine. It will be getting rebuilt soon. Also have switch to 1 piece shafts for the rearend, before I race it again.  

That would be a pretty pointless endeavour. The rod stroke ratio would be so out of whack, the engine would have horrible parasitic loss.

For the money you'd spend getting a stroker kit for that 305, and the money to machine the block and do everything else, you could get yourself a low mileage 350 long block, throw in a cam and maybe some upgraded heads, and make more torque than your 305 ever will, it'll be much cheaper, and you'll have an overall better engine.  

Agreed the 305 isn't worth stroking.  Also what events are you using this 300hp engine for and in what kind of car?  You could build a very mild 350 for the same money and be better served.  If you must use the 305, upgrade the cam intake and heads, and you should be pretty close to where you want to be.  Leave the stroking for the big bores.  

First of all, forget about the bore stroke ratio being all out of whack. That engine has no idea what its bore to stroke ratio is, nor will the car that it is going into care either, other than the fact that it is ”thrusted” by its torque. Next, leave the stroking to the big bores? What's a big bore? The answer is nothing more than a matter of opinion.

Stroking the 305 (3.736B x 3.48S), there is nothing wrong with it and this is why. Two engines by the General come to mind that worked perfectly well for many years, the Buick 350 and the Pontiac 350. The Buick is undersquare (3.80B x 3.85S) and the Pontiac is just past square (3.875B x 3.75S) (oversquare). Both engines were put in cars from Nova size up to B body size with no problems what so ever. You put gas in them and go, they don’t care.

I swapped out a 305 Chevy for a 350 Buick placed in a Caprice. Basically doing what you want to do cubic inch wise but the Buick already comes with a long stroke. Going from the 3.48 crank in the Chevy to the 3.85 crank in the Buick made a big difference. The Buick engine will take the car up any hill in my area much better than what the 305 did, not the 305 was something to sneeze at. The 305 worked good but was losing oil pressure.

The benefit of doing what you want is that you have the same incredible variety of parts that the 350 Chevy has. You can even buy the small port high flowing heads that the aftermarket makes that are similar to Buick heads. Basically there is no loss in your end results except money which would be spent anyways if you were to do a 383.  

It is an '82 Jeep Scrambler. It is used in mud racing.

When I rebuild it, the plan is to use a Comp XS256S, do a little head work, and bore it .030, not sure about anything else.

I have put on a Holley 4160, Edelbrock EPS, and Headmean Headers. I also changed the water pump, fuel pump, oil pump, and distributor.