I saw a post about stroking a 305 and they were talking about using a 400 crank. Would a 305 crank be able to work, along with boaring .03 over.
I don't know though if that would work.
I'm sure this has been thought of before, but I looked for it. I must not have looked hard enough because I didn't see anything about it.

 

350 and 305 have the same stroke. The crank is even the same casting, although in some cases the balancing is slightly different to make up for the slightly different piston weight. So if you put a 350 crank in a 305, you come up with ....

{insert drum roll here}

.... a 305!


IMHO it's a waste of money to stroke a 305, as you no doubt noticed in that post. Yes it works, yes it will make a more powerful engine than a 305; but, in terms of HP/$, or HP/work, or any other common measure of efficiency in getting from less power to more power, it's a terrible idea. Very big expense in exchange for very minimal gain. It's far, far cheaper to just buy a 350 and rebuild it, and get more power for less $$$ that way. Personally the idea of paying less and getting more appeals strongly to me, but some people evidently have a problem with that. Draw your own conclusions.

 

I will eventually put a 350 or larger motor in my car in the future, but for now, I want a 305 that will be faster than a 350.
After I hand someone thier @ss I want to see thier expression when I tell em I got a 305 LG4.

It now has a TPI sitting on it as well as a CAM and full 3" exhaust with a custom SLP Prom.

 

Zepher, not sure what that has to do with the topic, but, happy dreaming, anyway...

 

My understanding is that the crank counter wieghts on a 305 are offset a bit versus a 350. I wouldn't call that a small balance problem, but a NIGHTMARE to the crank guy ...

I agree with 'RB83L69' on this one 100 percent.

Sort of like a Rube Goldberge machine. - Making somthing simple, into a complicated machine.

Ron

 

Well, that answers my question then. I just wanted to know. So, it is possible, but you just wont accomplish anything by doing it then.
So then, this is why they use 400 cranks? They are actualy different.

Thanks for the info about it.
I'm currently looking for a 350, but am open to any other ideas to make the most from what I have. If I do go 350, I'll probly go 383 Stroker. But that's all in the future when I actually have the money for it.

 

yeap, the 400 crank pulls the piston down 3.75 inches versus 3.48 inches of a 350, and or 305 Crank.


Ron

 

Zepher, if it's got TPI, it's not really much of an LG4 now is it? Where the block started isn't really saying much.

As for stroking a 305, I totally agree that it's a waste of money. You're talking about the land of diminishing returns when you stroke a small-bore motor. Once your stroke approaches your piston diameter (305 stroker has a 3.75" bore with a 3.48" stroke), breathing becomes a major problem. For one, you can't fit big enough valves into the heads to feed that sort of displacement. With otherwise identical equipment, I'll bet that a 334 won't make but 5 or 10 more horsepower than a 305. Neither would a 350, BUT, you've got more airflow potential with the 350, so you don't need to use an identical setup, but with the 305, you really haven't got many choices.

 

I know it's technically not an LG4 anymore, but it's still a 305 in a 3rd gen.

 

I believe Super Chevy built a 334, with Torquer heads, ASM TPI kit, with big runners, misc. other stuff needed, and they hit a whole 302hp. And at 4800rpm, the engine hit a wall and dropped almost 100hp. Don't do it.

 

Sounds like to me that you are building the 305 to make a point. So why don't you build a 350 and tell everyone it's a 305. Looks the same. Only you'll know the difference unless some crazy fool wants to decode the block. I took the 305 out of my car and put in a 350. Best thing I have ever done.

 

I am building a 350, already have the block and crank, going to go with new pistons and rods.

I just want a crazy fast 305 till it dies. Heck, it was faster than it should have been, ran a 14.94@91.67mph in the 1/4mile, faster than my friends 85 305 TPI A4 car and he mods on his, his best is a 15.4? @ 8?.??mph.