ridecamro

um,m how big can i bore out a 305 block. cause aren't all sbc's the same block so could i go 383 if i found the right bore size thanks

Stekman

A 305 is based off of a 3.735" bore while a 302, 327, and 350, and 377 are based off of a 4.00" bore. It is physically impossible punch a 3.735" bore out to a 4.00" bore. You can, however, take a 305 and put it .030" over, and if sonic testing permits, .060", just liked a 350's bore.

A 3.75" stroke in a 305 yields about a 327 cid motor. A 305 that has been bored .030" yields a 335 cid engine.

yes, SBC's (V-8's and the 90° V-6) are the same externally, however, their internal passages differ slightly as do the main journal sizes.

ridecamro

so how would i go making a 327??

RB83L69

By spending too much.

Cheaper to throw the 305 in the trash and go pay $50 for a 350 block.

What makes better sense: 45 CID for $50, or 29 CID for $500?

Hmmmm...... tough one there..... I'm struggling on this..... can I go consult my financial adviser and see which one is a better deal? Maybe I'd better go consult my race car crew chief and see which one is winning the races too?

Stekman

Why people want to destroke and remove cubic inches has always baffled me.

But, to answer the question anyway, a 3.75" stroke would be needed (400 crank). Or, any crank labeled as a "383 crank." But again, as RB oh so nicely alluded to, the cost of going to a 327 or 335 is far more than the cost of getting a 350 block and working with that.

PHAT89TA

i bored out my 305 .030 and for the price of a rebuild like that, ur better off getting a 350. I met a guy who can get me a 350 with vortec fast burn heads and forged rods and piston for 3200 bucks. my stock rebuild with a .030 over bore was 3k.

ridecamro

ok.. the reason i asked was i'm getting a 305 block bored 30 over. fully assembed beside some parts which i already have. for 300 bucks . but your saying i shouold just go find a 350 block bore it to a 383 then build it up

RB83L69

I didn't say "you should bore it up to a 383", because that's not possible; and because .... I didn't say that.

The usual reason people give for thinking that the 305 stroker thing is the way to go instead of getting a 350 core, is that they are "going to use what they already have". Well, the fact of the matter is, either the stroker 305 thing or a normal 350, involves getting something you don't already have; it's just a question of what.

$300 for a bored 305 block is not any kind of a deal. You can get a bored 350 block for the same price. You can even use your 305 crank and rods in it, if you want, and it will still be a 350; you'd probably want to have the balance checked, if you use it with 350 pistons, though. But you'd be doing that anyway of course.

But, if you're intent on stroking something (hehehe), the "internals" that you have for a 305, are utterly useless no matter what; so you're back to the basic question: $50 for 45 more CID. It's the cheapest power you can buy.

In this hobby, a good smell test for cost/benefit ratio, is that if you can buy horsepower for $10 apiece, it's a decent deal. Much more than that, maybe not so good of a deal. Much less than that, what are you waiting for? So, assuming you build a fairly hot motor and get 1 HP per CI out of it, those 45 CIs will give you 45 more HP. That's 45 HP for $50. That's just over $1 per HP. That's not just a "good deal", it's a total steal!! I know of no other means of coming up with power for that cheap.

Now if you're one of those people that just want to spend more and get less, that's fine too; not my problem, and I have no further advice to offer you, because it's obvious that anything I have to say that's sensible, won't do any good. It just makes you easier to beat, and it makes it funnier when you get mad because you just spent untold thousands of $$$$ on something, and it's still slow, and you still got beat. In fact, that would move you into the category of people, that when I go to the track next time, I hope one of them is in the other lane.

But I will say, if you're going to stroke anything, well anything else, get at least a 350 to start with, and maybe even a 400. No point in spending giga$$$$ on all that, and not having a mountain motor by the time you get done.

ridecamro

well i already have a 350. yes i know i should use that. but what i was saying was 300 buck for a complette engine.that mean everything. it's bored. also has nice heads and a nice cam i've driven the car before it was a quick lil 3??. he new it was bored .30 over but doesn't know the rest beside what the pervious owner told him. the reason i wanted to know is cause i need something to move my car form point a to point b while i'm building up my 350. then my 350 would go into my 79 berlenatta. and i didn't want a slow pos in thier and i thought for 300 bucks it would be a nice deal

RB83L69

OK; then...... What's all that about? What are we really doing here?