Im going to bore out my 305 to a 327 and i just wanna know the liter that is.....i know alot of ppl are just going to tell me its pointless to bore out a 305 but i dunno somethin about a 327 Tuned Port sounds nice...

 

It would be about 5.4 litres or so, but good luck boring out a 305 to a 327. You'd have to increase the bore by over 0.125".

 

302/305 = 5.0L

327 = 5.3L

350 = 5.7L

400 = 6.6L

 

It doesn't work that way.

 

it's still a 305, be a neat trick to bore a 305 to 4" 327 bore. might even be cheaper and make more sense to get a 350 block to start with or is a 350 block really a 327 block?

 

Im pretty sure the 302/327/350 blocks are all the same with a 4" bore. If you are going to do a bored 305, you might as well play it safe and do it right. stroke it with a 400 crank and bore it .030 over. That makes it like a 331. The problem is that you just took a motor with a poor bore to stroke ratio and made it worse. The smaller bore of the 305 is a PITA because your valves are still shrouded more then on a 4" bore block. I just picked up a 4 bolt 010 350 block a couple days ago for $40. If you can find a 350 block for under $100, it just doesnt make sense to build a 305. Why start with a bad foundation when it doesnt cost much more to step up to a better block?

 

Pointless isn't the point. Possible is.

In order to get 327 cid with a 3.48" stroke, you're looking at a 3.867" bore. That's 0.131" more than a stock bore 305. That's also about twice what you can typically safely bore a stock 305 block casting.

For the record, a stock bore 305 with 3.75" stroke is 328.9 cid.

 

I wish people would stop thinking they can make a 305 into a performance engine like the 4" bore SBC blocks. Yes a 305 can make a lot of power if you throw a lot of money at it but it's so much easier with a 4" bore block to start with.

It's like a 400 SBC and a 396 or 402 BBC. Bore and stroke are almost identical. The BBC weighs slightly more. Both in stock form produce about the same amount of power however the BBC because of the better/larger heads can easily out perform the SBC for the same amount of money spent on upgrades.

I was always under the impression that a 305 with a 400 crank would make 334 CID. Normally you're always going to do at least a .030 overbore like building a 383 from a 350.

 

Never mind the LSx engines breathing down the BBC's kneck.

Times they are a changin'

O'l Bob Dillan sung that. No words could be more true to this subject at hand.

 

Correct. There has been mention in the past of making a "327" just by stroking a stock bore 305. Typically, though, you need to overbore to clean up the cylinder walls when making a stroker.

 

While the LS engines are nice, bigger is always better. While you can make a big ci smallblock, either Gen 1, 2 or 3, you can always go bigger with a big block. If you have a big block 454 with a bigger bore vs. a 454 SBC that has to be stroked way out to reach those ci and has a small bore, the big block is going to be better because it has a superior bore to stroke ratio. The bigger the bore, the bigger the valves you can fit and the bigger bore allows the valves to be unshrouded more. Plus, you can take that BBC 454 out a lot bigger then you can that 454 SBC. Just my $.02

 

there is a 388 on an engine stand in my garage. i bought a 350 (the entire motor) so i have a lot of internals from it. when i take out my 305, will the used crank from the 350 fit in the 305?

 

Off-topic, but "fit" - yes. "Work properly" - no - not properly balanced.

 

Yes a 350 crank will work but it wont increase displacement as a 305 and a 350 have the same stroke, 3.480".

 

88blkiroc, I would be affraid to open up your hood...that red scorpion on your engine looks like it could be dangerous...

 

1L - 61ci

Considering the price of quality machine work, it is almost not worth it to do anything to a 305 besides a .030" cleanup or a 334ci stroker. The Bore is too small to fit really good flowing heads and there are not too many pistons available (most of them are cast or hyper).

You can buy a ZZ4 short block for $2k..... just need heads, valvetrain, and oil pan.... other 305 parts will bolt up (most of them anyway).

 

How about a 377?

 

Its is deadly, a lot of mustangs found out the hard way.

 

where 61ci = 1 liter....


377/61 =~ 6.18L ... or more than likely rounded up to 6.2L

 

where did u get blocks for that cheap? please tell me

 

350 blocks are a dime a dozen, they aren't hard to find for $100 or less.

 

well can u tell me where.

 

Actually, I think the 400 CI is a 6.5 Litre, not a 6.6 (at leaste the 67 goat was a 6.5 Litre, and that had a 400 small block in it...the XXX car)

 

1977 Pontiac Trans am, 6.6 TA on the cowl. 400 Poncho.
400 sb chev is same cubes so.....

Unless they were rounding up like the ford 302...

 

i wish cuz id be hoarding them... here in Kissimmee you'd be lucky to find a 350 block. In fact in my search for one, i had the junk yard dudes asking me to let them know if i found one( yea right)

 

You have got to be kidding....

Every time I walk into a boneyard anywhere in the country that I've lived, there's about 300 Chevy trucks in it. PRACTICALLY EVERY ONE from 69 to 95 has a 350 in it. Probably 85-90% of them. There are literally millions and millions of those things around.

Last time I was in the Orlando area, about 1 in 10 vehicles on the road outside of the tourist areas, was a Chevy pickup. (About another one in 10 was a F*rd pickup). It is BEYOND UNBELIEVABLE that there are no junk 350s in your area. My daughter is going down there this afternoon; I'll ask her to report back on the situation, and see if anything has changed.

Don't make up lame excuses for doing something stupid and lazy. Put your brain and your motivation in gear.

 

A quick search on www.car-part.com using 1990 GMC Truck 5.7L VIN K returned 30+ hits in Florida, including several at this place:

All Foreign and Domestic Used Auto Parts USA-FL(Orlando) E-mail 1-800-901-2186

Don't take the prices the site lists as the gospel, call the listed shops near you and negotiate for just the longblock or shortblock as your needs dictate.

 

maybe he meant 350 - 4 bolts
but yea, 350s are dime a dozen everywhere..

 

yes.. 4 bolt 350s are hard to find... i was lucky to find one from my teacher..... if you daughter reports more than i had found dont hesitate to let me know.

oh and orlando is 1hr away from me and half a pint of trans fluid( bad leak) so i was really focusing my search to within 30-45 from me

 

It doesn't matter if the block is a 2 bolt or a 4 bolt. If you really think you need 4 bolts (probably not), you can machine any 2 bolt block to take a 4 bolt cap. A 2 bolt block can be machined for 4 bolt splayed caps too, which is stronger than a factory 4 bolt.

 

i was really relying on a tight budget.... the splay conversions are pretty expensive... about as much as i payed for my block.... but yea i suppose if i had the extra money i could go two bolt to 4 conversion..... or how bout 6 bolt!!!! anyways, whats done is done

 

I don't know what your definition of "tight budegt" is; but if you don't have enough "budget" to go get a 350 block, you don't have enough "budget" to do that other stupider thing either. And if you're planning on something where you think your 350 would have to be 4-bolt, I doubt a 2-bolt 305 would be a wise place to sink $$wheelbarrows full of money$$ on that kit.

A factory 4-bolt setup won't do much of anything for a performance buildup. That's not what it's for. Don't worry about it. Just go get a 350 block, and be done with it; and put that other stupid thing out of your mind. It's an expensive detour down the dead-end road to disappointment and poverty.

 

I just got it from some dude off of a local racing site in Chicago. 350 blocks, even 4 bolt blocks, are pretty plentiful up here. I know of at least 2 or 3 close friends that have 010 4 bolt blocks in their garage right now. Granted I just got a good deal, but there are a lot of blocks out there. Hell, I've given away 2 bolt 350 blocks just to get them out of my way.

4 bolt conversions are tough to do right, expecially splayed caps btw.

 

my tight budget is basically $400 a month... half of which goes straight to my mom to help out w/ rent. most of the rest goes to gas and food....... i save what a i can and buy what i can

 

im going to school to be a machinist and ive got 6 350 4 bolts on my bench, there not hard to find, theres a place in WI were every 1 out of 2 blocks u pick out are 4 bolts and the complete motor is only $75. and one of my buddies has made 5 2 bolts into splayed mains, each one for less then $175.