ive read an article say that a 305 is the same as a 327 except the 305 has a crank out of a 283 or something like that.......is this true ...........if so is it possible to make a 327 out of a 305 .............can you use 350 parts to do it ........kinda like make a 383 out of a 350 .......

hmmmmm

the 327 has the 4.00 inch bore like the 350,  the 305 bore is much smaller, not sure just how much but i can't imagine it could be bored out that much.  there is probably some kind of stroker crank you could put in the 305 to get the cubes you desire.  

Some companies make a rotating assembly for something like a 335 using a 3.75 inch stroke and the tiny 305 bore, but is it worth the time and money? I dont think so.

The 305 shares the same stroke as a 350 (3.48") but has a puny 3.740" bore. Don't throw any real money into a 305, it'll likely still be a turd!!   

The 307 shates the 327 stroke and if you get a 68 on crank you can make a large journal 327 which were only available from chevy in 68 and 69.  they are few and far between, they are the only 327's that came with accesory holes in the heads, if you are building a vintage corvett etc you can find the casting #'s for the heads at mortech, the 305 as stated shares a 350 stroke and I belive a 307's bore although I just pull the heads off for my 307, If your 305 is 84 and Later I wouldn't mind the heads.  If you build the 305 for budjet they can be fun but it will leave you looking at how much you spent going I coulda got a crate for that and saved alot of head aches.  The cams usually really suck and for the 700 dollars for a 335 kit you can probably find a good used 350 or larger with as much power in stock trim and build it in time.  But if you want to build the 305 I would start with a pocket port a good cam headers fairly small ones intake I like the rpm, and good ignition.  If you don't want to pull the pan you can achieve similar results to the cam swap with longer rocker arms though it's kinda fun to get in there and feel like youve really done something in the end.  Look up casting #'s on every thing before purchase, some one almost swindeled me into a 262 powered camaro last month and all I wanted was the motor.  I personnaly like 327's over the 350 unless a newer vortech or LS 350 which are out of buget for me.  

A 305 has a bore much closer to a 265 (3.74 vs 3.75) than anything else. A 327 requires a bore of 4 inches, the boring bar will hit water way before that dimension with a 305 block.

The 305 also shares the 350's stroke of 3.48 inches, however, it isn't a 350 crank, attempting to swap 305 and 350 cranks will get you into big time problems with balance.

The 307, which has been mentioned a couple times in responses, uses a 3.87 inch bore same as the 283. It uses a 3.25 inch stroke same as 327. Taking these blocks to a 4 inch bore is right on the edge, however, some 307 and 283 blocks will safely accept a 4 inch bore (.130 inch over), especially older blocks which tend to have more beef in the cylinder walls. The wall thickness should be sonic checked before doing this as a little core shift will cause big problems.

But quite frankly, given the number of used 350 blocks out there and /or reasonably priced rebuilt or new GM Goodwrench long blocks and crate engines, I have to say that trying to build a 327, a long obsolete engine, is throwing good money after bad. The fiddling around with this will cost as much or more than just getting a decent 350 and offers no technical advantage.

Bogie

the last time i checked you could get a brand new 4 bolt main block from gmpp for somewhere in the $350-450 range,  which would be about the same as the machine work you will be putting into the old "seasoned" block. 

Here is my 0.02 for what it is worth.  My first car was a 1984 Camaro Z-28 w/ a 305 H.O. (L-69) and a 5-speed.  This was the fastest production Camaro in 1984 and while by today's standards it is a huge performance turd, it is my huge turd.  It is all original w/ 88 K on the odometer and has never been repainted and the only rust is under the lip of the hood (damned Indiana weather)...not too bad for a 22 year old car.  I have often thought about trying to keep the car all original but wanted a little more grunt out of it.  The 335 stroker kit is definitely the way to go if you have a car that you care about and want to keep it all #'s matching.  This will produce a little over 300 HP and really good torque in a very reliable street small block.  However, if it is performance on a budget that you are after, then go w/ a 350 or 383 and you will be much happier if you don't care to keep the car original.  The 305 from the factory in the Camaros was a good little street motor.  Torque in all the right places when mixed w/ the 5-speed.  However, it will never be anything to tear up the drag strip...runs out of breath on the top end.  If you are wanting street strip, don't build the 305.  If you want to keep the car original and a bit of a sleeper to stomp on Mustangs, go for it.  I can pull my untouched '84 Z-28 out of the garage today and still waste all of the new Mustangs in a stop light war with the exception of the Cobra.  The GT's are no problem.  With the 335 and a decent cam, intake, and exhaust you should toast the Cobras as well up to about 70 mph!  Good luck.

there's nothing wrong with a small bore motor. it's the total packager that makes the power. the new LS1 motors from gm only have about 3.8 inch bore and there smoking alot double hump headed 350's out there. if your going to biuld a motor you need to know what you want to build. if your going to drag race i wouldn't go any smaller than a 400. if your going to drive it everyday. a mild 350 will do. as much as technology has advanced there still is no replacement for displacement

ok, i too have the same L69 motor that i (in a younger stupor) bought for $500 bones few years back.  here are the "spex"  '84 305 H.O. L69  +.030 with unknown mild cam.  i put in a Performer RPM #7101 intake, #1406 edelbrock carb, hedman hedders 1 5/8" and had some A/C guy mock up a dual snorkel airfilter cover for my k&n.  that's it really...at this present date, i'm not sure when i'll build a 350.  i hear all the time and i have accepted to not do any real build up on this 305 motor.....HOWEVER, i'm wanting to waken it up just a tad...i had in mind a performance carb kit for the #1406,  3.73 rear gear (oh, by the way, the 305 sits in a 1/2 C-10 swb '86 silverado) and true dual the exhaust with X pipe.  i decided on this because i can use the carb, gear and exhaust on a 350 in the future.  also, i have been thinking of getting the summit brand 1.6 roller tip rockers ($100) and a slew of new gaskets, bolts/studs and valve covers.  (and maybe clean the motor)    should i even buy the rockers?  they should work huh?  thanks for ya'lls input.  i hope i can make something out of this motor except some more oil stains on the new drive!!  i'll be back later...  joey from anahuac, texas!  

bump..any insight on this topic anyone???  

nitrous  

if u dont have the funds 4 an crate motor i would use the 305 as an core on a 350 or an 400 by the way nice truck!!!!!!!!!!!!when u get a 350 block u may want to check on the back issue where chp turns a 350 into an 327 using an 307 crank as far as an 307 crank either check at a junk yard or p.a.w