Black363IROCZ

I was looking for a test motor for a dirt car and I came upon the idea of a 305 with a 283 crank for high revs. would it fit?

mw66nova

iTrader: (13)

a 305 with a 283 crank is a 283. the bores are the same. although i don't think it will work cause the journals are smaller on the 283.

Black363IROCZ

I calculated it out to a 267... not a 283.
a 307 with a 283 crank is a 283... what about a large journal 302 crank? would that work? just tossing around ideas here

dans82bird

it would work, but why dont you build up a 302 or 327 instead of a 283?

mw66nova

iTrader: (13)

sounds like a little bitty motor that wouldn't be worth a dang. chevy had a 267 or something like that and it didn't last long. if ya want a high revving motor, build a 302, 327, or even a 377. those would be your best bet.

Black363IROCZ

just experimenting really. it's gonna be a junkyard build.

chevypower

267 is a **** of a motor but it will take heads like a 350, 327, 302 and etc( 202 intake & 160 exhaust). Unlike our 305's so whats the real **** motor everyone has there own idea.
283 rock if you ask me. I had a origanal 283 Power Pac in my '84 F41 Camaro after the HO died. *** 7000rpm came like nothing(no real high speed power). **** its a classic in my book. Hell it was even the Vetts claim to fame at one time. I wound it up one time too many though(it was build in a back yard in the dirt). The 262(is'ant this the smallest V8 Chevy Built?) that replaced it was nothing, it was a high rever to though just no power, it show sounded like you was moving though. I say use a 283 crank and a 327 block that shoulid give you what 302ci?

mw66nova

iTrader: (13)

not quite, a 302 is a 350/327 block with a 307 crank.

Black363IROCZ

nope, a 302 always has been a 4" bore x a 3" stroke. that would be a 327/350 block with a 283 crank. 307 isn't a 3" stroke, it's a 3.25" stroke. anyways, I just wanted to know if it's fit or it there were like bearing spacers to make this motor work. It's a dirt cheap experiment, just wanna see what it'll do. parts matched I'm sure it wouldn't be bad at all. if you bore a 305 .060 over would you be able to run 2.02"/1.62" int/exh valves or are you still stuck at 1.94/1.50 valves? I think a solid cammed 3" stroke 271 with vortec heads and 11:1 compression would be pretty wicked. the only problem is finding high compression 305 pistons. anyone know if they make an 11:1 305 (.060" over) piston? best I've found is a 10.4:1 with 64cc heads.
I'm not looking for alternatives btw, I just wanna know if there are any 3" stroke cranks for large journal motors. preferably 1 piece main seal

ede

283 crank is SJ 305 blocks are LJ so it isn't going to work

SSC

Sigh........... even if it were a high rev engine what are you going to put it in, a rail? GM made production 267's 4.4L they sucked, same stroke as a 305/350 same ballancer as a 305 and less power. Weird combo's dont usually work out well especially since thier are more potent choices that dont need to be altered to run well.

If you were to bore the 305 out and use 2.02 intake valves it might have to be notched. A 60 overbore comes close to fitting the larger valves but I just dont think it'll clear completely. As far as pistons for the 305 call local machine shops. They still have sources that are not avalible online and can get the parts you want.

Jim85IROC

iTrader: (2)

big valves will be shrouded so badly with the 305 bore that you'll most likely make less power than if you stick to smaller valves. The bore size of a 305 sucks and there's absolutely no advantage nor reason for restricting yourself with it.

Air_Adam

302 is a 350/327 block with a 283 crank.

A 307 crank in a 350/327 block is a 327.

mw66nova

iTrader: (13)

sorry, i got confused, thanks for straightening me out on those numbers guys...disregard previous posts.

bigals87z28

super chevy had this whole thing on making not so good engines power houses... or at least giving people other options.
Ideas for 305's they had

267/276 ci Screamer
You need a crank out of a 265ci in 94 or the 262 crank available in 75 & 76. the 262 crank would give you the 276 ci motor.

290 ci torquer
Uses teh 307's or 327's crank in a 305. The longer stroke would make more torque then the screamer.


I think these motors have yet to be discoverd. the 267 suffers from the same fate as teh 305 as the bore is very small, but in the case above, you are using a larger bore and shorter stroke of the 267. I think the 267, 276 or 290 would make a great little street motor.