Saint27

I have an '85 Camaro with a 305 that is acting like it is on its way out. Blow smoke on the start-up and all kinds of other things. I guess it should be excepted with 127,000 miles on it. I want to keep the original block and heads, but try and turn it into a 350. Any sugestions? Thanks for any help.

Chris

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Give me a place to stand and I will move the Earth
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firechicken_3

can't be done, i went round and round with people on this board, you just cannot turn a 305 block into a 350 block, i forget the exact differences, but the guys here gave me proof that they were right,

you'll need to find a 350, in another vehicle, or at a junk yard, wherever you can. you could use the heads from the 305 over, but they will hurt performance, they actually even restrict the ariflow on a 305, once you put a decent cam in it

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84' Firebird, 305ci lg4, 700R4, 288/292 duration .450/.460 lift,Edelbrock Performer intake, Holley 600cfm 4 barrel, K&N filter, Pacesetter Headers, 3'single exhuast, dual out muffler, no cat,Motive 3.73's and Auburn Posi
1/4mile 15.17sec @ 92.5mph

currently in pieces, for manual swap

Jim85IROC

The proof is that the 350 has a .25" larger bore diameter, and you can only bore the block .060 maximum. If you go any bigger, the cylinder walls will be way too thin. If you tried to go the full .25 you'd probably bore all the way into the water jacket.

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The IROC Homepage
View the Restoration of an 85 IROC
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aklim

If you are lucky that is. If not, it could leave your walls paper thin and when you start up the engine.....

Why keep the block? 4 bolt main 350 blocks are plentiful?

firechicken_3

there is one way that you could do it

bore it to the max, and then stroke it to the max

i have no idea what stroker cranks are available for a 305, this would be a neat alternative if it could be done, however VERY expensive, not to mention for the money, you could build a 383, or 400+ if you did it to a 350, or 400 block

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84' Firebird, 305ci lg4, 700R4, 288/292 duration .450/.460 lift,Edelbrock Performer intake, Holley 600cfm 4 barrel, K&N filter, Pacesetter Headers, 3'single exhuast, dual out muffler, no cat,Motive 3.73's and Auburn Posi
1/4mile 15.17sec @ 92.5mph

currently in pieces, for manual swap

camaro85

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speed is a question of money how fast do you want to go

bcirocz

The only other engine that has been more produced than a 5.0L/305 is the 5.7/350 man you could find one at a scrapyard or Pick your part for 130 bucks Canadian...Theres your block get it completely redone and even if it came outta a van or truck you have your block the rest of the engine you can buy and the parts can be as high performance as you need em its just a matter of how much money you wanna spend. Dont waste your time trying to bore and stroke the 305 itll just give you way too many severely complicated problems and you may just end up having to buy a new engine anyways.

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Remember to free up your time around June 22 2003 and bring your Camaros to the Peach City Beach Cruise.(Plenty of classic and muscle will be there lets bring the Camaro contingent). For more information see www.peachcitybeachcruise.com .

1989 Iroc Z28 305 TBI
100% Stock (For Now)

Jim85IROC

The bore/stroke ratio of the 305 already sucks. Put a 400 crank into it and bore it .030 and you've got somewhere around a 334. To get 350 cubic inches out of it you'd need a MASSIVE crank and you'd wind up with a $10,000 motor with a bore/stroke ratio so bad that it can't suck enough air in to support RPM over 5,000.



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The IROC Homepage
View the Restoration of an 85 IROC
Weekend projects aren't.

1FastIroc87

I beg to differ, on this one. There isa place called Powerhouse in Cal. That makes a stroker kit for a 305. It would not be a 350 but you pretty much use everything like the crank rods and so on. Just look them up on the internet. I dont know thw web address but ill try to find it. Chevy high performance or Super Chevy did on of the engines it came out to be a 335 with 305hp at 300 foot pounds of tourqe. Yea what till the next time you see a 4th gen with 285hp and you blow his doors off. You can email me a whinton@excite if you want to know more.

firechicken_3

[/b][/QUOTE]The bore/stroke ratio of the 305 already sucks. Put a 400 crank into it and bore it .030 and you've got somewhere around a 334. To get 350 cubic inches out of it you'd need a MASSIVE crank and you'd wind up with a $10,000 motor with a bore/stroke ratio so bad that it can't suck enough air in to support RPM over 5,000.[/QUOTE]

you gotta admit though, it would be unique if you had the money, andit would prolly make tons of power, up to 5000, if that is really where it drops off

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84' Firebird, 305ci lg4, 700R4, 288/292 duration .450/.460 lift,Edelbrock Performer intake, Holley 600cfm 4 barrel, K&N filter, Pacesetter Headers, 3'single exhuast, dual out muffler, no cat,Motive 3.73's and Auburn Posi
1/4mile 15.17sec @ 92.5mph

currently in pieces, for manual swap

[This message has been edited by firechicken_3 (edited August 16, 2002).]

Perry93TransAm

The bad part is that even after you get all machining done to make it a 335 to 340 (.060 with a 3.75 stoke) youd stil have to have the block clearanced just to put a good set of heads on it. If the valves were kept in the 1.94 (int) size youd be OK but after that anywhere over 480 lift and the 2.00 and 2.02 valves hit the block. This is a neat motor though, and it produced gobs of torque under a TPI set-up.
Perry

Kevin91Z

Yah, and the Tornado and Slick 50 is for sale too. Are those great products? Just because someone offers a part, doesnt mean it a good part. Who cares what Super Chevy got with their stroked 305. Those arent very good numbers, anyway. Is that at the crank or the rear wheels? Just think about how much more power they'd have with those parts on a 350.


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1991 Camaro Z28
350 L98 w/ T56 (originally 305 LB9 w/ T5)
318 RWHP, 419 RWTQ
12.803 @ 108.50 MPH (1.932 60')
Member: SoCal F-Bodies
ThirdGen 4-Life!

Gear Breath

Ok, this is possible, but silly.

You can bore the 305 block and sleve it, and have a 350 (the stroke is the same). However, sleves are about $80.00 per hole, the 305 block isn't as strong as the 350, You'll need new pistons and rods, cam, bearings, etc, etc.,

Also, whoever saw the story on a stroker 305, how can you do a stroker and use the stock crank? You are contradicting yourself on that one. Besides, it will still cost more than just buying a 350 rebuilt, and put out about the same power.

Toss the 305 and either junkyard or buy somebody's rebuilt 350. Put a small cam in it and you will be a happy boy. It will be cheaper and more durable.