3rd Gen / L98 Engine Tech 1982 - 1992 Engine Related

Overhauling the 305 :)

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Old Oct 7, 2004 | 08:32 PM
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Overhauling the 305 :)

Ok.. so, I have decided that, seeing as though putting on new rings would make me lifte the engine out of the car, and also call for new crank bearings, etc, I am going to just pull the engine, and redo EVERYTHING that needs to be done. Only this time around, the Chevy Power will be Hi-Perf EVERYTHING
So.. what am I going to need?
Old Oct 7, 2004 | 08:50 PM
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Re: Overhauling the 305 :)

Originally Posted by 85_305
So.. what am I going to need?
a 350 block,forged internals,AFR heads,big Comp Cam...

u just want to rebuild the 305 w/ stock stuff or what? u gotta give us an idea of what u wanna do man.
Old Oct 7, 2004 | 08:51 PM
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Re: Overhauling the 305 :)

Screw the rebuild.....just swap in an LS1
Old Oct 7, 2004 | 09:13 PM
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Re: Overhauling the 305 :)

LOL.. I could only WISH that an LS1 was an option *jelous stair*
BUT.. I am going hi-perf. everything. I have my heart set on a cam, gaskets I can take care of, but everything else I need help w/. Such as which rockers, crank bearings, etc..
Thanx all!
Old Oct 9, 2004 | 07:30 AM
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Re: Overhauling the 305 :)

Originally Posted by Rice Killer87
a 350 block,forged internals,AFR heads,big Comp Cam...

u just want to rebuild the 305 w/ stock stuff or what? u gotta give us an idea of what u wanna do man.
If you are doing a complete rebuild, go get a 350 engine from a scrap yard or where ever and rebuild it. The cost will be the same as the 305 but when you are done you will be much happier and much more potential down the road for further HP increase.

Unless your car is so perfectly original and you want to keep it that way.

Picking up a 350 will be very cheap. I picked one up for $100 with tranny and did an economical rebuild and pulled the tired 305 out of my 85 1/2 ton and put the 350 in.
Old Oct 9, 2004 | 08:14 AM
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Re: Overhauling the 305 :)

If you are going to re-do the whole bottom end, I suppose you could come on over to Michigan and buy my 305. I might sell it, since I'll be swapping in a new motor this winter. This L69 305 makes 262 RWHP and still burns NO OIL, and has plenty of go-fast parts on it. $900 for the whole thing, and it'll push your car to 97 MPH, maybe higher in the traps. I've done 101 and have video to prove it.
Old Oct 10, 2004 | 10:35 AM
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Re: Overhauling the 305 :)

Hmm.. I will keep that in mind ws6transam! What kind of torque is it pushing? The reason I am doing MY 305 is because I want to see if I have what it takes to make a beastly engine almost by myself; a beastly 305 to be exact
Old Oct 10, 2004 | 12:13 PM
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Re: Overhauling the 305 :)

i don't see why everyone has to put down the 305? for what it was meant to do i think it performs fairly well. why not a 350?

why not a 383 storker?
why not a 396 stroker?
why not a 454 BB?
why not a 502?
why not a 572?
why not a 572 with TT and a 500 shot of spray?

some people like to use what they got, i myself want to take my 305 apart and see how much low end torque i can push out of it. yes the 305 and 350 are exactly the same block but if he wanted to use a 350 he would have said so in the begining. not everyone wants to be the fastest third gen on the boards, so from now on can people stop saying '350 swap' as an actual mod to the 305?
Old Oct 10, 2004 | 12:43 PM
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Re: Overhauling the 305 :)

"so from now on can people stop saying '350 swap' as an actual mod to the 305?"

No, that's too hard guys with inferiority complexes to do. (Or those who have a 350 and were beat by a 305.)
Old Oct 10, 2004 | 12:48 PM
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Re: Overhauling the 305 :)

Originally Posted by 92RS305#2
some people like to use what they got, i myself want to take my 305 apart and see how much low end torque i can push out of it.
.
.
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not everyone wants to be the fastest third gen on the boards, so from now on can people stop saying '350 swap' as an actual mod to the 305?
Exactly the point. It's about seeing for ones self. A 305 in your engine bay is a known quantity. It's there, and it's paid for. What a perfect starting point to gain knowledge about performance building a smallblock Chevy!

Personally, when I built my 305, it was a learning excercise to learn the basics of engine building. I didn't want to jump into a big engine project without allowing for some mistakes. The 305 seemed to be a good place to start. I went in with the idea that if I found something drastically wrong (like scored cylinder walls that necessitated a piston swap and overbore) I would just push the pieces to the side and trade up. However, I didn't find anything wrong (no measureable wear on any cylinder), so my learner engine started out with a NET ZERO cost for the shortblock reconditioning. I was able to spend the extra money on cams, intakes, cylinder heads, die grinders, porting kits, books, cam installation tools, etcetera.

Then there's the troublesome issue of how we've evolved into a throwaway society:
Something still feels "wrong" with just tossing a perfectly good engine onto the junk heap.

p.s. The dyno specifications from the Mustang chassis dyno for my engine, as done on 10/16/2003, were: Peak power of 262.2 RWHP at 5520 RPM (my Crane HI-6 was disconnected) and Peak torque of 284.0 ft.lbs at 4370 RPM. The torque is above 275 ft.lbs from 3500 RPM to 4900 RPM. I think that my spark was going away beyond 4900 because of my 137,000 mile old distributor, and the fact that my Hi-6 wasn't plugged in.

This is torque and horsepower as measured at the rear wheels. Multiply the numbers by 1.17 if you want approximate flywheel numbers. With a new ignition, I think there's another 17 RWHP in this engine from 5000 to 6000 RPM.

Last edited by ws6transam; Oct 10, 2004 at 01:04 PM.
Old Oct 10, 2004 | 01:04 PM
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Re: Overhauling the 305 :)

Originally Posted by Rice Killer87
a 350 block,forged internals,AFR heads,big Comp Cam...
Why should he do that when he can just bore it out and make it a 350, better yet while he is at it he should make it a 400.



Yes I am joking
Old Oct 10, 2004 | 03:24 PM
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Re: Overhauling the 305 :)

Well for those people that say why a 350, what do you think you could practically place in a third gen engine well and mounts? I am not arguing, I am just unexperienced and would like to know if I could stick a 454 in there if I want to or at least a stokred 383.
Old Oct 10, 2004 | 03:36 PM
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Re: Overhauling the 305 :)

i don't see why everyone has to put down the 305?

They do until they see my results. Then it's a different "attitude" about 305s altogether....
Old Oct 10, 2004 | 06:09 PM
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Re: Overhauling the 305 :)

We all know what the 305 is capable of. It is just that most of the time more displacement is a cheaper route. You have what about 4k into the motor and supercharger on that car? For that money you can get a 350 or 400 with just as much or more power and have a NA motor. Then when you save up the three grand for a supercharger it will put your 305 to shame.
But then again a setup like that will never pass emissions.
Old Oct 10, 2004 | 06:24 PM
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Re: Overhauling the 305 :)

as far as i know a chevy small block is a chevy small block, right? a 383 stroker is a 350 small block bored and stroked. a 454 is a BigBlock chevy motor and so is they're 502/572. is the 454/502/572 all the same size block like a 305/350 is?

and thankx you 305 guys for sticking up for us, i just see the little small block get put down too much. its like the 427 is always passed up for the 454 as was the 327 was passed up for the 350 back in the 60s.



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