Thanks.

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Love you Camaro, love your wife/girlfriend, BUT ALWAYS PUT GOD FIRST!!!

1991 LO3 305 RS Camaro w/Headman headers and custom dual exaust.

 

ya they will but its kindof a pain the 350s crank has more heavy metal in it(to balance the larger pistons) The rods shouldnt be a problem (not sure on these) But i am sure that the cranks may look the same on the inside they are different.

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Ya sure it is just an RS

B4Cyaa

1991 RS B4C
Former Nebraska Highway Patrol Car
305 TPI
WC T-5
Four Wheel Disk Brakes
Only Options
Rear Defrost
Am-Fm Radio
Red-int White-exe
One BA Of A 350 In The Works
Mods
Dynomax Cat Back (to hold me over till I got the $$$ for the Borla)
best 1/4mile Run of 14.92@94.83
with 145,000 on her
god speed dale

 

oh ya you could probley get a new 350 crank for under 275$ if you rebalanced and turned a 305s crank you would probley spend more then the new crank.
good luck man

jacob

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Ya sure it is just an RS

B4Cyaa

1991 RS B4C
Former Nebraska Highway Patrol Car
305 TPI
WC T-5
Four Wheel Disk Brakes
Only Options
Rear Defrost
Am-Fm Radio
Red-int White-exe
One BA Of A 350 In The Works
Mods
Dynomax Cat Back (to hold me over till I got the $$$ for the Borla)
best 1/4mile Run of 14.92@94.83
with 145,000 on her
god speed dale

 

You would have to add weight to the crank to get it to balance the larger pistons. That is an expensive job. Cheaper to buy a 350 crank.

 

It was my imression that the 305 cranks were of a lighter contruction. The rotating mass of a 305 is of lighter construction to save energy lose and improve gas mailage. I just picked up a 350 crank for $125 from my local machine shop. Its just a cast crank, but I would feel safer with it, then a 305 crank.

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1992 Pontiac Firebird 350/Six Speed
1987 Toyota Pickup 383/500+ HP

 

Thanks guys. I figured that is what yall would say but I went ahead and asked. Yeah i probally would go ahead and get 350 crank but i may go a head and use the 305 rods if i have to. Does anyone know what stock rods are rated to run to with out danger of throwing one? Thanks again!

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Love you Camaro, love your wife/girlfriend, BUT ALWAYS PUT GOD FIRST!!!

1991 LO3 305 RS Camaro w/Headman headers and custom dual exaust.

 

You dont want 305 rods. Someone made a post before, I think on the tech/general engine board, with a pic showing the difference, and the 305 rod is considerably smaller.

 

You're right, madmax...and here it is:
<center>
The 350 rod is on top
</center>

Pete

------------------------------

Pete's Place
HiOutput Tech Page

<a href="http://www.hioutput.com/pete/garage/83SC/83sc.html" TARGET=_blank><IMG SRC="http://www.hioutput.com/pics/SC.gif" TITLE="Pete's 83 SC" border="1"></a>
My 83 SC...(originally V6) 206,500 mile LG4/5-speed from an 84 Z28, 3.42 one-tire-fryer, T-tops, PW, PH, boxed LCA's, Hedman Hedders and y-pipe, Dynomax cat-back, .420" lift cam, custom air induction .....best ET is 14.935@94.14</P>

</P>Success means you got up one more time than you fell....

 

Not all 305 rods are like that....

My 83 L69 came with X rods.

The 305 and 350 crank are the same casting (usually 442), same stroke and everything. The 267 even uses that same casting. They are balanced slightly differently in the case of 305s that use the weenie rods. A 305 crank that came with real rods should be the same balance as a 350 one. Heavy metal is not used by the factory in balancing cranks; they just make the counterweights too big and then drill holes in them to get them right.

Cranks are not balanced to the pistons, since the pistons don't rotate. They're balanced primarily to the big end of the rod; since the rest of the mass of the rod "rotates" progressively les and less as it approaches the small end, all that has relatively little effect on the balance. All you have to do with pistons is make sure they're all the same mass, since an equal number of them is going up as are going down at any given instant.

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"So many Mustangs, so little time..."
ICON Motorsports

 

the 305 and 350 cranks were the same castings but they were balanced different like mentioned earlier.

as far as the rods i have always heard that 305 rods were lighter and generally stronger than 350 rods.

 

think that the main bearing journals are slightly different sizes from 305 to 350

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Scott Downs
85 Trans Am
305 tpi/700r4
3.73 w/275/60R15
plain firebird nose(for better engine cooling)

 

The bearing journals are the same.