Is this possible I heard from a friend that if you do this you can rev higher on the engine. This may be a stupid question but I have never heard of this anyone know any benefits? what kind of cubic inches is this? AM I just freaking retarded for thinking about this at all?

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95 Formula Hurst 6 speed, c.a.i., Lt4 knock sensor, flowmaster, TPS airoil, 13.6 on street tires

 

No. The 350 and 305 use the same crank.

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1983 Monte Carlo, 307 Stroker, TH350, 3.73 10-Bolt - SOLD 8/19/02

Future F-Body Owner

[This message has been edited by BlackHawk T/A (edited August 26, 2002).]

 

Yup, 305 just has a smaller bore

maybe he was thinking 302

 

Sorry, not correct. The 305 crank has the same stroke and bearing journal diameters as a 350 but the balancing is different. The small bore 305 has significantly lighter pistons and so GM puts less weight in the 305 crank's counterweights. There are actually differences you can see with your eye in the counterweights if you lay a 350 and a 305 crank next to eachother. You'd have to rebalance it and I suspect that would require adding (expensive) Mallory metal to get the counterbalance weight high enough to zero it out.

 

It is pointless to do this. The 305 crank is spindly and can not withstand the power a 350 puts out. ANY competent engine builder will tell you not to do it.

Ryan

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1994 Z28 A4, Vortech, Borla with EBorla, TPIS 52 mm TB, Hooker shorties, Electromotive SDI, LS1 brakes, AAM 3.42 rear, more.

 

well i didn't mean they were the same exactly...i just meant the stroke is the same. i am correct on that one aren't i?

thats all i meant, but that is interesting about the 305 crank. didn't know that

thanks

 

You could try the 265 ci L-99 crank (3.00) stroke and make a 302 ci motor.
You will also have to invest in more gear to make it work!!

Daren

 

Same here, I was only talking about stroke length.

They both use a 3.48" stroke crankshaft.

305 = 3.735 x 3.480
350 = 4.000 x 3.480

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1983 Monte Carlo, 307 Stroker, TH350, 3.73 10-Bolt - SOLD 8/19/02

Future F-Body Owner

 

Thanks for setting me straight I will look into that 265 crank....

 

The 265 and 283 use the same size crank.

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1983 Monte Carlo, 307 Stroker, TH350, 3.73 10-Bolt - SOLD 8/19/02

Future F-Body Owner

 

Why exactly do you want to do this though? High RPM actually starts costing you $, since the parts will be under a bit of abuse, plus if you plan on over 7k RPM which it sounds like is the plan then your going to need an aftermarket computer (I assume this is an LT1? If not ignore).

Still though, why build an 8500-9000 RPM engine? Your going to sacrafice low end for top end, and again the accelerated bearing etc wear, doesn't make it attractive for most of us. This is something the 4 cylinder guys are mostly forced into doing, since they lack the cubes of a V8.

More cubes = cheaper and easier HP.