how many rpm can a stock lower end and pistons take? ive got a 2year old 350 GM crate motor that is a stock replacement type with 4 bolt mains, 1 peice rear main seal non-roller engine.

 

my friend has a stock 305 out of our cars and it handles 6,000 no prob. I would think it would have similar internals. I would say after that you are lookin to break stuff

 

About 6500 max!

 

my bro's 84 L69 305 has seen 7000 rpm many times it has sustained at least 6500. To be safe no more than 6000 sustained maybe 6500 momentarily. If you not making big power, or running a lot of camshaft lift its not quite as bad. I keep my 383 under 6000. Long stroke, plenty of power and high lift hyd roller are more likely to fail than 200 horse, shorter stroke and low lift

 

I take mine up to 6400 all the time. Its not the strongest bottom end in the world but they suit it just fine. I'd worry more about the valve float problem you'll be having at that high of an engine speed .

 

depends on if a 305 or 350.....in a 305 the max rpm for a cast stock crank is 6034 rpm.....exceeding that and your asking for touble..i spun a bearing and broke a rod because of overrevving

 

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