Thread: 265 crank in a 283 block with 327 heads

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I was recently at a car show and someone told me that back in the 60’s and 70’s an old trick was to take a 283 block with a 265 crank the high performance 327 heads he said that it would run at around 10 thousand rpm and push out an easy 375-400hp when built right. This makes sense to me (apart from the 10,000rpm) He did say that these engines did not last long but you can also find a lot of 283’s and 327’s in junk yards so I am thinking of trying it. I was wondering if anyone has ever done this or heard of it being done.

I think the only difference in a 265 and a 283 is the bore, believe the stroke is the same..... If I'm wrong I'm sure the chebbie guys will correct me. As for the 10,000 RPM, they might hit it a few times but not many. A lot of the alleged 10,000 RPM engines were probably done at 7500 to 8000. Doubt seriously if a junkyard block and 327 heads would do the 10,000 RPM without a lot of valve train upgrades.

I would not believe anything that person said. 283's and 265's shared the same crankshaft. Adding 327 heads would improved upper rpm power if they were appropriately modified, but no way in h*ll did anybody turn them to 10,000 rpm. Either the guy has a serious lack of knowledge or he is what I like to refer to as a "bench racing bullsh*tter." We've all run into these types before. And I certainly would not buy any parts from him.

They will go 10,000-but not with anything in the engine that was stock. Forged crank- good valvetrain-good heads and intake. The crank was the biggest thing,they were the weakest link.

Now there is a way to get that stock motor to 10,000 rpm without even touching it. It has to have a standard trans., just hook it to another truck with a chain, leave the trans in first gear and start pulling it down the road. Get it up to about 80 MPH and it will be turning around 10K in first gear.