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Topic Review (Newest First)
11-11-2012 07:43 PM
birkey Will there be a possibility of having cooling issues with such a thin cylinder wall?
11-11-2012 03:37 PM
CNC BLOCKS NE
Quote:
Originally Posted by ap72 View Post
a stock cast crank is usable past 7,000 rpm, BUT you need to properly machine and build your engine and use the lightest rod/piston assembly you can.

Losing weight on your rotating assembly goes a LONG way when you start going into higher RPM. The same holds true for your valve train.
I have seen plenty of broken cast cranks in 375 horse circle track engines over the years that turn up to 6000 RPM.
11-11-2012 02:30 PM
ap72
Quote:
Originally Posted by birkey View Post
The crankshaft is forged instead of nodular iron. How much stronger is forged
a stock cast crank is usable past 7,000 rpm, BUT you need to properly machine and build your engine and use the lightest rod/piston assembly you can.

Losing weight on your rotating assembly goes a LONG way when you start going into higher RPM. The same holds true for your valve train.
11-11-2012 02:24 PM
tresi
Quote:
Originally Posted by birkey View Post
The crankshaft is forged instead of nodular iron. How much stronger is forged
If it is a stock forged crank it's only a little better than a good cast crank. The stock forging didn't wear very well. An aftermarket forging is a totally different story. At least that my opinion which is probably worth what you paid for it.
11-11-2012 12:41 PM
birkey Just trying to get some info on a new motor. I'm just out of college and have MANY questions.
11-11-2012 12:39 PM
cobalt327
Quote:
Originally Posted by birkey View Post
The crankshaft is forged instead of nodular iron. How much stronger is forged
Considering the quality of the steel used in the factory forgings isn't the best and that the journals are smaller than a LJ cast crank, it's prolly close to a wash between a forged SJ and cast LJ crank. If you were comparing the same size journals, then the forged crank would be stronger than a cast crank.
11-11-2012 12:35 PM
vinniekq2 birkey,whats the purpose of your question(s)
11-11-2012 12:32 PM
birkey The crankshaft is forged instead of nodular iron. How much stronger is forged
11-11-2012 12:13 PM
1Gary
Quote:
Originally Posted by cobalt327 View Post
There was never a factory 283 that was anything but SJ crank/rods.
Yeah,your bringing back some of those memories.Your right.
11-11-2012 11:31 AM
CNC BLOCKS NE
Quote:
Originally Posted by vinniekq2 View Post
1968 the 327 was either small journal steel or large journal cast.
I have seen 2 cast 283 cranks which are very rare and seen plenty of the large journal steel 327 cranks over the years.
11-11-2012 11:02 AM
cobalt327 Unless something was dropped on it it should be OK. We used to hang cranks using fan belts, had a hired hand who unbeknownst to us took them all down and laid them on the floor while doing repair on a window. It wasn't caught for several weeks, but the cranks were fine. These were all SJ steel cranks, LJ cranks hadn't come out yet. But checking ANY crank for straightness and cracks should be the normal routine anyway.
11-11-2012 10:57 AM
vinniekq2 I dont see why not? crank straightening used to be an art
11-11-2012 10:42 AM
birkey the guy i got it from had the crankshaft laying on its side for sometime, can i check the warp with a dial indicator and the crank laying in block.
11-11-2012 10:38 AM
cobalt327
Quote:
Originally Posted by vinniekq2 View Post
1968 the 327 was either small journal steel or large journal cast.
It sure was. That was the year things changed over. Like the LWP front accessory dress for cars.
11-11-2012 10:35 AM
vinniekq2 1968 the 327 was either small journal steel or large journal cast.
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