Did GM ever add mallory from the factory for a too light crank??? - Team Camaro Tech
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post #1 of 8 (permalink) Old Mar 19th, 08, 07:11 PM Thread Starter
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Did GM ever add mallory from the factory for a too light crank???

My 454 is becoming a fun mystery to figure out as I keep pulling it apart. Outside appearance was bone-***- stock. Speedo reads over 100K ('73 3/4 2wd). Holes are in super-looking shape. Cam looks stock or off brand (end is not stamped). Lift is a monsterous .391. Bore is still 4.250. Pistons are cast. Stock timing chain was soooo loose that I could touch the side of the casting for the timing chain bolts (probably varying 7-8 degrees just by lifting and stomping the gas)................

The crank, however, has 2 holes drilled on the rear counter weight and there is a chunk of mallory added to it as well. Crank is still in but I pulled one main and it's a .012 bearing. Wouldn't factory be STD?? Also, all the rods are stamped 1-1, 2-2, 3-3, ect. Isn't this the mark of a machine shop??? Did GM stamp their new rods for the holes they went into??? There also seems to be a little extra weight tacked onto the flexplate next to the original external balancing weight. Do you think someone would have just cleaned and turned the crank, if they lost a bearing, balanced it and did not thing else to the motor??? This thing is going to rock when I get done with it!!!!!


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post #2 of 8 (permalink) Old Mar 19th, 08, 07:32 PM
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Re: Did GM ever add mallory from the factory for a too light crank???

Factory would be STD or 009 stamped on the back of the bearing shell. GM did not number the rods nor added extra weight to flexplate nor add Malloy metal.

Some PO may have had the crank replaced at one time.

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post #3 of 8 (permalink) Old Mar 19th, 08, 08:21 PM
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Re: Did GM ever add mallory from the factory for a too light crank???

Quote:
Originally Posted by dubs68camaro View Post
Lift is a monsterous .391. :
Is this lobe lift, or valve lift ?? If the cam lobe lift is .391, the valve lift is .664, definitely not stock. I think the old stock cams were around .400 valve lift though.


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Originally Posted by dubs68camaro View Post
The crank, however, has 2 holes drilled on the rear counter weight and there is a chunk of mallory added to it as well. ......There also seems to be a little extra weight tacked onto the flexplate next to the original external balancing weight.
This stuff all seems to be unusual, unless it is a stroker crank of some sort, or some one did a "backyard" balance job. Did you happen to measure the stroke while one of the pistons was still in ?

Bill Koustenis
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1971 Chevelle "Heavy Chevy" original owner


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post #4 of 8 (permalink) Old Mar 19th, 08, 09:55 PM Thread Starter
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Re: Did GM ever add mallory from the factory for a too light crank???

Actually, what I did was take the base circle of 1.37 and subtract it from the overall lobe height of 1.60 to get .23, then I X it by the rocker ratio of 1.7 to get the true lift of .391.

I didn't measure the stroke because it's a factory 7416 heavy duty forged BBC crank.


......back now and it's 4.00 stroke. You had me there for a minute.

Can't wait to hear it purrrrr with the "harold" recommended 272h with .515 lift. Actually, PDQ can take a little credit too....he brought up the specs to start with and Mr. UD confirmed. ;o)


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post #5 of 8 (permalink) Old Mar 20th, 08, 06:44 PM
 
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Re: Did GM ever add mallory from the factory for a too light crank???

Thanks,

UDHarold is the MAN!!

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post #6 of 8 (permalink) Old Mar 20th, 08, 07:39 PM
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Re: Did GM ever add mallory from the factory for a too light crank???

How do you know is mallory? Is it welded on end or into the side of the counter weight?

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post #7 of 8 (permalink) Old Mar 20th, 08, 09:01 PM Thread Starter
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Re: Did GM ever add mallory from the factory for a too light crank???

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Originally Posted by zdld17 View Post
How do you know is mallory? Is it welded on end or into the side of the counter weight?
It's mallory and it was used to fill one of the holes that was originally drilled into the counter weight. It lools like sodder. It's definately a balance job.


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post #8 of 8 (permalink) Old Mar 21st, 08, 09:29 AM
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Re: Did GM ever add mallory from the factory for a too light crank???

Ok, I have heard of this happening when using too light of a crank , like the aftermarkets ultralight 43-45# sbc cranks, but never in stock application, If it welded, then as you say, its balanced . Someone had their hands in it, but why in a pickup?

Don
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