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Old 11-06-2010, 01:24 PM
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Retrofit Cam in OEM Roller Block

I have a 350 1 piece rear roller block out of a 94 K1500. I have a roller cam that is a retro-fit design. I am wondering if the nose of the cam could cut down to allow for the factory thrust plate to be used. If it can't be milled down what all will I need to install this camshaft. The timing gear for an OEM roller cam won't bolt to the retro-fit, so what timing set do I need? Will the timing cover really hold the cam in place using a thrust button?

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Old 11-06-2010, 03:27 PM
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The retro cam cannot be turned down. bolt circle is too large on a retro fit cam. There are timing sets for this setup. check with Melling. A roller timing setup for early blocks will work but the block has to be checked for oil plug clearance around the cam bearing.

A heavy (GM) front cover has been used with retaining button for many years. If set up correctly, there is not much lateral push on cam.
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Old 11-06-2010, 04:31 PM
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Quote:
Originally Posted by crussell85
I have a 350 1 piece rear roller block out of a 94 K1500. I have a roller cam that is a retro-fit design. I am wondering if the nose of the cam could cut down to allow for the factory thrust plate to be used. If it can't be milled down what all will I need to install this camshaft. The timing gear for an OEM roller cam won't bolt to the retro-fit, so what timing set do I need? Will the timing cover really hold the cam in place using a thrust button?
You are sort of stuck with using the old cam with a pre OEM roller timing set (Gears and Chain) and a thrust button against the timing cover. This isn't as bizarre as it sounds, the factory put standard nose, flat tappet cams into millions of truck engines that have the cast and machined provisions for the OEM roller cam using exactly this recipe without the thrust button.

You will have to check the aftermarket roller installation, the roller provisioned block has raised lifter blocks which can sometimes interfere with aftermarket roller lifter alignment bars. If you have this problem, a little grinding on the lifter block will solve the issue.

Sometimes a little extra stiffness is desired in the timing cover to react thrust button loads without deflecting the cover. The old fashion way is to weld a piece of 1/8 sheet outside the contact area, the expensive method is to buy a cast cover, my favorite is to get a water pump with the extra threaded boss on the bottom and use a locking bolt in that boss to back onto the cover so it transfers any thrust loads imposed by the cam against the cover into the water pump casting.

Bogie
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Old 11-06-2010, 07:25 PM
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Quote:
Originally Posted by oldbogie
Sometimes a little extra stiffness is desired in the timing cover to react thrust button loads without deflecting the cover. The old fashion way is to weld a piece of 1/8 sheet outside the contact area, the expensive method is to buy a cast cover, my favorite is to.................

get a water pump with the extra threaded boss on the bottom and use a locking bolt in that boss to back onto the cover so it transfers any thrust loads imposed by the cam against the cover into the water pump casting.

Bogie
Excellent!!
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Old 11-08-2010, 10:43 PM
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Another option http://www.chevytech.info/2c40o4.html to prevent Cam walk / Cover flex.
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Old 11-09-2010, 06:11 AM
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I need to buy a new water pump anyhow so does anyone know what water pump that would fit a 93 K1500 Reverse Rotation would have the boss in the water pump?
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Old 11-09-2010, 06:12 AM
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Quote:
Originally Posted by SSedan64
Another option http://www.chevytech.info/2c40o4.html to prevent Cam walk / Cover flex.
I like this suggestion and will keep it in mind
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