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Old 04-20-2011, 06:39 PM
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help with chevy roller cams, blocks....

my buddy is building a TPI 350, now he is stumped, the fac roller block is cracked in 4 places, and couldnt find another roller block so he has a TBI truck block, still tryn to go roller, ok we have found out the roller block lifter bores are .80 thousands lower than the flat tappet block, and nobody has the machines near by to do the machine work, it would be alrite if he was useing retro fit lifters but the kit for the TPI dont come with retro fit (from compcams) one of his friends seem to think grinding down the lifter guide plates would work? not me that dont sound convinseing, we did end up finding a guy to do the machine work in .Ga..... any ideas on this would be cool thanx..........

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Old 04-20-2011, 06:42 PM
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Have you looked for Vortec truck blocks?
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Old 04-20-2011, 06:56 PM
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Quote:
Originally Posted by gofastz
my buddy is building a TPI 350, now he is stumped, the fac roller block is cracked in 4 places, and couldnt find another roller block so he has a TBI truck block, still tryn to go roller, ok we have found out the roller block lifter bores are .80 thousands lower than the flat tappet block, and nobody has the machines near by to do the machine work, it would be alrite if he was useing retro fit lifters but the kit for the TPI dont come with retro fit (from compcams) one of his friends seem to think grinding down the lifter guide plates would work? not me that dont sound convinseing, we did end up finding a guy to do the machine work in .Ga..... any ideas on this would be cool thanx..........
Does the TBI block he now wants to use have any bosses for the spider and the cam retainer/thrust plate? I'm guessing not- if it doesn't have the lifter bosses machined flat for the OEM dogbone lifter retainers...

If he wants to use the OEM roller cam set-up, I'd find another block instead of using a retro cam and lifters. Otherwise, if he doesn't care what kind of roller cam- retro or OEM- then it doesn't matter. But machining the lifter bosses just to use dogbones- and the block having no other capacity to use the OEM roller cam set-up wouldn't make much sense to me.

If he's considering grinding the lifter bosses himself, by hand- forget it.
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Old 04-20-2011, 10:49 PM
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If it's a non-roller block, the center oil galley would have to be drilled and tapped for the spider also to run OEM roller stuff. I wouln't do it. Find a '96-'00 L31 5700 Vortec roller block.
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Old 04-21-2011, 04:33 PM
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thanx guys ill let my buddy know what iv learned, fixin to wast money ant the way to go..........found a vortec block but new ?'s it has a crank sensor on the front, what do you do about that sensor?????

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Old 04-21-2011, 05:45 PM
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Quote:
Originally Posted by gofastz
thanx guys ill let my buddy know what iv learned, fixin to wast money ant the way to go..........found a vortec block but new ?'s it has a crank sensor on the front, what do you do about that sensor?????
Put it on the shelf in case someone needs one in the future. Use a double roller chain like Cloyes or equivalent. You may have to do a little grinding on the face of the block behind the cam sprocket for clearance. Then use a conventional stamped steel timing cover using all available bolt holes.
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Old 04-21-2011, 05:56 PM
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Quote:
Originally Posted by gofastz
...found a vortec block but new ?'s it has a crank sensor on the front, what do you do about that sensor?????
You have a few choices:

Remove the sensor and plug the hole.
Leave the sensor in place and forget about it.
Use cover p/n12552557 w/o the sensor hole in it.

Leave the reluctor wheel that fits on the crank snout in place. It keeps the shorter Vortec damper from being installed too far- which will cause sealing, crank timing gear and accessory pulley alignment problems. Only remove the reluctor if you want to use an earlier-type damper.


VORTEC DAMPER W/RELUCTOR ON LEFT
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Old 04-22-2011, 07:18 PM
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cool, yeah the block i found is a '99 L31 for $150, sounds like this TPI set up is a pain in the butt........
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Old 04-23-2011, 11:28 AM
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i talked to my buddy and told him what iv learned, and even found a roller block, he went back a told that guy that supose to be doing that machine work on that non-roller block, what i told him, he repliied BLANK the internet when i get done with this block its going to be right!!! i told (Scott) my buddy that i hope so for your sake $$$$, some plp just hardheaded!!
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