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  #16 (permalink)  
Old 07-24-2010, 05:29 PM
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just out of curiosity will a retro cam work in an oem roller block as long as I use the old style timing set and a thrust button?

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Old 07-24-2010, 07:07 PM
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You can use a retrofit roller cam in a oem roller block but you will have to use the timing chain and a roller button that goes with it and also you can not use retrofit roller lifters in the block cause the link bar will hit the top of the lifter pad where the dog bones go unless you grind them down.

That is what I have read in some chevy high performance mags over the last couple of years . You can use oem roller lifters with the retrofit cams but they recommend no lift over 530 with 1.5 ratio rockers.

The reason on the lift part is that the lifter can ride up so high and then go down so low that not enough of the lifter crown will be held in place and they can get knocked out of the dogbone and then spin. Many of the after market cams like comp cam's cast roller cores are made on a smaller circle base and that is what causes some of the issues.

Some have said they ran more lift then that with them but that was what was stated to be on the safe side.

I have read this information on some articles and it was about roller cams and other stuff on them and the things mentioned above was from some guys who was with crane. I hope that will help but but some is from reading on other peoples experiences so take it as opinions and one way but not the right way necessarily.
Eric
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Old 07-24-2010, 07:07 PM
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Yes, but if it is a Vortec w/the plastic cover, you will need to deal w/converting to a different timing cover- the Vortec type plastic cover has different locating tabs than the steel OEM cover and is missing a couple tapped holes in the block.

If you have an earlier OEM roller block, they use a conventional cover, so all would be similar to any retro camshaft install.

Supposedly, 0.353" lift at the lifter is all the OEM lifters are good for. There are aftermarket lifters to increase this if needed.

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Old 07-24-2010, 07:12 PM
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so if the block is a factory oem tbi block 87-95 and I use factory lifters with the dogbone and spider I could use a retro cam with a thrust button?
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Old 07-24-2010, 07:16 PM
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Quote:
Originally Posted by crussell85
so if the block is a factory oem tbi block 87-95 and I use factory lifters with the dogbone and spider I could use a retro cam with a thrust button?
Yes- as long as the lobe lift is what I said above, or you find out the info is wrong.

There are both vertical and horizontal links for retro lifters.
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Old 07-24-2010, 09:59 PM
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[/QUOTE]There are both vertical and horizontal links for retro lifters.[/QUOTE]

I have the lifter out of a 4.3 liter v6, they are oem lifters. I can use these on the retro cam right as long as I stay below your recommended lift?
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Old 07-24-2010, 10:24 PM
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The 90* 4.3L OE Roller V6 uses the same lifters as the 90* OE Roller SBC block, so yes as long as you have 16 lifters. V6 only has 12.
60* 2.8, 3.1 & 3.4L V6 lifters are .200" shorter and work in (Non) Roller SBC blocks.

Last edited by SSedan64; 07-24-2010 at 10:42 PM. Reason: Clarification
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Old 07-24-2010, 10:42 PM
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Quote:
Originally Posted by crussell85
I have the lifter out of a 4.3 liter v6, they are oem lifters. I can use these on the retro cam right as long as I stay below your recommended lift?
Yes, you can- as far as I know. I have NOT done this personally, although I did do quite a bit of looking around here and elsewhere, and I find nothing to the contrary.
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