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 VMAX Roller Lifters For Pontiac?
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Douglas Willinger
Sitting Bull

USA
109 Posts

Posted - 01 Aug 2018 :  12:55:45 AM  Show Profile  Reply with Quote

I am disappointed that Rhoads fails to make VMAX *roller* lifters for Pontiac, and that they have no plans to do so in the future. Not having such a part to combine the advantages of a hydraulic roller with that of variable valve timing IMHO is a significant factor in choosing a hydraulic flat tappet cam with the VMAX flat tappet lifters over a hydraulic roller, as none of the latter offer the variable timing feature.

Would like to know how much of a project it would be to develop such a part.

Conversely, what about adapting any of the existing VMAX roller lifters to a Pontiac engine? Could the Pontiac block lifter bores be either machined larger or have sleeves inserted to use any of these other part numbers?

I see VMAX rollers for small and big block Chevrolet, some Fords and Chrysler, and some 6 and 4 cylinder engines listed.

http://rhoadslifters.com/sc2/agora.cgi?cart_id=5501189.6969*vM7HK3&xm=on&product=V-Max_Flat_Tappets



tjs44
Crazy Horse

USA
507 Posts

Posted - 01 Aug 2018 :  10:50:24 AM  Show Profile  Reply with Quote
Virtually all lifters for a pontiac on the market are just SBC including rollers which use a diff link bar.Tom
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Corncob2061
Sitting Bull

USA
165 Posts

Posted - 01 Aug 2018 :  1:34:11 PM  Show Profile  Reply with Quote
You can run a Chevy if you run a bigger base circle to keep the oiling grove from dropping below the lifter galley. The lifter galley and lifter lube gallery is lower on a chevy. Jay

Edited by - Corncob2061 on 01 Aug 2018 1:35:24 PM
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Corncob2061
Sitting Bull

USA
165 Posts

Posted - 01 Aug 2018 :  4:16:47 PM  Show Profile  Reply with Quote
A small 1/4 inch grove below the oil hole to keep the lifters oiled all the time may also be needed depending on the lifter. Not sure which brand of roller lifter Rhoads modifies. Pontiac link bar, careful picking of the cam lobe and base circle, and possibly the small grove in the lifter bore and it should work.
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Steve C.
Chief PONTIAC

1835 Posts

Posted - 01 Aug 2018 :  4:51:14 PM  Show Profile  Reply with Quote
Old lifter band article


https://mail.google.com/mail/u/0/?ui=2&ik=4f3aea0c10&view=att&th=1552b3056333123d&attid=0.1&disp=inline&realattid=f_ip5itet70&safe=1&zw


.
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Douglas Willinger
Sitting Bull

USA
109 Posts

Posted - 01 Aug 2018 :  6:45:08 PM  Show Profile  Reply with Quote
quote:
Originally posted by Corncob2061

You can run a Chevy if you run a bigger base circle to keep the oiling grove from dropping below the lifter galley. The lifter galley and lifter lube gallery is lower on a chevy. Jay




I now see a mention of Pontiac on the Rhoads site listing:

CHEVY V-8 OE ROLLER 21488X
V-MAX FITS: Chevy, GMC & Truck (Buick, Cadillac, Oldsmobile, Pontiac)
1987-88 - 249 (4.1L) Allante
1994-97 - 265 (4.3L) Hi-Performance
1988-92 - 275 (4.5L)
1991-95 - 300 (4.9L) Vin B Cadillac
1987-03 - 305 (5.0L)
1987-03 - 350 (5.7L)

$ 275.00
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Corncob2061
Sitting Bull

USA
165 Posts

Posted - 01 Aug 2018 :  9:16:09 PM  Show Profile  Reply with Quote
That is a ls engine
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Douglas Willinger
Sitting Bull

USA
109 Posts

Posted - 01 Aug 2018 :  9:47:18 PM  Show Profile  Reply with Quote
quote:
Originally posted by Corncob2061

That is a ls engine



LS as in 2004-2006 GTO?
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Corncob2061
Sitting Bull

USA
165 Posts

Posted - 01 Aug 2018 :  10:04:05 PM  Show Profile  Reply with Quote
Sorry, my mistake, it is for the later small block chevys with factory hyd rollers, they do not use link bars

Edited by - Corncob2061 on 01 Aug 2018 10:07:42 PM
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Corncob2061
Sitting Bull

USA
165 Posts

Posted - 01 Aug 2018 :  10:50:09 PM  Show Profile  Reply with Quote
I call them guide bars versus link bars, or retro verses oem style
This is late style GM oem hyd roller
https://www.summitracing.com/parts/edl-97387?seid=srese1&cm_mmc=pla-google-_-shopping-_-srese1-_-edelbrock&gclid=EAIaIQobChMIjvaZuZ_N3AIVDFgNCh1uWgxgEAsYAiABEgJ5yfD_BwE

Retro fit style link bars are on the front side, OEM style links bars fit over the top.


https://www.summitracing.com/parts/cca-854-16

Edited by - Corncob2061 on 01 Aug 2018 11:00:27 PM
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Corncob2061
Sitting Bull

USA
165 Posts

Posted - 01 Aug 2018 :  11:18:46 PM  Show Profile  Reply with Quote
I see the part number for Rhoads retro fit SBC hyd roller, 3500X, but not for sale anywhere??? Jay
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tjs44
Crazy Horse

USA
507 Posts

Posted - 02 Aug 2018 :  11:08:41 AM  Show Profile  Reply with Quote
As far as I know and have done a lot of research,the Comp pontiac hyd roller lifters made by Shaver enterprise in SoCal are the only hyd roller lifter with the oil band in the proper location.They have a S after the part number.If you get a set with a M they are Morel and they are SBC with pontiac link bars.I have 3 sets of the S version running in engines and have made HP to close to 7K RPMs.IMHO they are the only lifters to use in our engines.Tom
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Steve C.
Chief PONTIAC

1835 Posts

Posted - 02 Aug 2018 :  5:42:31 PM  Show Profile  Reply with Quote
Tom,
At that 7000 rpm level what spring pressure ?

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tjs44
Crazy Horse

USA
507 Posts

Posted - 06 Aug 2018 :  10:44:25 AM  Show Profile  Reply with Quote
160 on the seats.Joe will use as much as 180(or did).Sorry about the late reply.Was in Norwalk.Tom
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Douglas Willinger
Sitting Bull

USA
109 Posts

Posted - 07 Aug 2018 :  10:22:03 PM  Show Profile  Reply with Quote
What modifications to a set of Rhoads VMAX roller lifters for sbc be needed to run them in a Pontiac engine?
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tjs44
Crazy Horse

USA
507 Posts

Posted - 08 Aug 2018 :  10:59:05 AM  Show Profile  Reply with Quote
the linkbars would need to be changed.Find out who makes the bodies of the Rhoads.Maybe Johnson or Morel.Tom
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Steve C.
Chief PONTIAC

1835 Posts

Posted - 08 Aug 2018 :  5:21:41 PM  Show Profile  Reply with Quote
For interest note Post 39

http://forums.maxperformanceinc.com/forums/showthread.php?t=813318&page=2



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