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Old 11-12-2021, 11:40 AM
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Default '55 only hydraulic lifters

Not mine
https://www.ebay.com/itm/15469233486...AAAOSwtDVhipTF

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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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Old 11-14-2021, 09:52 AM
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What is the difference in the 55 lifter from the 56 &newer?
I see they are different part numbers,
I thought the only valvetrain differences was 55 had adjustable rockers, Different rockers, studs, nuts.
Just curious

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Old 11-14-2021, 12:56 PM
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I think (but have NO first hand knowledge) that the oil supply was at a different height in the lifter bore, therefore the oil supply grooves in the lifter is inn a different position.

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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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Old 11-14-2021, 02:52 PM
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I think those are called "lowball" lifters.If you have a later lifter check the diff of the seat.I think after talking to Nunzi years ago I used a set with longer pushrods.Tom

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Old 11-14-2021, 04:43 PM
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If the oil band is low, wouldn't SBC lifters work?

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Old 11-14-2021, 06:48 PM
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951 and one of my 5230620 lifters
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Old 11-14-2021, 06:51 PM
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oil hole in same place,push rod cup is lower.I can measure how much if interested.Tom

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Old 11-16-2021, 08:10 AM
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See http://www.pontiacsafari.com/Service...09-October.pdf, page 102.
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Old 11-16-2021, 11:09 AM
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Interesting the lifters I have on hand the oil hole looks in the same location although larger?The 56 looks higher than the 951s also?Tom

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Old 11-16-2021, 11:47 PM
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text from Larry's post above: "A new valve train is used and requires no adjustment (Fig. 10). This was accomplisheo by moving the valve lifter oil supply hole upward to insure ample oil reserve (Fig. 11)"

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