The top-feed lifters and valve gear Chrysler used allowed hydraulic lifters with no changes to the block, but that's it. I content that if the slant had an oil galley to feed conventional side-fed hydraulic lifters the oiling path would be less complex and more reliable than the factory devised hydraulic arrangement.

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Joshua

Simpler, certainly. More reliable...? I haven't heard of reliability problems with the oil path to the top-fed hydro lifters, have you?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

I bought an old unused UltraDyne Cam from Slantzilla-and still haven;t used it...and checking the markings against the Ultradyne information I have it looks to be a 266/276 LSA 114 with a .515 lift at 1.5 ratio rockers.... There's always a bit of room for a bit more cam and compression.... or with a wide LSA...Turbo comes to mind....



-D.Idiot

Anyway, pros and cons of the hydraulic cam oiling system aside, can anyone answer the question of how big of a hydraulic cam one could use before one was required to use custom length pushrods?

Reed,

I know pushrods aren't expensive, but most of us are cheap so...

It should really depend on how much block and/or head milling is done along with any changes in valve stem height. To get .060" more lift that means at least .040" off the cam's base circle so you should be able to take .040" off the head or block and come out even with the same head gasket thickness.

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Joshua

Thanks. I anticipate some head milling will occur to obtain the correct dynamic compression ratio. Thanks for pointing that out about the cam regrinding. If I subtract the stock max lift form the reground max lift, I will know the minimum amount of cam thickness that has been removed. So, as long as I shift the entire valve train down the same amount (by milling the the head or deck), the overall geometry should remain the same.

Thanks Josh!

Don't forget to divide the lift difference by the 1.5:1 rocker ratio.
The valve train geometry is fixed as long as the valve stem height doesn't change and the rocker shaft isn't moved. Valve train geometry is is independent of pushrod length with shaft mounted rockers.

You're welcome Reed!

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Joshua

Reed
Dont forget you will go from a steel Shim head gasket to a Composite one.
Frank

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Scrapple: Because a mind is a terrible thing to waste.
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