We have had several discussions, about roller cams on this site. But what about mushroom lifter cams? From what I understand, about roller cams, I really can't see them being worth over $1,000, except in a "all out, max effort" race car. I would think a mushroom lifter setup would cost, maybe $500 and be "more bang for the buck". I am pretty sure existing cams blanks/cores could be used. Any other thought on this?

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Yes this is a neat idea. It would depend on how little or big the mushroom would grow. Do you have any idea of the lift or duration change with that style of lifters? Is this why your asking I would rather install lifters than change cam anytime. JMO

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'72 Duster /6 with turbo build up
'03 Ram 2500 4x4 w/HEMI 5sp 4:10 posi
My Twister Page

You would still have to pull the cam with a mushroom cam/lifter set up. Mushroom lifters are typically installed with the cam out and the engine upside down.

I just saw them for sale on another site for a Mopar.

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11.02 @ 120.56
http://www.youtube.com/watch?v=EAxRmoDgsdY
Chassis dyno
http://www.youtube.com/watch?v=wd6hFGzLJMc

Mushroom lifters, in themselves, don't change anything. They do, however, allow the use of a more agressive cam profile (if the base of the mushroom lifter is a larger dia then the stock lifter. They do require machining to the block, in most cases, so it is not a "drop in" deal. They also have to be installed from the bottom.
These used to be used in a lot of race engines running in classes that did not allow roller cams.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Could you refer me to that link/site/ad, whatever?
I had been thinking of adapting a Ford "flathead", "Y" block", or VW lifter.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Thanks Shaker I was looking up more info when you posted. Then phone rang. By the time I returned Charlie has also given more info on this.
Ok so these are upside down mushrooms with a place in the stem for push rods. The reason for the upside down install and not just dropping them in. What kind of block work Charlie?

For some reason I was seeing the push rod balancing on top of the mushroom as the motor was spinning .

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'72 Duster /6 with turbo build up
'03 Ram 2500 4x4 w/HEMI 5sp 4:10 posi
My Twister Page

I'll take a look.....problem is...I don't remember where!!!

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11.02 @ 120.56
http://www.youtube.com/watch?v=EAxRmoDgsdY
Chassis dyno
http://www.youtube.com/watch?v=wd6hFGzLJMc

The bottoms of the lifter bores have to be spot faced so that the OD of the mushroom(OD portion of lifter that touches the cam lobe) can recess into it for clearance between the block and lifter when the cam lobe is on its nose. There are pros and cons to this style of lifter, and has been said, the lifter itself doesn't make the cam open the valve more, it just changes the opening rates on the ramps because it has a bigger footprint on the cam lobe.

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There's no such thing as too much cam....only not enough engine!

Just getting a cam designed for the larger stock lifters would be of benefit instead of the lobes designed for the smaller chevy lifters.......

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

How much can you overbore the lifters?

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Its been common for over 20 years to put a Ford lifter into a Chevy engine. The Chevy is an .842 diameter lifter, and the Ford is .875 diameter. That small of an increase is very benefical, it adds considerably the area under the curve. What size is the 225 lifter, there is a 1" diameter roller lifter available that many Top Fuel and Funny Car guys use in their Hemis, and it is almost a drop-in for the early GMC 6 cylinders.

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There's no such thing as too much cam....only not enough engine!

Slant six lifter is .905" in diam.

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Part of Tyrde-Browne Racing

When I ordered my Erson cam, I asked John Hartman if the lobes were ground for a .904 dodge lifer. He told me yes...?

Charrlie S,

This is the site I saw for mushroom lifters.

http://www.4secondsflat.com/SM%20Tool%2 ... ifters.htm

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11.02 @ 120.56
http://www.youtube.com/watch?v=EAxRmoDgsdY
Chassis dyno
http://www.youtube.com/watch?v=wd6hFGzLJMc

The big question is what would you gain when you have a head that dies at .600" lift anyway?

In all honesty, I saw a damn fast all motor car at MATS that is running way less camshaft than what I run in my junk.

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Official Cookie and Mater Tormentor.