Engine: tappets

[T-CAB]

I ran across some new tappets but I am not sure what they fit. Both appear to have the numbers "521" on one underside and "922" on the opposite side. On the upper side one has the numbers "34" while the other has "33". Was there a change between differed v8's over the years?

Thanks for you help.

T-Cab

[PackardV8]

There are at least four different part numbers for the early 1" lifters and at least six different part numbers for the later .904" lifters. However, none of them correspond to the numbers you give.

jack vines

[StudeRich]

I think some people interpret "Tappet" to mean "Rocker Arm". There are at least 3 types of those also, Late '61 to '64 use a 3/4 Adjuster Screw for the shafts with the smaller Oil holes.

[T-CAB]

yes they are the rocker arm and screws..

T-cab

[Jerry Forrester]

I think some people interpret "Tappet" to mean "Rocker Arm".

Nobody cares what I think, but I think tappets are what some people call lifters.

[TWChamp]

Nobody cares what I think, but I think tappets are what some people call lifters.

Yep, I've never heard of rocker arms referred to as tappets until now.

[T-CAB]

Maybe it is a Canadian term! Very common to hear about "Noisy Tappets"

T-Cab

[jclary]

Nobody cares what I think...

Now Now, Jerry...I do!...sometimes

[PackardV8]

There are at least 3 types of those also, Late '61 to '64 use a 3/4 Adjuster Screw for the shafts with the smaller Oil holes.

Nobody cares what I think,

FWIW, I don't think; more like vaguely recollect:

There are at least four rocker/adjuster types; early versions use a 3/8" adjuster hex and later have 7/16", none I've seen would have a 3/4" adjuster hex.

jack vines

[RadioRoy]

Nobody cares what I think, but I think tappets are what some people call lifters.

I have always heard tappets and lifters used interchangeably, along with cam followers.

Rocker arms being called tappets? No way!

[bensherb]

Funny, I've never heard a lifter being called a tappet, it's always been the rocker. Many engines don't have lifters but they still have tappets; and you still have to adjust some of them.

[jackb]

sounds like freeze/expansion/core/other engine plugs.....fwiw, I've heard the tappet/lifter interchange along the way too...

[tsenecal]

Flathead fords were always called tappets. Couldn't find them right away, but tappets for ford tractors are the same. The original ones were solid, and you adjusted the valves by grinding the end of the valve. Here are the later, adjustable version. http://www.yesterdaystractors.com/A0...appet_4450.htm

[jnormanh]

Funny, I've never heard a lifter being called a tappet, it's always been the rocker. Many engines don't have lifters but they still have tappets; and you still have to adjust some of them.

You never listen to Click and Clack, the Tappet Brothers, on NPR?

[Dwain G.]

Anyone here own a set of tappet wrenches? (Google it)