When to sleeve lifter bores.

[DeathBySnuSnu]

I have been running an eagle cam since 1981.
2110 (82 x 90.5) and 44's

The engine finally got tired and got a major rebuild.
Now a 2387 (86 x 94)
So it got a touch more cam.

Now here is the question.
It has run since the early 80,s with a 260 at .050 cam and no measurable lifter bore wear.
Does it need the be sleeved for the 270 at .050?

It is a cb magnesium super case from the same early 80's.
I am ready to go back together with it and before I close it up I want some opion about sleeve or not. No vw specific machine shop for many many miles. So it is ship it out or buy the tooling and do it myself. I was trying to avoid that and was one consideration for getting a cam that was advertised as 266 at .050. Cam came in bigger than expected.

[neil68]

I've been running a magnesium case for over 10 years with several camshafts: Engle W-120 & FK8, Web 86C, 226 & 251 and now Raptor 6908. No issues with the lifter bores yet. IIRC, at some point the mag cases received thicker lifter bores...not sure which year that change was made. Do you have pictures?
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[DeathBySnuSnu]

The most direct on pic I have of the lifter bores.

[jason]

If its in spec leave it. My brother is running that cam with some heads Jeff Denham reworked, lots of power.

[gprudenciop]

i agree those bores look good. one thing to also look at is depending on what lifters you run some are different thickness and can fine tune the lifter to wall gap. are you also planning on giving the lifters the hoover?
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[mark tucker]

be skeerful drilling that it needs to be done at an angle from the bearing side then a short connector from the lifter side. I dont think you need to sleeve them for that cam .I wood however make sure there are no burrs on the lifters any where and deburr the cam lobes good on the edges. Ive seen w100 kill lifter bores so...it's always a crap shoot it seems.( allthough that guy likes tooling around in 4th at 18-20 mph)with a fleawayfrier trani. you might also go with some 1.34 ratio rockers too.

[DeathBySnuSnu]

Yes Mark. That is an old pic, the oil holes are all drilled and yes the one from cam bearing saddle to deep drilling had the be angled.

Cam is deburred, i will give the lifters an extra check.
I have the engle cam kit. The lifters are a bit on the heavy side but look real nice and slick.

It is full hoover and external regulator too. Full flow with no thermostat.

Have a 30mm pump set tight with steel cover.
Hope to run a lot of flow with thin synthetic oil, something like 5w30 or so. I do tend to putt around lugging it. 850lb vehicle with 3.44 ring and pinion.

[58ragman]

when is the determination for a bronze sleeve versus a aluminum sleeve needed.In what applications are the aluminum sleeve used versus bronze sleeve.All I heard of is to bronze sleeve but i seen in some that aluminum sleeve is used like rimco

[mark tucker]

rimco uses whatever is cheep. I would stay away from rimco, far far away. Ive seen steel sleeves that liked like holy shit on a squashed banana peal raper round with chromed dog poop for a topping.

[DeathBySnuSnu]

Well....
Prepping it up, going together not sleeved.

You know Mark.... you may be right about checking lifters.
I bought a set one time and when I got them and looked, the surface finish was way to rough for my liking. I just did not use them. Got a set that had a nice slick ground finish. Makes you wonder if.....

[vugbug68]

the duration isn't necessarily hard on the bores, it is the ramp of the cam, CB cams tend to have mild ramps compared to engle.
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[vwracerdave]

Having too much valve spring pressure is what tears up lifter bores, not the cam. The push rods are at a slight angle and the valve springs puts excessive side loads on the lifters causing the wear.
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[croSSeduP]

[mark tucker]

I dont know what I did with those that had flat spots from the centerless grinder and the lifter not spining all the time.. they were a real mess...gess where they came from???CIP1!!! I always inspect then polish around the head in my lathe to remove any roughness(and sometimes exsessive useless material) and then polish the body good. and always check the face for nicks&burrs too. it isant toe spring pressure that does it. although coil bind can&will do it as can rocker cup to pushrod interfearance and or push&tube interfearance. as well as a moron assembling it.

[croSSeduP]

Don't mean to hi-jack this thread, but... I've noticed that around the oil holes in the lifter sleeves I had installed are some burrs that should be knocked down. However, getting in the lifter bore to de-burr it without nicking any other part of the bore could be problematic. Suggestions?
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[mark tucker]

pencil die grinder with carbide ball end. and dont wory about a knick or 2. I would also add some grooves if needed for full time top end oiling.