It seems 50 K miles seems a reasonable life expectancy.

As Kermit said in the other thread it is all about the components working together. For a road car, it can take a while to sort it all out.

Terry

I've got over 50,000 miles on a set of Minispares' original Keith Dodd 1.5:1 forged ones.
Bushes and shaft are still fine, so are the pads.

I am not sure any one is beating themselves up. I think I had a run of issues that would not be the standard experience with either roller tip, full roller or bushed.

I did get 70K+ miles on a set of 1.5 full rollers. Is that unusual or should I expect another set to last that long? The I had some issues. Now I have a set of bushed rockers. How long will the the new set last before needing to be re-bushed?

What is the life expectancy of a set of rockers?

Terry

Why do you guys keep beating your selves up with this stuff.  1. this or that ain't.worth spit unless everything else plays well together well.  Waste of money, and roller rockers even for a mini racer is a formula for a DNF. Buy your wife something nice, it will be money better spent.

Fifth change yesterday, but I changed the head gasket as well.

What appeared to be a leak along the head/block interface may have been drips from somewhere else as the MPi top hose runs along that side of the head.

Allow me -

£247.98 = $393.17 at todays exchange rate

//www.calverst.com/shop/index.php?main_page=product_info&cPath=1&products_id=121

1.4:1 ratio rocker set     £247.98

I'd love a set of these, but can't afford one right now. 

The 1.4's ? Keith sent me a link about pricing, but link wouldn't open. What are they going to run ($$$) ?

Jemal loaned me his 1.3 set and offered to give me back my Dodds 1.5s, but I've been reading so much good stuff about those new Calvers.

That is pretty much what I did, but third time is the charm.

Four would be pushing with a slight leak already.

I've done this a few times:
Do it with engine cold.
Drain water below top of block.
Undo the 4 small rocker post nuts first.
Undo the 4 head nuts.
Swap rockers over (leave rocker screws loose for fitting).
Tighten the 4 head nuts first, torque to 40ft/lb.
Tighten 4 rocker post nuts.
Crack & retorque ALL head nuts in order, 1 at a time, to 40ft/lb or whatever.
Adjust rockers, fit cover, refill coolant, you are good to go.

Swaps were made quickly but on a nine stud head.

Jemal, what is your re-torque procedure:

• no loosening, just check torque
• loosen and re-torque each nut individually
• loosen all nut and re-torque all nuts

For the rocker swap:

• just remove whats needed to be removed and leave the other nuts/studs alone?
• loosen all and follow torque procedure

Terry

With a bit of luck and working quickly, it should be quite doable!  What helps is having the 11 stud S-style head because otherwise, all remaining studs are in a line.  Either have your replacement set ready to put right back on, or have a set of dummy pedestals to torque the nuts back on.  I had to pull a Titan set off a race engine to restrict oil flow, and it was only a nine stud with 14 to 1 compression.  I quickly tightened the nuts back down onto dummy pedestals while I worked on the shaft. Several days later I put the modified shaft back on quickly and torqued the head back down.

How many times can you change the rockers without changing the head gasket?

Rebuilt engine

• Harland Sharp rockers - did not work out, but engine had not been run yet
• Switch to MS(Titan) roller rockers 1.3 version - found some eccentric roller tips - engine had 500 miles on it
• Switch to used Titan roller rockers 1.5 version - broke a rocker
• Switch to stock rocker - signs of leak showing after 1000+ miles

I think I was pushing it

Now I get to replace the gasket and install the Calver ST 1.4 rockers...