The V8 Owners Forum -

I actually bought OEM second hand rockers. They were virtually new but was told at the time that OEM were scarce. Even used would be much better than brand new non-OEM ones.

Right had a look at my new after market rockers/ shaft and compared them to my old OE ones:











My measurements: in mm.
After market-
rocker 602154 = 20.62
rocker 602153 = 20.67
shaft 1 = 20.50
shaft 2 = 20.51

Used OE-
rocker HRC 1050 23A = 20.61 horizontal (20.64 vertical)
rocker HRC 1050 24A = 20.62 horizontal (20.65 vertical)
shaft 1 = 20.53 horizontal (20.49 vertical)
shaft 2 = 20.53 horizontal (20.49 vertical)

I will asume there is very little wear measuring the horizontal dimension. You can see the used rockers have worn 0.03, the used shafts 0.04.

The clearance with the rockers 602154 looks reasonable at 0.11 compared to 0.09 for the OE. For rockers 602153 clearance of 0.17 looks too big, nearly twice the OE. I'm going to send these back and get some more.

If you use the vertical dimensions of the OE the clearance goes to 0.15 and 0.16.

Comparing the shafts the AM actually have the oil holes camfered which the OE hasn't.

Tom.

Interesting but you the answer; roller rockers!

Well I have recieved my new rockers, these are branded Britpart OEM. These others were just rapped in old newspaper. These also have date codes cast into them which is nice, shows they are interested in traceability. The finish of the bore is also much finer and the aluminium looks nicer.

They all measure 20.55mm ID which gives a clearance on my 20.51mm shaft of 0.04mm compared to the non branded ones of 0.11 and the worn OE ones of 0.09mm

I don't know if this will even be noticable for noise/ oil pressure. I guess i'll see and maybe curse when it binds as it gets hot due to lack of clearance

Tom.

Super V8. Where did you buy your new "Britpart" rockers from and how much are they?

Paul.

Hi mate,

got them from Island 4x4. (google it). Very happy with service.

Rockers £59.99 inc vat
Shaft £22.99 inc vat

Cheers,
Tom.

Why should you not use steal arms, I heard in the past they are stronger, but by the looks of this thread they should not be used.

SuperV8 wrote:Hi mate,

got them from Island 4x4. (google it). Very happy with service.

Rockers £59.99 inc vat
Shaft £22.99 inc vat

Cheers,
Tom.

Thanks Tom,

Paul.

Did not see that in this thread at all - what is made clear to me though, is that no matter what the material, alloy or steel there are poor quality parts in both that need to be avoided and care needs to be taken.

Andrew

TVRleigh wrote:Why should you not use steal arms, I heard in the past they are stronger, but by the looks of this thread they should not be used.

CastleMGBV8 wrote:V8 Tuner has rockers and shafts which I believe are genuine Rover, approx £120 for the set.

There are some people offering steel rockers which are best avoided.

http://v8tuner.co.uk/category.php?id=32

Kevin.

Should you avoid all steel rockers or just these ones.

I believe that the original Federal Mogul rockers were of good quality however they did require a mod to weld up a non required oilway otherwise excess oiling occured.

I do not know if the currently available steel rockers are federal Mogul ones but there ghave been a lot of reports of them being of a poor quality.

Kevin.

Should you avoid all steel rockers or just these ones.

I think Steel rockers are only needed if you intend to extend the rev range to 6500+ (according to 'How to power tune Rover V8' book) Apparently the rocker shaft will brake at the end before the rockers do.

As for the quality of steel rockers I couldn't say, my rockers I checked were aluminium.

All I can say is whatever parts you fit just check/ measure them to ensure tollerances are ok.

SuperV8 wrote:I think Steel rockers are only needed if you intend to extend the rev range to 6500+ (according to 'How to power tune Rover V8' book) Apparently the rocker shaft will brake at the end before the rockers do.

Since steel is heavier than ally that seems rather odd, increasing the valve train weight with higher rpm sounds like a recipe for disaster to me.

Most folks I know that wanted steel rockers was purely because they had experience of pads falling off.

Get a set of standard ally ones cryogenically treated- should be much stronger and a big weight saving with 16 of the buggers!

CastleMGBV8 wrote:I believe that the original Federal Mogul rockers were of good quality however they did require a mod to weld up a non required oilway otherwise excess oiling occured.

I do not know if the currently available steel rockers are federal Mogul ones but there have been a lot of reports of them being of a poor quality.

Kevin.

I did buy a set, and I found 1 of very poor quality and had it replaced.
I had a problem with the camshaft, so everything got destroyed anyway.

I've since found someone to re-bush my Group A rockers, these are steel, but are much lighter than the V8Tuner ones. plus are adjustable.