15 replies to this topic

[IainNeon91]

Hi all, 

 

I'm getting given a 12g940 metro head. I've decided to put it on my 998. I know you can pocket the block etc. But i'm not going to be doing this, as theres no need when using the standard 998 cam. 

 

The only part that is confusing me is that i will have to use the standard rockers as well, but are these the standard rockers for the 12g940 or my CAM head rockers? Such a noob question i know, i don't even think it's possible to put 998 rockers on a 12g940 is it?

 

An answer would be fab!

 

Iain.

[jaydee]

Actually its possible, but you're gonna have problems if the valves worn their groove in the pads.

[IainNeon91]

So would i just keep the 12g940 standard rockers on? Or would they have too much lift, which would course the valves to come close to the block?

[jaydee]

The lift is same unless its the old type rockers

Sintered are all around 1.21

[jaydee]

These are sintered, about 1.21 ratio

 

These are pressed steel and tend to have a slightly higher ratio around 1.24

[Tommyboy12]

Your second ones are forged rockers Jaydee. They are usually 1.5:1!

[jaydee]

Doh youre right, thats the joy of copying link from google 

 

These are pressed steel though

[IainNeon91]

Ahh i see, gottcha'! Should all go smoothly then. 

 

I will also have to get a smaller water pump pully, yes? Also 1275 head gasket

[patto]

Yep smaller pulley , i would still measure the amount of valve lift and the distance from the face of the valve to the face of the head and double check. if the head has been skimmed a few times there might not be enough gap there.

 

i'm doing one at the moment with a standard cam and i'm still going to have to sink the valves 1.75mm  

Edited by patto, 22 July 2013 - 03:46 PM.

[IainNeon91]

Yep smaller pulley , i would still measure the amount of valve lift and the distance from the face of the valve to the face of the head and double check. if the head has been skimmed a few times there might not be enough gap there.

 

i'm doing one at the moment with a standard cam and i'm still going to have to sink the valves 1.75mm  

Yeah i will double check, but im pretty sure the head hasn't been skimmed. 

 

Please let me know how you find the final product! Message me or something..

[IainNeon91]

Sorry to be a pain, but could somebody link me the recommended size water pump pulley,

 

Thanks!

 

Edit - Something like this?? http://www.ebay.co.u...=item1c34c57630

Edited by IainNeon91, 22 July 2013 - 04:32 PM.

[Tommyboy12]

The early 3.875 inch pulley is what you would ideally want. Before you go spending money on parts I would recommend you check your head for interference to make sure your valves are clearing. Otherwise your going to be wasting money when the head wont fit without work anyway.

[IainNeon91]

Yeah i'm going to be measuring the clearance first. Thanks for the heads up though!

[Stiggytoo]

If it's any consolation I recently got a bit bored in the old garage and decided to fit a metro 1275 head to a 998 engine I have lying around. I assembled it with no head gasket and no valve clearances - it turned over with some room to spare.

I'm not sure but I think this engine has a metro camshaft in it as well. 

[Stiggytoo]

Also, correct me if I'm wrong; but you may also need to fettle away a tad from the top of the water pump as the 1275 overhangs slightly?

Edited by Stiggytoo, 23 July 2013 - 04:45 PM.