Will I be okay?

[tri5ron]

We can only give you the advise, knowledge, and personal experiences, that you came here to recieve.

GTT is intimately familiar with this particular process, this particular installation, on this particular engine, with it's particular materials, issues, and characteristics.
It's what they do for a living.

It's your money.
You can spend it wherever you choose.
Just choose Wise-ly, so that you don't have to choose Twice-ly.

[trailrider894]

Originally posted by tri5ron
We can only give you the advise, knowledge, and personal experiences, that you came here to recieve.

GTT is intimately familiar with this particular process, this particular installation, on this particular engine, with it's particular materials, issues, and characteristics.
It's what they do for a living.

It's your money.
You can spend it wherever you choose.
Just choose Wise-ly, so that you don't have to choose Twice-ly.

GTT designed the studs, So just like Ron said, there is no better person to install them than the man himself.

[400exmxrider15]

Originally posted by trailrider894
GTT designed the studs, So just like Ron said, there is no better person to install them than the man himself.

Great points guys.

Looks like I'm getting:
Je High Comp 12.5:1
Cometic EST Kit
GTT Heavy Duty Stud Kit
hone


Anything I'm leaving out needed fra top end rebuild?

[trailrider894]

Originally posted by 400exmxrider15
Great points guys.

Looks like I'm getting:
Je High Comp 12.5:1
Cometic EST Kit
GTT Heavy Duty Stud Kit
hone


Anything I'm leaving out needed fra top end rebuild?

I would get a CRF timing chain just for assurance. Make sure to check your valve springs also.

[tri5ron]

Originally posted by trailrider894
I would get a CRF timing chain just for assurance. Make sure to check your valve springs also.

True That.

Also don't forget that you will now be creating a considerably greater amount of heat.

You need to get rid of that heat.

Your stock oil cooler will not be suffecient by itself.

You will need to increase the cooling capacity of your machine accordingly, equal or greater to the amount of increased heat it will be producing.

This means you would be Wise to start using the search function, and learning everything you can on oil coolers, spal fans, increased capacity tanks, rerouted oil to the head, etc.
There are countless threads covering this subject.

Remember, the more you research and learn about your machine,...
The more chance you have of holding onto some of your cash.

Trust us,
The "School of Hard Knocks", and "College of Experience" has a VERY high Tuition.

You can earn some "Scholalship" to those lessons, by researching these subjects and threads.

[sneaky11]

be sure to get your head stud installed before your honing process... or you gonna have tight spot in the cylinder and probably GT will tell you that... with this kind of compression, you will also to change your cam cuz you gonna build to much dynamic compression with the oem cam and BTU's probably gonna sit to long in the chamber, you will need to run higher octan gaz to not predetonate... prefire = hard time for your rod... that is surely something you want to avoid with a fresh new built!!! I suggest you looking for stg2 hotcam(this is a drop-in cam), webcam 450/451 and GT thunder have a cam with the same shape of the web cam I speak of... that is for a 416 or less with the last 2 you will need hardfaced rocker arms for $$$ure.

I'm in the same rebuilt process with a CP 12.5:1 416... and I'm looking to build something that I'll run with around 100 octan... if I can help you with my exriders.com search engin knowledges...

[400exmxrider15]

So now, I'm hearing that a 12.5:1 compression isnt a true 12.5:1....(stock bore) What this mean????

[400exmxrider15]

I just replaced my timing chain at christmas, not but 2 hours on it...

[CJM]

Originally posted by 400exmxrider15
I just replaced my timing chain at christmas, not but 2 hours on it...

A stock chain is ok, but you must understand a CRF chain is MUCH stronger and will stretch and wear out less overtime.

So its always good to do the chain, guides and auto tensioner all at once to be sure everything holds up. Chain stretches, slips a tooth and your gonna have bent valves

[tri5ron]

go back and re-read all the suggestions you have already gotten.

you can not just drop a 12.5:1 piston into a otherwise stock engine, and have it run correctly.
10.5:1 ,....yes, (with some minor tuning/jetting)

12.5:1 ,....No. ( it will need many other components addressed, to accomodate, and compensate, for that high of compression)

The fact that you are not getting the FULL amount of the "Advertised" compression is irrelevant.
That has more to do with the pistons deck height at TDC, which is another subject entirely.