Mike K3500
Member
New Diamonds are very expensive... I think I priced them and they were close to 400.00
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Pre-Cup swap
- Thread starter 6.5L
- Start date
tanman_2006
Just a farm kid...
Bout the same price as a diamond!
Mike K3500
Member
You would think they're made of "un-obtanium" or "moon-moly"
tanman_2006
Just a farm kid...
:haha:
KrisML
Active Member
Wow! Yea that's a lot to spend, right around $50 each. The engine is a military 6.2. So I guess if the stock ones are not cracked or anything I'll just run them.
For the guys that have had them machinced bigger. How much did that cost you?
For the guys that have had them machinced bigger. How much did that cost you?
Mike K3500
Member
I think I paid maybe a lil over 100.00 bux to have mine done...
KrisML
Active Member
100 bucks sounds lot more reasonable. I'm sure I could find a machine shop to do it where I live but having someone who's done it before would be prefered. So who are you. Guys sending them to?
ak diesel driver
6.5 driver
Technically the precup is supposed to be proud of the head surface by a couple of thousandths. Most machine shops grind the heads flat with the cups in place. Other than that yes. WW said he'd seen a difference in the older heads but he's the only one I've heard mention it.
Will L.
Well-Known Member
You can change any precup out to whatever you want to do for your build.
smaller precups do better with n/a or smaller turbos. When the smaller precups are used with bigger turbo- the smoke .
smaller precups do better with n/a or smaller turbos. When the smaller precups are used with bigger turbo- the smoke .
I forget who posted up measurements of older 6.2 heads and precups and them being different from 6.5 heads and precups on here. I believe it was the diameter of the precup itself into the head. When in doubt measure them. If one is dealing with pre 1992 6.2 heads and wanting to put better precups in them... Get different 6.5 heads. I have seen replacement 6.2 engines with 6.5 casting numbers on the heads. GM's insanity of producing 6.2's while also producing the punched out 6.5 makes no sense to me.
Rockabillyrat
SlIgHtLy StUpId.
WW is correct. The early 6.2 cups are a different size when compared to the 6.5 cups. I have the dimensions written down some where.