Deck smoothness of a block and head from the factory
- Thread starter Suprafast0422
- Start date
IJ.;1153693 said:
So, do you think that surface is too coarse? How smooth should it be? Should I be able to see my reflection or what? lol Do you have any values I can give to the machinist??
Unless he has an optical comparator specs aren't much use to him 
For the HKS I get mine as smooth as humanly possible, I have mine cut with CBN cutters.
I used to Lap both the head and block with Diamond paste but have since found a shop that can give me a perfect surface straight off the machine.
Reg Reimer used to sell small round lapping plates to do this job so it might be worth your while dressing up the surface you already have if the machine shop can't get it any smoother.
Grab a good Macro pic of the surfaces using flash please.
For the HKS I get mine as smooth as humanly possible, I have mine cut with CBN cutters.
I used to Lap both the head and block with Diamond paste but have since found a shop that can give me a perfect surface straight off the machine.
Reg Reimer used to sell small round lapping plates to do this job so it might be worth your while dressing up the surface you already have if the machine shop can't get it any smoother.
Grab a good Macro pic of the surfaces using flash please.
IJ.;1153693 said:
hahahaha that's awesome to know. my ex just installed that very gasket on my 6M recently, after I blew up a cheapie ebay HG at 5,000 miles.
he installed it w/ arp studs though, wonder how long it will last (no boost)
The bead types pretty much seal the same...the best is the HKS stopper type.
HKS MHGs require a smoothness of 30 RA or better...Cometic (Titan) requires a 50 RA.
The Cometic can tolerate a rougher finish...it's less "finicky".
HKS MHGs require a smoothness of 30 RA or better...Cometic (Titan) requires a 50 RA.
The Cometic can tolerate a rougher finish...it's less "finicky".
whats the best stopper mhg their is for the 7m and 2j for high boost applicaitons and what are their RA value requirements
Most of the time the finish is related to how fast they run the machine over it. The slower it's done, the better the finish, but time is money...
I just loaded my block in the trunk of my Crown Victoria. I'm leaving for Youngstown, Ohio tonight. I'm taking my engine to a different machinist, whom I am real close with. I'll be dropping it off Saturday morning...and I'll be coming back Sunday night with it in my trunk, all smoothed out. I will tell my buddy Randy at Engine Machine Service to deck it with an RA value of 30 or smoother. Wish me luck!
I will tell my buddy Randy at Engine Machine Service to deck it with an RA value of 30 or smoother. Wish me luck!
The head was decked at the same shop the block was done at the first time, but the head came out alot smoother. I'm pretty sure it'll be fine.
I have a new shortblock in storage. If I think about it, I'll stop by and pop it open and take a pic.
