Milled the heads .060 What problems can I expect?
12-23-2004, 01:54 PM
#1
TECH Enthusiast
Thread Starter
iTrader: (1)
Join Date: Apr 2002
Location: Highlands Ranch, CO
Posts: 612
Likes: 0
Received 0 Likes
on
0 Posts
Milled the heads .060 What problems can I expect? Trying to get my built 6.0 together after months of downtime due to lack of $$$.
Basically I have a forged 6.0 with custom Diamond pistons (.010 over) that are dished 7cc (was going FI but due to $$$ staying NA for now)
I have a set of stock 5.7 241 heads that I just had milled .060 to compensate for the dished pistons and short Comp 7.350 pushrods I already bought. Plus Comp cams usually has a smaller base circle of .030. I keep reading that the stock pushrods are 7.4 but in other posts, they list them as 7.380. Which one is right?
What other problems will I have due to the milled heads? I'm hoping the intake won't give me too much of a hassle when I bolt it on.
My cam is a Comp 224/222 568/566 114
I'm a little worried about P/V clearance.
I did a quick calculation and found my CR to be 11:1 using this calc:
http://www.c5frc.com/calculators/Com...Calculator.htm
I assumed my heads are 57cc but I will measure them tonight.
Any advice on this would be greatly appreciated.
Basically I have a forged 6.0 with custom Diamond pistons (.010 over) that are dished 7cc (was going FI but due to $$$ staying NA for now)
I have a set of stock 5.7 241 heads that I just had milled .060 to compensate for the dished pistons and short Comp 7.350 pushrods I already bought. Plus Comp cams usually has a smaller base circle of .030. I keep reading that the stock pushrods are 7.4 but in other posts, they list them as 7.380. Which one is right?
What other problems will I have due to the milled heads? I'm hoping the intake won't give me too much of a hassle when I bolt it on.
My cam is a Comp 224/222 568/566 114
I'm a little worried about P/V clearance.
I did a quick calculation and found my CR to be 11:1 using this calc:
http://www.c5frc.com/calculators/Com...Calculator.htm
I assumed my heads are 57cc but I will measure them tonight.
Any advice on this would be greatly appreciated.
12-23-2004, 03:31 PM
#3
http://www.rbracing-rsr.com/compstaticcalc.html
Try this one as well, if nothing else for a comparison. I read one of them doesn't allow valve reliefs as you have to put in a negative number.
Try this one as well, if nothing else for a comparison. I read one of them doesn't allow valve reliefs as you have to put in a negative number.
12-24-2004, 11:34 AM
#4
TECH Enthusiast
Thread Starter
iTrader: (1)
Join Date: Apr 2002
Location: Highlands Ranch, CO
Posts: 612
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Viper
http://www.rbracing-rsr.com/compstaticcalc.html
Try this one as well, if nothing else for a comparison. I read one of them doesn't allow valve reliefs as you have to put in a negative number.
Try this one as well, if nothing else for a comparison. I read one of them doesn't allow valve reliefs as you have to put in a negative number.
I tried that one and got 10.8 then went back to the other and got 10.8.
Oh well.I just pray that my pistons don't hit my valves and the intake goes on smoothly.
12-25-2004, 01:50 PM
#6
TECH Enthusiast
Thread Starter
iTrader: (1)
Join Date: Apr 2002
Location: Highlands Ranch, CO
Posts: 612
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Slowhawk
You'll have to have the intake machined to fit the heads correctly. .060 is too much for the intake to sit right.Would of been better off going with 5.3 or LS6 heads and machining them .030.
I read this from Robert Bartsch
i have heads milled .055 and no intake alignment issues...some with .030, however, have alignment issues...
...these are not serious, however...to solve this problem remove the four metal alignment pins from the plastic intake and shave some metal off the diameter and length...use a file, sandpaper or whatever....
reinstall the pins and it should aling...you will know if you have a problem if the long intake bolts don't line up with the threads in the heads...
...these are not serious, however...to solve this problem remove the four metal alignment pins from the plastic intake and shave some metal off the diameter and length...use a file, sandpaper or whatever....
reinstall the pins and it should aling...you will know if you have a problem if the long intake bolts don't line up with the threads in the heads...
My 6.0 gaskets are a little thicker so hopefully that will help.
I should of just gone .030 and got new pushrods or used the stockers.
