Piston dome hits the head
Thread Starter
Teching In
Joined: Aug 2014
Posts: 29
Likes: 0
Piston dome hits the head Was checking clearances during assy and hit a major snag!
The Piston dome hits the spark plug boss!
The options are to remove metal from the plug boss, or remove metal from the top of the piston.
The plug boss could be modified(cut down)
or
A small notch in the dome would fix it (1/2"x 1/2"x .040")
Which is the proper remedy?
Quench is .037" with a .040' head gskt, Heads are stock LS3, Pistons are custom CNC billet.
Short block has been line honed, balanced and assembled.
Thanks,
John
The Piston dome hits the spark plug boss!
The options are to remove metal from the plug boss, or remove metal from the top of the piston.
The plug boss could be modified(cut down)
or
A small notch in the dome would fix it (1/2"x 1/2"x .040")
Which is the proper remedy?
Quench is .037" with a .040' head gskt, Heads are stock LS3, Pistons are custom CNC billet.
Short block has been line honed, balanced and assembled.
Thanks,
John
Last edited by Mongo510; Apr 2, 2016 at 02:55 AM. Reason: more info
Was checking clearances during assy and hit a major snag!
The Piston dome hits the spark plug boss!
The options are to remove metal from the plug boss, or remove metal from the top of the piston.
The plug boss could be modified(cut down)
or
A small notch in the dome would fix it (1/2"x 1/2"x .040")
Which is the proper remedy?
Quench is .037" with a .040' head gskt, Heads are stock LS3, Pistons are custom CNC billet.
Short block has been line honed, balanced and assembled.
Thanks,
John
The Piston dome hits the spark plug boss!
The options are to remove metal from the plug boss, or remove metal from the top of the piston.
The plug boss could be modified(cut down)
or
A small notch in the dome would fix it (1/2"x 1/2"x .040")
Which is the proper remedy?
Quench is .037" with a .040' head gskt, Heads are stock LS3, Pistons are custom CNC billet.
Short block has been line honed, balanced and assembled.
Thanks,
John
Sometimes this happens with custom stuff, especially big domes. I would give the piston supplier a call and let them know so they can make a change to the design in case you need another piston later down the road.
This case is weird cause the spark plug seats well inside the combustion chamber so either the plug is too long for the application or the Pistons were installed front side to the back imo.
...that gets removed in all the CNC ported heads, right?
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Verdad Gallardo Depends how much grinding you do I guess. You can probably take off some of the bump and some of the dome so neither is really too aggressive to cause problems.
Got any pictures of your pistons?
Got any pictures of your pistons?
Thread Starter
Teching In
Joined: Aug 2014
Posts: 29
Likes: 0
Black on black ....Thicker gasket will just kill my Quench, which is at .037"
Camster... the heads have never yet had a plug in them.
KCS....I will see about a pic
I dont really have a problem with running a shorter reach plug. What reach do they run on CNC'd heads?
Camster... the heads have never yet had a plug in them.
KCS....I will see about a pic
I dont really have a problem with running a shorter reach plug. What reach do they run on CNC'd heads?
Just the typical NGK TR/6 style plug. I think the CNC programs typically just mill down and profile that bump without really mowing down the threads.
