PTV how about PTSpark plug?
04-03-2012, 07:56 PM
#1
PTV how about PTSpark plug?
I finally got around to checking my piston to valve clearance. It was spectacular and never got close to spec(.08 I believe is minimum). Problem I have is that the piston is just barely hitting the hump for he spark plug. Luckily I noticed it as I was starting to clean the heads one final time before installing them. I saw this nick in all 4 cylinders .
I went ahead and confirmed with clay that they were new and fresh marks. Sure enough they are. There is a large knot for the spark plug threads and I think I should be OK to grind some away but wanted to see what others had for ideas. Biggest thing is will be I OK to use these heads.
Here is where it is contacting on the piston.
I didn't have a head gasket so that is another .051 of clearance but if I am lucky that currently gets the piston to not touch the head I still need some clearance for safety!
Here is the head with clay on it.
I went ahead and confirmed with clay that they were new and fresh marks. Sure enough they are. There is a large knot for the spark plug threads and I think I should be OK to grind some away but wanted to see what others had for ideas. Biggest thing is will be I OK to use these heads.
Here is where it is contacting on the piston.
I didn't have a head gasket so that is another .051 of clearance but if I am lucky that currently gets the piston to not touch the head I still need some clearance for safety!
Here is the head with clay on it.
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04-03-2012, 11:56 PM
#9
Man... I don't know what to tell you. Honestly I'd try it with a head gasket and see if you still have contact/check your clearance. Get a cheapy graphite gasket or throw a used one in there. I'm assuming you're going to be using ARP studs or bolts, so go ahead and torque them down, and see where you stand.
I don't know about taking some material out of the head, but it would be something to look into if you really want to use those heads. G'luck
I don't know about taking some material out of the head, but it would be something to look into if you really want to use those heads. G'luck
04-04-2012, 04:56 AM
#10
I am not using a gasket because I don't have an old one and Kinda foolish to mess up the new $45 gasket when I can just add .051 to my measurements. Maybe I am wrong but sees pretty simple to me.
Does anyone know what kind of clearance I should have? I know PTV is preferred to be .081 but does that apply to piston to head too? Like I said I think the gasket will get me so they no longer touch but I want some more room them flush!
Guys on LS1 said take it out of the piston if anything. I don't like that idea at all.
I think I am going to shave a tiny bit off the head and call it good. A quick hand filing of the head should clear out plenty of material so there are at least a few thousands of clearance. Shouldn't be enough to effect the integrity of the spark plug boss and gain me the clearance I need.
Does anyone know what kind of clearance I should have? I know PTV is preferred to be .081 but does that apply to piston to head too? Like I said I think the gasket will get me so they no longer touch but I want some more room them flush!
Guys on LS1 said take it out of the piston if anything. I don't like that idea at all.
I think I am going to shave a tiny bit off the head and call it good. A quick hand filing of the head should clear out plenty of material so there are at least a few thousands of clearance. Shouldn't be enough to effect the integrity of the spark plug boss and gain me the clearance I need.