A rookie mistake...
Article: https://www.facebook.com/notes/poser-motorsports/blown-head-gasket-made-worse/3168054043267250/ (https://www.facebook.com/notes/poser-motorsports/blown-head-gasket-made-worse/3168054043267250/)
Thats a BIG Blow between 2+3!
I was thinking the same thing!
Those look like "rim flow" valves, spendy....
Quote from: jedduh01 on November 18, 2019, 11:19:51 AM
Thats a BIG Blow between 2+3!
Yeah, not exactly a pinhole leak.
Quote from: MiniDave on November 18, 2019, 12:35:07 PM
Those look like "rim flow" valves, spendy....
Spendy and hard to find. Plenty of 1 collet grove versions available. I needed a 3 grove version and those were very hard to source.
Video: https://youtu.be/Nz28jIrrses (https://youtu.be/Nz28jIrrses)
Not exactly a "how to." More of a precautionary tale...
I've never seen one blow like that where there wasn't a contributing factor, and not just 10:1 compression. Usually like you said, a head that isn't flat or a block that isn't - although it's usually the head. You didn't see any gaps when you put a straight edge on it?
Looks like you're running 1:15 roller rockers, make damn sure you're not getting coil bind at full lift with those - that can cause all sorts of issues.....I would want to know why the valve bent - was there any indication that it hit the piston?
Interesting sound track - what the heck is that? Nevermind, found it in the comments.
Quote from: MiniDave on November 18, 2019, 01:11:51 PM
I've never seen one blow like that where there wasn't a contributing factor, and not just 10:1 compression. Usually like you said, a head that isn't flat or a block that isn't - although it's usually the head. You didn't see any gaps when you put a straight edge on it?
Looks like you're running 1:15 roller rockers, make damn sure you're not getting coil bind at full lift with those - that can cause all sorts of issues.....I would want to know why the valve bent - was there any indication that it hit the piston?
Interesting sound track - what the heck is that? Nevermind, found it in the comments.
Head and block are flat, ARP studs were torqued correctly. Had <20k on the odo. The valve hit the piston when I was adjusting the valves and rocking the car back and forth. Read the article for the backstory:
https://www.facebook.com/notes/poser-motorsports/blown-head-gasket-made-worse/3168054043267250/ (https://www.facebook.com/notes/poser-motorsports/blown-head-gasket-made-worse/3168054043267250/)
ok, that wasn't clear in the article.....