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Author Topic: Piston to valve contact or not  (Read 827 times)
68sportcoupe
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« on: March 27, 2017, 09:13:27 pm »

Does this look like contact
Or flycut notched


* IMG_7407.PNG (825.35 KB, 640x1136 - viewed 58 times.)
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68 falcon sportcoupe 289 tpldr 9"detroit lkr 390s.
67 falcon 351 w.
68 falcon fact ac 6 cyl.
68 falcon undergoing v8 swap.
67 falcon best one i got no rot mint interior
knucklefux
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« Reply #1 on: March 27, 2017, 09:38:21 pm »

Is the valve bent?
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« Reply #2 on: March 27, 2017, 09:41:00 pm »

Hard to say. That looks like a damn clean cut.

Are the other pistons the same way? Any evidence of contact on the valves?
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Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
68sportcoupe
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this is where it all started 16 bday


« Reply #3 on: March 27, 2017, 09:41:55 pm »

Not sure it's not mine


* IMG_7409.PNG (1238.34 KB, 1136x640 - viewed 57 times.)
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68 falcon sportcoupe 289 tpldr 9"detroit lkr 390s.
67 falcon 351 w.
68 falcon fact ac 6 cyl.
68 falcon undergoing v8 swap.
67 falcon best one i got no rot mint interior
woody
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« Reply #4 on: March 27, 2017, 09:52:01 pm »

most definitely it is
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68sportcoupe
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Location: pelham NH
this is where it all started 16 bday


« Reply #5 on: March 27, 2017, 09:57:21 pm »

It is what?
fly cut
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68 falcon sportcoupe 289 tpldr 9"detroit lkr 390s.
67 falcon 351 w.
68 falcon fact ac 6 cyl.
68 falcon undergoing v8 swap.
67 falcon best one i got no rot mint interior
68sportcoupe
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Posts: 82

Location: pelham NH
this is where it all started 16 bday


« Reply #6 on: March 27, 2017, 10:09:56 pm »

I thought it looked to clean to be contact
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68 falcon sportcoupe 289 tpldr 9"detroit lkr 390s.
67 falcon 351 w.
68 falcon fact ac 6 cyl.
68 falcon undergoing v8 swap.
67 falcon best one i got no rot mint interior
juiced coupe
Six figures worth of don't give a f*ck
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« Reply #7 on: March 27, 2017, 10:18:39 pm »

Yep.

See that shinny, carbon free ring around the valve? The one that matches the indentation in the piston.

Definitely contact.
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Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
woody
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« Reply #8 on: March 27, 2017, 11:43:53 pm »

have cut a million piston reliefs, deeper, wider, moved them etc. That is without doubt serious piston to valve contact that would have been caught on day one with a simple clay check
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331-347 Short Blocks 2099.00 and up
408-418-427 Short Blocks (F4 Roller Blocks Standard) 2399.99 and up
Dart Shorts 4199.00+
D.I.Y Shortblocks 1799.00

FordStrokers.com

Make sure you get your information from the internet gurus that haven't built SHIT, they did sleep at Holiday Inn last night, and we have a few of those gurus right here on this forum. Smiley
68sportcoupe
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this is where it all started 16 bday


« Reply #9 on: March 28, 2017, 03:46:57 am »

Thanks for the info
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68 falcon sportcoupe 289 tpldr 9"detroit lkr 390s.
67 falcon 351 w.
68 falcon fact ac 6 cyl.
68 falcon undergoing v8 swap.
67 falcon best one i got no rot mint interior
ford rules
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« Reply #10 on: March 28, 2017, 06:07:25 am »

have cut a million piston reliefs, deeper, wider, moved them etc. That is without doubt serious piston to valve contact that would have been caught on day one with a simple clay check

When claying, you would want the head fully torqued with gasket in place correct?
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68sportcoupe
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Location: pelham NH
this is where it all started 16 bday


« Reply #11 on: March 28, 2017, 09:22:50 am »

Wasn't mine  someone else posted it
I thought it looked to clean
But I guess I was wrong
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68 falcon sportcoupe 289 tpldr 9"detroit lkr 390s.
67 falcon 351 w.
68 falcon fact ac 6 cyl.
68 falcon undergoing v8 swap.
67 falcon best one i got no rot mint interior
woody
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« Reply #12 on: March 28, 2017, 09:36:47 am »

have cut a million piston reliefs, deeper, wider, moved them etc. That is without doubt serious piston to valve contact that would have been caught on day one with a simple clay check

When claying, you would want the head fully torqued with gasket in place correct?
I use an old fel pro mls gasket. I just cinch it down, any extra crush from torquing it wont amount to a hill of beans. If its .050 while cinched down or .040 torqued down, if you have piston to valve clearance issues at .040 you have it at .050 as well. If a guy is using a composite gasket like a 9333, no need to run the risk of ruining it by toruqing it down.

Exhaust, good to go, intake not good to go, time to cut the relief higher


* borror1.jpg (47.81 KB, 800x600 - viewed 40 times.)

* borror4.jpg (40.79 KB, 800x600 - viewed 43 times.)
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331-347 Short Blocks 2099.00 and up
408-418-427 Short Blocks (F4 Roller Blocks Standard) 2399.99 and up
Dart Shorts 4199.00+
D.I.Y Shortblocks 1799.00

FordStrokers.com

Make sure you get your information from the internet gurus that haven't built SHIT, they did sleep at Holiday Inn last night, and we have a few of those gurus right here on this forum. Smiley
FordRacing250
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« Reply #13 on: March 28, 2017, 11:42:08 am »

Definitely p to v contact. You can see where the valve is shiny also.
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RaceTec Pistons
tim@racetecpistons.com
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« Reply #14 on: March 29, 2017, 06:04:55 am »

have cut a million piston reliefs, deeper, wider, moved them etc. That is without doubt serious piston to valve contact that would have been caught on day one with a simple clay check

When claying, you would want the head fully torqued with gasket in place correct?
I use an old fel pro mls gasket. I just cinch it down, any extra crush from torquing it wont amount to a hill of beans. If its .050 while cinched down or .040 torqued down, if you have piston to valve clearance issues at .040 you have it at .050 as well. If a guy is using a composite gasket like a 9333, no need to run the risk of ruining it by toruqing it down.

Exhaust, good to go, intake not good to go, time to cut the relief higher

What would you consider an acceptable amount of clearance?
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