Piston clearance???

89fordified · October 7th, 2011, 12:09 PM

I want to know if i will have any issue with piston to valve clearance with some heads with 1.94intake and a stage 1 trick flow cam---499/510...will I need to flycut pistons or will i be ok Jus installing everything??? Help

Mustang Boy · October 7th, 2011, 01:10 PM

Listing what heads you have might help.

89fordified · October 7th, 2011, 01:55 PM

I have some ported dart Windsor Jr heads

fogged306 · October 7th, 2011, 01:55 PM

You need to measure, no way to tell you this for sure over the internet.

89fordified · October 7th, 2011, 02:06 PM

I'm jus Wonderin bcuz I knw of ppl having bigger cam than me and having some bigger heads and just installed with no prob. Not even measuring.

fogged306 · October 7th, 2011, 02:45 PM

Just because they got away with doesn't make it a good idea. Yes the chances are you will be fine with those size valves and that cam, but you always check just to be sure. Deck height, valve reliefs, and compressed gasket thickness come into play checking PTV. Using the valve drop method is a pretty easy way of checking without using clay and having to take the heads off.

StangBanger302 · October 8th, 2011, 08:22 AM

You'll be fine, do it

89fordified · October 8th, 2011, 12:29 PM

I'll be fine?@ stangbanger302 and I have to. About tht method @ fogged306

StangBanger302 · October 8th, 2011, 01:35 PM

Lol...sarcasm right there.

fogged306 · October 8th, 2011, 03:22 PM

Use a checking spring in place of your valve spring and make sure you have the correct length pushrod and your valve train geometry is set up correctly. Then go through the rotation of the crank 720 degrees to make sure the cam makes 1 full revolution with either a dial indicator on the rocker and keep pushing the valve down until it hits the piston when it's close to TDC, or feeler gauges inbetween the valve stem tip and rocker tip. If you have more than .080 on the intake valve and more than .100 on the exhaust through the full 720*, you're fine.

I'm not very good at explaining it but I'm sure if you google it you can find better instructions. PTV clearance "danger zone" isn't when the valve is at peak lift, it's when the valves are just about to open/close. You want more than those clearances I mentioned at these points. Feeler gauge is a pretty simple way of doing it and is how I measure. Just have to make sure you use a checking spring. Your regular valve spring will depress the plunger on a hydraulic lifter and give you false readings. It will also be impossible to push the valve down with your hand to measure PTV clearance anyway.

89fordified · October 9th, 2011, 04:58 PM

Thanks i will try this method if i dont use clay

Modular · December 3rd, 2011, 05:07 PM

Either method will work just fine (clay or drop valve method).

October 7th, 2011, 12:09 PM	#1
89fordified Newbie 1989 Mustang GT Join Date: Jul 2010 Posts: 38 iTrader: 0 reviews	Piston clearance??? I want to know if i will have any issue with piston to valve clearance with some heads with 1.94intake and a stage 1 trick flow cam---499/510...will I need to flycut pistons or will i be ok Jus installing everything??? Help __________________ GT40 Crate motor, BBK cold air intake, BBK headers, B&M shifter,BBK Springs, Off Road H-Pipe dumped off exhaust, Flowmaster

October 7th, 2011, 01:10 PM	#2
Mustang Boy Hardcore Enthusiast 1994 Mustang GT 14.582@92.58MPH Join Date: Sep 2005 Location: tampa florida Posts: 1,729 iTrader: 1 reviews	Listing what heads you have might help. __________________ 315's Crew Black and White Crew Crew Member #2

October 7th, 2011, 01:55 PM	#3
89fordified Newbie 1989 Mustang GT Join Date: Jul 2010 Posts: 38 iTrader: 0 reviews	I have some ported dart Windsor Jr heads __________________ GT40 Crate motor, BBK cold air intake, BBK headers, B&M shifter,BBK Springs, Off Road H-Pipe dumped off exhaust, Flowmaster

October 7th, 2011, 02:06 PM	#5
89fordified Newbie 1989 Mustang GT Join Date: Jul 2010 Posts: 38 iTrader: 0 reviews	I'm jus Wonderin bcuz I knw of ppl having bigger cam than me and having some bigger heads and just installed with no prob. Not even measuring. __________________ GT40 Crate motor, BBK cold air intake, BBK headers, B&M shifter,BBK Springs, Off Road H-Pipe dumped off exhaust, Flowmaster

October 8th, 2011, 08:22 AM	#7
StangBanger302 Hardcore Enthusiast 1992 Mustang LX 13.0 @ 105 Join Date: Jun 2010 Location: New York Posts: 2,230 iTrader: 0 reviews	You'll be fine, do it __________________ As I lay rubber down the street I pray for traction I can keep But if I spin, and begin to slide Please dear God, protect my ride

October 7th, 2011, 01:55 PM	#4
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	You need to measure, no way to tell you this for sure over the internet.

October 7th, 2011, 02:45 PM	#6
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	Just because they got away with doesn't make it a good idea. Yes the chances are you will be fine with those size valves and that cam, but you always check just to be sure. Deck height, valve reliefs, and compressed gasket thickness come into play checking PTV. Using the valve drop method is a pretty easy way of checking without using clay and having to take the heads off.

October 8th, 2011, 12:29 PM	#8
89fordified Newbie 1989 Mustang GT Join Date: Jul 2010 Posts: 38 iTrader: 0 reviews	I'll be fine?@ stangbanger302 and I have to. About tht method @ fogged306 __________________ GT40 Crate motor, BBK cold air intake, BBK headers, B&M shifter,BBK Springs, Off Road H-Pipe dumped off exhaust, Flowmaster

October 8th, 2011, 01:35 PM	#9
StangBanger302 Hardcore Enthusiast 1992 Mustang LX 13.0 @ 105 Join Date: Jun 2010 Location: New York Posts: 2,230 iTrader: 0 reviews	Lol...sarcasm right there. __________________ As I lay rubber down the street I pray for traction I can keep But if I spin, and begin to slide Please dear God, protect my ride

October 8th, 2011, 03:22 PM	#10
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	Use a checking spring in place of your valve spring and make sure you have the correct length pushrod and your valve train geometry is set up correctly. Then go through the rotation of the crank 720 degrees to make sure the cam makes 1 full revolution with either a dial indicator on the rocker and keep pushing the valve down until it hits the piston when it's close to TDC, or feeler gauges inbetween the valve stem tip and rocker tip. If you have more than .080 on the intake valve and more than .100 on the exhaust through the full 720*, you're fine. I'm not very good at explaining it but I'm sure if you google it you can find better instructions. PTV clearance "danger zone" isn't when the valve is at peak lift, it's when the valves are just about to open/close. You want more than those clearances I mentioned at these points. Feeler gauge is a pretty simple way of doing it and is how I measure. Just have to make sure you use a checking spring. Your regular valve spring will depress the plunger on a hydraulic lifter and give you false readings. It will also be impossible to push the valve down with your hand to measure PTV clearance anyway.

October 9th, 2011, 04:58 PM	#11
89fordified Newbie 1989 Mustang GT Join Date: Jul 2010 Posts: 38 iTrader: 0 reviews	Thanks i will try this method if i dont use clay __________________ GT40 Crate motor, BBK cold air intake, BBK headers, B&M shifter,BBK Springs, Off Road H-Pipe dumped off exhaust, Flowmaster

December 3rd, 2011, 05:07 PM	#12
Modular Newbie Join Date: Nov 2011 Posts: 9 iTrader: 0 reviews	Either method will work just fine (clay or drop valve method).

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