Do bad valve guides equal lost power?

exgmguy · 05-04-2001, 04:39 AM

My car was burning oil in a couple cylinders. I puled the valve springs to replace the valve seals and found a couple valves that wiggle side to side in the guide. I can also hear my compressed air escaping past them.
Whats weird is that all the cylinders came up with the same 160 lb compression number.

My car also dynoed 270 hp @ 5000 rpm on a Mustang chassis dyno. I think the rpm peak is a few hundred rpm low for a ported TFS/GT-40/E-cammed car. Perhaps these leaky valves have something to do with that?

Any ideas?..........

Rick 91GT · 05-04-2001, 07:23 AM

The bad guides will not only cause a loss of power but you will also start to use more oil, oil contamination in the fuel kills octane ratings.

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Check Out My Site 91GT,Holley SysteMAX II Kit-Heads 2.02" x 1.60" port matched to a 1262,Anderson N-61,24#,76mm C&L,Full MAC exhaust 1-5/8" Long tubes,2-1/2" O.R H-Pipe,2 1/2" cat back, No A/C or PS or emissions, 12" K&N Filter,RNH PERFORMANCE Ram Air,Ron Davis Radiator,Full Suspension,S&W 8pt "X" brace,JAZ seats,3:73's,Welds..etc,4:30's and 31 splines coming very soon!

Mach 1 · 05-04-2001, 12:33 PM

Are you running Trick Flow twisted wedge heads?

exgmguy · 05-04-2001, 03:12 PM

Yes they are Twisted Wedge heads. I imagine an oil contaminated octane rating cannot be good with nitrous........

I am in the middle of yanking the heads right now.

Mach 1 · 05-04-2001, 03:29 PM

I guess the valve guide issues with these heads are true. Do you have your rockers set up exactly the way they descibe on the tech section of their website?

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1993 GT/AOD
'93 Mustang GT

exgmguy · 05-05-2001, 06:59 AM

I have the exact set-up recommended by Lidio Iacobelli of Alternative Auto Performance.

6.7" pushrods, and 1.72 studmount rockers. I bought the heads used from a friend and we both have sprayed a LOT of nitrous through them. I would guess they have 50,000 hard miles on them. Time for a freshening I guess.

05-04-2001, 04:39 AM	#1
exgmguy Registered Member Join Date: Feb 1999 Location: Utica, Michigan Posts: 2,631	Do bad valve guides equal lost power? My car was burning oil in a couple cylinders. I puled the valve springs to replace the valve seals and found a couple valves that wiggle side to side in the guide. I can also hear my compressed air escaping past them. Whats weird is that all the cylinders came up with the same 160 lb compression number. My car also dynoed 270 hp @ 5000 rpm on a Mustang chassis dyno. I think the rpm peak is a few hundred rpm low for a ported TFS/GT-40/E-cammed car. Perhaps these leaky valves have something to do with that? Any ideas?..........

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05-04-2001, 07:23 AM	#2
Rick 91GT Procharged! Join Date: May 1999 Location: Hanover, PA Posts: 1,539	The bad guides will not only cause a loss of power but you will also start to use more oil, oil contamination in the fuel kills octane ratings. ------------------ Check Out My Site 91GT,Holley SysteMAX II Kit-Heads 2.02" x 1.60" port matched to a 1262,Anderson N-61,24#,76mm C&L,Full MAC exhaust 1-5/8" Long tubes,2-1/2" O.R H-Pipe,2 1/2" cat back, No A/C or PS or emissions, 12" K&N Filter,RNH PERFORMANCE Ram Air,Ron Davis Radiator,Full Suspension,S&W 8pt "X" brace,JAZ seats,3:73's,Welds..etc,4:30's and 31 splines coming very soon!

05-04-2001, 12:33 PM	#3
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	Are you running Trick Flow twisted wedge heads?

05-04-2001, 03:12 PM	#4
exgmguy Registered Member Join Date: Feb 1999 Location: Utica, Michigan Posts: 2,631	Yes they are Twisted Wedge heads. I imagine an oil contaminated octane rating cannot be good with nitrous........ I am in the middle of yanking the heads right now.

05-04-2001, 03:29 PM	#5
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	I guess the valve guide issues with these heads are true. Do you have your rockers set up exactly the way they descibe on the tech section of their website? ------------------ 1993 GT/AOD '93 Mustang GT

05-05-2001, 06:59 AM	#6
exgmguy Registered Member Join Date: Feb 1999 Location: Utica, Michigan Posts: 2,631	I have the exact set-up recommended by Lidio Iacobelli of Alternative Auto Performance. 6.7" pushrods, and 1.72 studmount rockers. I bought the heads used from a friend and we both have sprayed a LOT of nitrous through them. I would guess they have 50,000 hard miles on them. Time for a freshening I guess.