Valvetrain question.

Saphirestang89

New Member

Oct 14, 2007

18

0

0

Mt. Juliet TN

May 29, 2008

#1

• May 29, 2008

• #1

Ok so i just put a set of gtp heads on my 89 gt. While a had it apart i went ahead and installed an e303 cam(stock rockers(100k miles) and pushrods). When i fired it up it ran and idles fine but it sounds like someone is tapping on the valve cover with a hammer. I removed the v.c. and rechecked the torque specs on them(25 ft/lbs) but the problem persisted. Whats the deal. The noise dissappears after about 2500rpm(dunno if it goes away or i just cant hear it over exhaust) do these heads require longer pushrods? are my lifters not pumping up? little help would be great.
thanks
-saphirestang89

 

fords2fast4u

Founding Member

Mar 27, 2000

1,426

2

39

Mission Viejo, CA

May 30, 2008

#2

• May 30, 2008

• #2

the torque specs on the valve covers is 25 right? b/c if you meant rockers, then i'm pretty sure they're measured in in/lbs (that's the voice of experience talking from when my friend snapped off three RR boldts! ha!)

um, is the noise in one spot or all over?

 

Saphirestang89

New Member

Oct 14, 2007

18

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0

Mt. Juliet TN

May 30, 2008

#3

• May 30, 2008

• #3

ha yes i meant rockers.
sorry i worded that kinda funny
ya the noise seems to be on the drive side rear
cylinder 7 would be my guess

 

S

smokem331

New Member

May 21, 2008

5

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phoenix, az

May 30, 2008

#4

• May 30, 2008

• #4

One way to figure that out is remove your valve cover and verifiy oil is coming out of all of the rockers. If you see oil coming from all but one rocker then its a bad lifter not pumping oil. For this you might want to place rags on the manifolds and dont rev the engine just let it idle.

getas a little messy if you rev it.

 

8

83blkgt

New Member

May 27, 2008

6

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0

May 30, 2008

#5

• May 30, 2008

• #5

are you running the stock valve covers cause isnt there the baffle or whatever you have to remove when you use stock valve covers

 

fords2fast4u

Founding Member

Mar 27, 2000

1,426

2

39

Mission Viejo, CA

May 30, 2008

#6

• May 30, 2008

• #6

with reusing old parts, especially valve train parts, you want to put them back in the same way they came out. did you make sure not to turn any of them around or put them back in the same order?

I would think its a lifter not doing its job. But you described the noise as a hammering... bad lifters/rockers should sound more like a tapping no? And they would def be harder to hear with the engine at higher RPMs, so it is one of your valve T parts over there...

 

mustangfan1990

New Member

Jul 17, 2005

505

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Lenoir, North Carolina

May 30, 2008

#7

• May 30, 2008

• #7

ummm I know they say toque everything to spec but those should be self adjusting rockers. When I had those I always just snugged them down tight and never had a problem. Sounds like a bad lifter or bent pushrod. I would replace them all if it a bad lifter, so you dont have to keep taking the intake off. Would save money in the long run. Replace the pushrods too they are cheap and a good investment.