HELP! V-train noise!

[modusmortis]

Ok, ever since the hci swap i've been having some problems with valvetrain noise, have adjusted the rockers 3 times now following the instructions for stud mount rr's on Ed C's website. After this latest adjustment the valvetrain noise is just as bad if not worse as before. The noise varies with rpm. Additionally I have NO vacuum at idle, I can pull off a vacuum line and theres no suction at the line (and poor idle).

However, the car runs/has been running great, put down over 300rwhp at 5700rpm and have the potential for a high 12s at the 1/4 if I can get traction. I'm starting to guess faulty lifters, as I just replaced them during the swap with ford racing ones. Anyone got any ideas?

 

[86bluecobra]

No vacuum sounds like they are a little 2 tight and you are losing vacuum because the valves are not closing. I like the instructions on the comp cams website. easy to follow. http://www.compcams.com/Technical/Instructions/Files/151.pdf

 

[modusmortis]

instructions supplied are the same as the ones I followed from FTI (ED C). I tightened each polylock 180* from zero lash.

However when I was tightening I noticed that with some rockers the polylock would become hard to turn on the additional 180* tightening and were impossible to tighten by hand. With others they still felt loose, and I could still tighten the polylock with my fingers (but didn't).

 

[modusmortis]

TTT

 

[FastSVO]

I have a mysterious valvetrain noise too....the car has stock heads with 1.7 rockers and stock valve covers. I am not sure if the valve covers have their oil baffles removed to clear the rockers, but it sounds like a model T at idle.

Could it be the 1.7 rockers have killed my stock valvesprings? Can I remove the driver's side VC w/o removing my GT-40 intake?

Thanks,

Eric

 

[FastSVO]

anyone?

 

[kleer15]

no your goin to have to remove the intake to get at the drivers side valve cover

 

[white 89 GT]

Mine are noisy also, I think the springs are pushing the limit of the lifters.
Try just past O lash,less than 1/8 turn.

 

[ID89GT]

To the one asking about if they have to remove the intake. Yes you will have to remove the upper plenum. Its not that hard to do anyway, and I think you will have to to get the actual valve cover off anyway. All it is is like 6 bolts and disconnect some lines and such. I can have mine off in less than 5 minutes