This is topic found out where my boost went in forum Tech Talk at Northern California Ford Owners  .


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Posted by 99gt-UJSTLST (Member # 584) on :
 
well I finally took my 99gt apart
and I found why I was only makeing 8psi instead off 18

well I took the heads off my motor and the passanger side had the valves bent again
fuck

I thought my timing was off but afthere checkin it out, I found it was fine

I guess I just had way to much lift on my cam's and when it was reved to high RPMs the valves kissed the pistons

Oh well back to the drawing board

Im just goin to dump a stock motor in it
meen while I'll save some cash to buy a 5.4l DOHC motor with a automatic

I guess ill part out the 4.6 block and heads
 

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Posted by Teddy Tiger (Member # 2473) on :
 
Why not just stroke your 4.6? That's all the real difference between it and a 5.4

Nick
 

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Posted by 99gt-UJSTLST (Member # 584) on :
 
yea but I can strocker the 5.4 way more then the 4.6
 

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Posted by 281n/a (Member # 1465) on :
 
that's a common problem on our 46ers fompk cams heard nothing but horror stories.The only safe cams are shm or houston perf
 

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Posted by 99gt-UJSTLST (Member # 584) on :
 
yea im thinking if I get cams im goin to buy freshly made cams fuck this reground BS
 

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Posted by Synergy Motorsports (Member # 2846) on :
 
The SHM cams are good because they are not reground. I have had no problems with those yet. You could always stroke your 281 to make it a 300. Thats what we did with a Saleen. Also, as for over reving that motor will cause the rockers to come off. Thats most likely why you bent the valves. The rockers are way too touchy in this motor.
 

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Posted by 99gt-UJSTLST (Member # 584) on :
 

quote:

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Originally posted by Synergy Motorsports:
The SHM cams are good because they are not reground. I have had no problems with those yet. You could always stroke your 281 to make it a 300. Thats what we did with a Saleen. Also, as for over reving that motor will cause the rockers to come off. Thats most likely why you bent the valves. The rockers are way too touchy in this motor.

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