This is topic afr head ? in forum Tech Talk at Northern California Ford Owners  .


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Posted by 93lx342 (Member # 1793) on :
 
i have had 3 different motors with afr heads and stud mount rockers.all 3 motors have had noisy rockers.pushrods seem to be the right length.all have had scorpion rockers.do any of you have noisy rockers on your afr headed motors?
 

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Posted by mustanggt5091 (Member # 444) on :
 
I have Crane Golds on my 185's, i wouldnt call them noisy
 

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Posted by 93lx342 (Member # 1793) on :
 
they are quiet cold but noisy hot.got the motor to temp readjusted and they are quieter.
 

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Posted by AJBlackGT (Member # 3936) on :
 
Have you ever thought that maybe its the scorpion rocker? Usually the head wont make a difference in whethere or not the rocker is noisy. Try some comp pro mags.
 

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Posted by 93lx342 (Member # 1793) on :
 
yah true.could be the rockers.
 

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Posted by AaronC (Member # 86) on :
 
I had scorpion rockers and comp pro magnums. They were both loud. The more aggressive the cams ramp rates the more sewing machine noise you will hear. Mine sounded like a sewing machine, lol
 

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Posted by Jeff S (Member # 371) on :
 
You're fine Nate. Hurry and eat your dinner and pump some 100 in the BEAST!!!
 

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Posted by 93PONY (Member # 60) on :
 
Aluminum heads & longtube headers echo the noise. & XE camshaft profiles also make more noise.
I run 1.72 Scorpions on my Iron heads with an XE profile & they are quite loud. I can hear the valvetrain over my exhaust while driving.
 

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Posted by 93lx342 (Member # 1793) on :
 
thats how mine is.jeff had me trippin on it.
 

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Posted by red GT black rallyes (Member # 4495) on :
 
hey what spark plugs are you guys runnin in the 165's ?
 

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Posted by AaronC (Member # 86) on :
 
plugs are autolite 3923's I believe
 

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Posted by Jeff S (Member # 371) on :
 

quote:

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Originally posted by red GT black rallyes:
hey what spark plugs are you guys runnin in the 165's ?

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quote:

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Originally posted by Jeff S:

quote:

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Originally posted by red GT black rallyes:
hey what spark plugs are you guys runnin in the 165's ?

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3924's for NA with 10:1 compression or less. 3923's for Nitrous/Superchager/Turbo or NA with higher than 10:1 compression.

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quote:

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Originally posted by AJBlackGT:
He means yo run the 3923 with a blower. I think he only means n/a higher than 10:1

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Yes, that is exactly what I meant.
 

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Posted by BlackDrop50 (Member # 1715) on :
 
Comp Pro Mags are noisy, but my exhaust is not ...too loud
 

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Posted by 2stangs69-91 (Member # 1951) on :
 
HMM I run a XE 274 with pedistal mounts and they are not noisey at all. FMS 1.6. roller rockers. I have heard AFR cars with roller rockers(actualy have never heard a AFR car with out them LOL.)and some are very noisey. I personaly have never adjusted the valves on any of the AFR motors I have heard.
 

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Posted by 88DroptopGT (Member # 2535) on :
 

quote:

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Originally posted by mtbaughs:
My opinion is that Scorpion rockers suck. A lot of the extra noise is from the sloppy trunions in them. Their along the lines of a pro form rocker or other low dollar option. Even when set to the proper preload they still make a racket at times. I've come to use certain brands rather than others so I don't run into that problem. Also I've gathered the impression that a lot of people stuff in pushrods that are known to be the right size based on what others have run. While many get away with proven sizes you will never beat getting yourself an adjustable pushrod and measuring them out yourself. This way you can set up the valve train to a more precise geometry.

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