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Discussion Starter · #1 ·
Ok, I called afr direct as i realized the listing for the valvesprings says for hydralic not solid cams. I explained
to AFR tech i'm planning to use the comp cam 282s and i wanted to know if i need to change the valvesprings that are on the 165's i already have. he said for sure as the basic springs are for mild cams and he did not think they would handle the ramp rates on of the 282s, so i see where comp recommends a 972-16 spring 328 lbs/per in. rate w/ the 282s cam which i tell the AFR tech this as well, he says comp cams tends to use softer springs to protect their cam and says i should use a 977-16 spring w/ 441 lbs/per in. rate. So now i'm not sure what to do. The afr tech says i need a spring w/ about 135-140 lbs on seat ,the stock afr springs i have are 120 lbs.on seat. Any recommendations? Oh
Afr tech said the stock springs that are on head now are
325 lbs/per in rate.. Car is mostly street use w/ a few trips to track during the year..

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'65 2+2 TimeMachine: 289, stock heads, 4v ,4sp ,3.80 posi, 13.84 @ 100.65

1991 Honda Civic Si- daily driver
2002 Midnight Edition Ford Escape

<font size=-1>[ This Message was edited by: ga289stocker on 11/22/06 3:11am ]</font>

<font size=-1>[ This Message was edited by: ga289stocker on 11/22/06 3:12am ]</font>
 

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What a bunch of poo poo! I'll put it this way...972s installed at 1.800 height and I have reved my 331 to 6800. I have 1.94/1.6 SS Manley or similiar valves. Your intake valves on the 165s are smaller and lighter. Those other springs, the 977s are too stiff and will use up HP and wear the cam out faster.

972s are 308 lbs/in I believe. I'm going to use 26986 beehives because i'm going to 1.7 rockers. They are 124 lbs installed and 280 lbs/in...an even lighter spring, but as good valve control as 986 dual springs they recommend for the 294S cam. 26986s are even good enough for some of their roller cams.

I digress...your springs are good enough if their quality is good enough.

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Tracy Blackford: Corona, Ca
'65 FB Mustang 331, 282S cam, ported 351W heads. T5z, 3.50 9" posi.
346 [email protected] on a warm spring day (335 RWHP SAE corr.)



<font size=-1>[ This Message was edited by: blkfrd on 11/22/06 4:08am ]</font>
 

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Discussion Starter · #3 ·
Thanks Tracy, I just actual called comp cams techline and they said i should be fine using the springs on the AFR's now. I saw your prior post your you mentioned have a 331 using the 972-16 springs from well over 6k rpm.. I know my combo is not near as strong as yours..i'm just going w/ the ones already on the heads now and be done w/ it...one other note side, the comp cams tech said to remove the inner spring for break-in period of 20 min's and to run motor at no less than 2k rpm , is that right?
 

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I would just leave them on, you can go to the dyno to see how they handle the high rpm and try to figure out if there is valve float. They are easy to swap out later anyway. No sense throwing money away if it is not needed.
 

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No inner springs on 972s...just an inner damper...leave it in during breakin.

Whoops...sounds like your going to use the AFR springs. If the inner spring is a damper (flat stock wound into a spiral), I do not believe you need to remove it.

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Tracy Blackford: Corona, Ca
'65 FB Mustang 331, 282S cam, ported 351W heads. T5z, 3.50 9" posi.
346 [email protected] on a warm spring day (335 RWHP SAE corr.)


<font size=-1>[ This Message was edited by: blkfrd on 11/22/06 4:31am ]</font>
 

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My AFR165 heads (model 1402) definitely had dual springs. Just to minimize the chances of wiping a lobe during cam during break-in, I removed the inner springs before installing the heads. Once the break-in was done, it was only a matter of about 1-1.5 hours of effort to get the inner springs reinstalled; not much effort compared to replacing a cam.

It might not have made a difference, but I felt better doing everything I could to break the cam in without issues.
 
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