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Author
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Topic: New cam, valve spring question...
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H8CHEVY
Gearhead Posts: 276
From: Southern Cali
Registered: Jun 2000
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posted 01-11-2002 04:50 PM
   
Hey guys, purchased a new cam for my 302.. its the Comp cams xtreme energy series #31-234-3.256.. I have the perf rpm aluminum heads, and was wondering do I have to change the valve springs out when I put this cam in, or can I continue to run the springs that are on there? the old cam is a blue racer #wg-1107.. thanks!
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RagTop
Journeyman Posts: 18
From: Pleasanton, CA, USA
Registered: Feb 2001
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posted 01-11-2002 05:08 PM
That all sort of depends on the specs of the new cam vs the old cam and how long you've had the present springs on there. Are they heavy duty springs? I almost lost my 302 by going to a more aggressive cam and not installing new valve springs.------------------
Regards,
RagTop
69 Meadowlark Yellow convertible, 302(308)/4V
69 Royal Maroon SportsRoof, 351W(363)/4V
00 Pewter Camaro Z28, LS1
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H8CHEVY
Gearhead Posts: 276
From: Southern Cali
Registered: Jun 2000
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posted 01-11-2002 06:46 PM
the motor has just under 10K on it.. since the rebuild and the new heads were put on it. the old cam has .448/.472 duration and the new one has .477/.484 gross lift.. thanks alot...
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steve'66
Gearhead Posts: 6602
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 01-11-2002 06:51 PM
I think your springs will be fine with the new cam.  SteveW
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SteveLaRiviere
Administrator Posts: 33988
From: Saco, Maine
Registered: May 99
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posted 01-11-2002 07:39 PM
Just be sure to doublecheck them for coil bound height. ------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
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steve'66
Gearhead Posts: 6602
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 01-11-2002 09:14 PM
quote:
Originally posted by SteveLaRiviere:
Just be sure to doublecheck them for coil bound height.
In other words when the valve spring is fully compressed on a down stroke, see if you can slip a .020 feeler gauge between the coils of your valve springs. If not try different ones and let us know what will fit between the coils. I still think you'll be fine, but it doesn't hurt to check. Good luck, SteveW
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H8CHEVY
Gearhead Posts: 276
From: Southern Cali
Registered: Jun 2000
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posted 01-11-2002 09:24 PM
thanks guys ill let you know what I find this weekend...
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