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10-08-2007, 04:36 PM
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#1 |
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Junior Member
Join Date: Jan 2006
Location: Maryland
Posts: 81
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Re: Valve Spring Selection
Lash on intake is only .012 which makes it .658...Whats deflection worth??
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87 Cavalier, 92 Corvette, 72 Nova, 68 Firebird |
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10-08-2007, 04:51 PM
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#2 |
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Junior Member
Join Date: Jul 2007
Location: Kemah TX
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Re: Valve Spring Selection
I checked mine doing cam lift X 1.7 and it comes out to the .808 the cam is advertised as. Then I put it all together like you are going to run it but with 0 lash and checked it again and I come up with .799 at the valve. I tried three different rockers and they were all the same + or - .001 (Crane wide body rockers). But I have around 305 - 310# on the seat and around 800# open spring pressure so it is going to make things move around. I also run the spring within .050 of coil bind and they seem to last longer. I would guess that is why yours lasted so long they were close to coil bind so they did not surge when they were closing the valve.
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Mike Hedger S/C 4646 MPH Racing and Fabrication |
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10-08-2007, 05:39 PM
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#3 |
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Junior Member
Join Date: Aug 2002
Location: Levittown
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Re: Valve Spring Selection
At 1.55 OD there are not many choices. I've had good luck with Comp Cams #999
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11-10-2007, 07:19 PM
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#4 |
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Junior Member
Join Date: Jan 2006
Location: Maryland
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Re: Valve Spring Selection
Doing some measurements. Was looking at 1.6 rockers to give some added lift. After doing all the calculations, i ended up with .027 clearence before coil bind on the valve spring. Too small? Whats the recomended?
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87 Cavalier, 92 Corvette, 72 Nova, 68 Firebird |
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11-10-2007, 09:01 PM
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#5 |
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Banned
Join Date: Dec 2006
Location: Maryland
Posts: 456
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Re: Valve Spring Selection
Get a Big Block!
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11-10-2007, 10:56 PM
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#6 |
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Junior Member
Join Date: Jan 2006
Location: Maryland
Posts: 81
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Re: Valve Spring Selection
It won't fit in my car Brian! LOL Seen your old nova at delmar a few weeks ago.. Still had your name and number on it crossed out. And why get a big block when we can make a small block run quicker than most big blocks.....<evil grin>
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87 Cavalier, 92 Corvette, 72 Nova, 68 Firebird |
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