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Author Topic:   cam timing
johnlj68
Dirt Full Roller

Total posts: 26
posted March 26, 2003 03:06 PM  
I just installed a new cam in my 355. the adverttised duration is 292and lifts are 488 with 1.5 rockers. i will be running 1.6 rockers and would like to know where the timing would fall at with these changes?
This is a chevy with a 500 cfm hollley 2 barrell on a 3/8 mile track with 12 degrees banking.
Thanks, JJ

rico 08
Dirt Forum Champ
Total posts: 1139
posted March 26, 2003 06:56 PM  
1.6 rockers won't change when the valve opens and closes,it only increases the lift and duration under the curve.So if it's been degree'd you're ok.if you are refferring to spark timing that too should be fine.

johnlj68
Dirt Full Roller

Total posts: 26
posted March 26, 2003 07:42 PM  
would the advance timing mark on balancer still be 8 btdc? This is a 3 speed tranny. Thanks, JJ

rico 08
Dirt Forum Champ
Total posts: 1139
posted March 27, 2003 01:24 PM  
That is mostly for stock timing,use total timing to be more accurate,i'd try something in the range of 32-36,i'd borrow a timing light from someone if you don't have one that has the degree knob to set it this way.

dode
Dirt Forum Champ
Total posts: 613
posted March 28, 2003 09:02 AM  
That was my simplified explanation,basicly we both said the same thing.

bncars10sen
Dirt Roller

Total posts: 23
posted April 02, 2003 12:05 PM  
If your running as stock timing gear, check the crank gear, out of the factory they had them retarded. Look closely, turn it around and you will see that it will advance the cam approximately 2-3 degrees. Good Luck

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