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1965 Chevy Impala timing

Tiny
TIMALMA
  • MEMBER
  • 1965 CHEVROLET IMPALA
Engine Performance problem
1965 Chevy Impala V8 Two Wheel Drive Automatic na miles

I have a new rebuilt 408, 60 over 396 engine--new bearings-pistons-head work-new cam(magnum 280 comp cam)---no problem with performance---runs very well!---However I don't understand why it runs so well @ 30 deg. At idle and 47 total at 3200 rpm's---(no ping etc.)--I just dont know what I did to make the inital timing run so high in order to run very well?---Its driving me crazy--I am 67 year old gear head and can't figure it out--HELP---Tim Fritchen
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Monday, August 31st, 2009 AT 3:29 PM

3 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
All I can think of is the comp cam. Usual timing for 396 is 4 degrees! 30 is the dwell.U didnt measure that did you?
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Monday, August 31st, 2009 AT 3:50 PM
Tiny
TIMALMA
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I use a high energy gnition with 50000 volts--at 4 deg. advance it won't even idle!---as long as the engine is running good I won't take it apart--I had 11 to 1 pistons and changed to 9 1/2 compression for a better driver and went from a 305 to a 280 cam. thanks for your response--Tim


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Tuesday, September 1st, 2009 AT 7:36 AM
Tiny
MERLIN2021
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Tim don't forget, just because the factory spec is 4 degrees, it's an average of 10 motors and where they run best. Can be different! I used to advance until it pings, then back off a bit. Optimal!
Sweet ride!
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Wednesday, September 2nd, 2009 AT 4:31 PM

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