302 Timing question
Thread Starter
2nd Gear Member
Joined: Jul 2007
Posts: 226
From: Laurel Hill
302 Timing question
Checking the timing in my 66 with a 93 HO 302 in it.
I found TDC of #1 cylinder & the timing mark on HD is at the 0 mark so that must be OK.
Pulled the dizzy cap & I thinkthe rotor is supposed to be pointing at #1 terminal. Well it sorta is ponting that way. It is actually pointing directly between the #1 terminal and the terminal to the left (CCW) of it. Does that sound correct or should the rotor be pointing directly at the #1 terminal?
I found TDC of #1 cylinder & the timing mark on HD is at the 0 mark so that must be OK.
Pulled the dizzy cap & I thinkthe rotor is supposed to be pointing at #1 terminal. Well it sorta is ponting that way. It is actually pointing directly between the #1 terminal and the terminal to the left (CCW) of it. Does that sound correct or should the rotor be pointing directly at the #1 terminal?
Thread Starter
2nd Gear Member
Joined: Jul 2007
Posts: 226
From: Laurel Hill
RE: 302 Timing question
Guess I should add why I'm checking it.
The car starts great but it seems a little sluggish to me.
I checked the timing with a timing light & it was 19 degrees!! It never pinged though, not even under WOT and a 100 degree midday temperature. So that sounds weird to me. I would have bet it would have been pinging like crazy with that much timing (even with the 93 fuel I always run).
The car starts great but it seems a little sluggish to me.
I checked the timing with a timing light & it was 19 degrees!! It never pinged though, not even under WOT and a 100 degree midday temperature. So that sounds weird to me. I would have bet it would have been pinging like crazy with that much timing (even with the 93 fuel I always run).
2nd Gear Member
Joined: Aug 2007
Posts: 316
From: L A 32548
RE: 302 Timing question
Hey Art,
I'm running, the generally accpted, 13d advance on my 5.0(EFI), what dizzy & induction are you using??
Is this a recent install, or have you had it running for a while??
I'm running, the generally accpted, 13d advance on my 5.0(EFI), what dizzy & induction are you using??
Is this a recent install, or have you had it running for a while??
Thread Starter
2nd Gear Member
Joined: Jul 2007
Posts: 226
From: Laurel Hill
RE: 302 Timing question
I've had the car about 4 months & motor combo has been in about 1.5 years.
It has an old Edelbrock F4 dual plane & Holley 600. Dizzy looks like a reman 1966 & I put Pertronix I in it soon after I bought it.
I was wondering if the rotor not pointing directly at the #1 terminal is because of the 14 degrees advance I have right now. If so then I guess everything is in sync.
Think I should lower my timing some more?
It has an old Edelbrock F4 dual plane & Holley 600. Dizzy looks like a reman 1966 & I put Pertronix I in it soon after I bought it.
I was wondering if the rotor not pointing directly at the #1 terminal is because of the 14 degrees advance I have right now. If so then I guess everything is in sync.
Think I should lower my timing some more?
2nd Gear Member
Joined: Aug 2007
Posts: 316
From: L A 32548
RE: 302 Timing question
Every thing you have, seems to be correct, though the 12-14d advance is static.You are plugging off the vac advance to check inital timing?? With the engine running, total advance(withvac advance) could be 32-36d. If you have 16d total advance, there is lots more room to go.
Thread Starter
2nd Gear Member
Joined: Jul 2007
Posts: 226
From: Laurel Hill
RE: 302 Timing question
I set it with the vacuum line disconnected.
With vac I think it was about 30-35 at about 3000 RPM.
Another question. The PO had the dizzy vac advance line connected to the full vacuum port on the Holley. I looked at the Holley manual & the port for the dizzy vacuum was blocked off. I switched it so the dizzy is hooked to the port Holley says is for the dizzy. Couldn't really tell a difference when driving.
With vac I think it was about 30-35 at about 3000 RPM.
Another question. The PO had the dizzy vac advance line connected to the full vacuum port on the Holley. I looked at the Holley manual & the port for the dizzy vacuum was blocked off. I switched it so the dizzy is hooked to the port Holley says is for the dizzy. Couldn't really tell a difference when driving.
2nd Gear Member
Joined: Aug 2007
Posts: 316
From: L A 32548
RE: 302 Timing question
Sounds right then.
Art a side question. When you swapped the dizzy, did you use a drive gear compatible with the EFI cam?? Dizzy drives for flat tappet cams, will get chewed up, when used on a roller lifter cam.
Mallory sells drive gears for both.... Hehheh, just checkin.
Art a side question. When you swapped the dizzy, did you use a drive gear compatible with the EFI cam?? Dizzy drives for flat tappet cams, will get chewed up, when used on a roller lifter cam.
Mallory sells drive gears for both.... Hehheh, just checkin.
4th Gear Member
Joined: Jun 2006
Posts: 1,483
From: Fontana, California
RE: 302 Timing question
ORIGINAL: Art Brock
Checking the timing in my 66 with a 93 HO 302 in it.
I found TDC of #1 cylinder & the timing mark on HD is at the 0 mark so that must be OK.
Pulled the dizzy cap & I thinkthe rotor is supposed to be pointing at #1 terminal. Well it sorta is ponting that way. It is actually pointing directly between the #1 terminal and the terminal to the left (CCW) of it. Does that sound correct or should the rotor be pointing directly at the #1 terminal?
Checking the timing in my 66 with a 93 HO 302 in it.
I found TDC of #1 cylinder & the timing mark on HD is at the 0 mark so that must be OK.
Pulled the dizzy cap & I thinkthe rotor is supposed to be pointing at #1 terminal. Well it sorta is ponting that way. It is actually pointing directly between the #1 terminal and the terminal to the left (CCW) of it. Does that sound correct or should the rotor be pointing directly at the #1 terminal?
Thread Starter
2nd Gear Member
Joined: Jul 2007
Posts: 226
From: Laurel Hill
RE: 302 Timing question
The dizzy has the correct gear for the roller cam (I think it's harder than the older one?).
I retimed to 12 degrees & I am getting ready to drive her to work.
I'll post later from work & give a performance update.
Thanks for all the help guys.
I retimed to 12 degrees & I am getting ready to drive her to work.
I'll post later from work & give a performance update.
Thanks for all the help guys.