I recently took my 69 to a Dyno shop and asked them to dial in my motor. It's not stock so I'm essentially starting with a fresh 468 BB that needs dialed in. I drove the car home but just barely made it. It started backfiring through the carb and surging so bad I had to pull over. I called the shop and they were perplexed. I tried another shop and surprisingly had a similar situation.
So, I suppose if I'm going to dial this in its up to me and Ive spent the last week reaching the first step.
The engine has new MSD 8360 billet ready to run. The first thing I needed to do was get it ready to run. I ran into a snag however. With VA can plugged, I checked the initial timing and it was set @ 16*. Then, with my dial back timing lite, I check the initial and mechanical and find 45* @ 2800-3000. Thats way too much. I want 34-36.
The math doesn't add up. I should have seen 18* + 16* = 34*
So, just as a double check, I change the stop bushing from black (largest-18 degrees) to blue (21 degrees). 21 mechanical + 16 initial gives me 37* which I can adjust down to 36* easily. I check again and I'm still @ 45* @ 2800-3000. Va still plugged.
The change in stop bushing resulted in no change. By my reading here, I need to have ignition squared away first before I take on carb adjustment. (It's a Holley Ultra Street Avenger) So i'm kinda at a standstill till I get this figured out.
Has anyone experienced a problem like this? The timing lite is fairly new but it is possible that its reading incorrectly. I have a backup lite but its not a dial back.
So, I suppose if I'm going to dial this in its up to me and Ive spent the last week reaching the first step.
The engine has new MSD 8360 billet ready to run. The first thing I needed to do was get it ready to run. I ran into a snag however. With VA can plugged, I checked the initial timing and it was set @ 16*. Then, with my dial back timing lite, I check the initial and mechanical and find 45* @ 2800-3000. Thats way too much. I want 34-36.
The math doesn't add up. I should have seen 18* + 16* = 34*
So, just as a double check, I change the stop bushing from black (largest-18 degrees) to blue (21 degrees). 21 mechanical + 16 initial gives me 37* which I can adjust down to 36* easily. I check again and I'm still @ 45* @ 2800-3000. Va still plugged.
The change in stop bushing resulted in no change. By my reading here, I need to have ignition squared away first before I take on carb adjustment. (It's a Holley Ultra Street Avenger) So i'm kinda at a standstill till I get this figured out.
Has anyone experienced a problem like this? The timing lite is fairly new but it is possible that its reading incorrectly. I have a backup lite but its not a dial back.
