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1970 440-6 timing #86766 07/10/08 01:41 PM 07/10/08 01:41 PM
A Anonymous OP Unregistered
Anonymous OP Unregistered A	after spinning a rod bearing at 250 miles the engine is redone and back in the Cuda. I have the timing set at 10* BTDC and advance is at 34* yet when I back off the gas I get popping out both pipes and it seems I am getting a slight surge action while highway driving. I was told locally to retard the timing about five degrees, do you agree

Re: 1970 440-6 timing #86767 07/10/08 01:57 PM 07/10/08 01:57 PM
Joined: Mar 2006 Posts: 9,910 Eighty Four, PA B G Racing master
B G Racing master Joined: Mar 2006 Posts: 9,910 Eighty Four, PA	Quote: after spinning a rod bearing at 250 miles the engine is redone and back in the Cuda. I have the timing set at 10* BTDC and advance is at 34* yet when I back off the gas I get popping out both pipes and it seems I am getting a slight surge action while highway driving. I was told locally to retard the timing about five degrees, do you agree No,don't retard it.Check for a fluxuation in the distributer timing advance/retard,or a lean condition first. [IMG]http://i430.photobucket.com/albums/qq21/ajcasini/max_zpsdppwd9km.jpg[/IMG]

Re: 1970 440-6 timing [Re: B G Racing] #86768 07/10/08 02:00 PM 07/10/08 02:00 PM
A Anonymous OP Unregistered
Anonymous OP Unregistered A	I agree, probably lean, Especially check the idle circuits on all three carbs.

Re: 1970 440-6 timing #86769 07/10/08 02:01 PM 07/10/08 02:01 PM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	surge usualy means lean doesn't it? I'd think 34* would be not enough timing. I usually set my total 1st and don't worry to much about int. If your vacuum advance is hooked up you could be advancing a lot more than you think. I'd probably start at 36* total @ 2600rpm and work form there.

Re: 1970 440-6 timing [Re: Mr.Yuck] #86770 07/10/08 03:48 PM 07/10/08 03:48 PM
A Anonymous OP Unregistered
Anonymous OP Unregistered A	should I plug the vacuum advance and not use it?

Re: 1970 440-6 timing #86771 07/10/08 04:12 PM 07/10/08 04:12 PM
Joined: Nov 2003 Posts: 2,715 closer to Canadian beer! torkrules I'm neurotic
torkrules I'm neurotic Joined: Nov 2003 Posts: 2,715 closer to Canadian beer!	You'll need to experiment with it. Some work better with, some without. Some like ported vacuum, some like manifold vacuum.

Re: 1970 440-6 timing [Re: torkrules] #86772 07/10/08 04:13 PM 07/10/08 04:13 PM
A Anonymous OP Unregistered
Anonymous OP Unregistered A	thanks for the tips guys, will see what works.

Re: 1970 440-6 timing #86773 07/11/08 07:07 AM 07/11/08 07:07 AM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	I've never used the vacuum on any of my big block builds. Not to say you can't, just never have.

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