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#1 |
Registered User
Join Date: Apr 2012
Location: san luis obispo, ca
Posts: 21
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msd pro billet spring setup
Hello everyone i'm in the process of setting up my distributor and i was curious as to what a good spring and bushing set would be?
sbc 388 9:5.1 sportman 2 heads, rpm air gap,msd 6al, 3" exhaust, Quadrajet th400 3000 stall in a 1961 chevy truck. |
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#2 |
At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,211
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Re: msd pro billet spring setup
My similar 406 likes all in by 3500 36° total
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" That didnt make it any newer " " Dont antique the equipment " |
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#3 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: msd pro billet spring setup
I run an 18* bushing and the second quickest curve.
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#4 |
Registered User
Join Date: Oct 2008
Location: great falls, mt
Posts: 82
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Re: msd pro billet spring setup
one weakest spring and one middle spring...
depending on how much initial your cam likes ( i run about 17 initial, 18* bushing for a total 35 degrees.) alot of people run less initial. in which case use 21 or 23?? bushing to get around 34-36 degrees total. use timing tape (appropriate for your size balancer) if you don't have aftermarket balancer. try to have all in by 3000. |
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#5 |
Registered User
Join Date: Oct 2008
Location: great falls, mt
Posts: 82
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Re: msd pro billet spring setup
most aftermarket heads with modern efficient combustion chamber will do with less timing. vortecs also. 32-33 is fine in most cases.
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#6 |
Registered User
Join Date: Oct 2008
Location: great falls, mt
Posts: 82
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Re: msd pro billet spring setup
didn't see sportsman heads. 34-36 would be best.
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#7 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: msd pro billet spring setup
I would run as much timing as possible till it detonates then back it off
Also you may want to limit vac advance so it doesn't get to much timing under load or cruising.
__________________
377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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