distributor~ LARS HELP
Thread Starter
Instructor
Joined: Mar 2006
Posts: 246
Likes: 1
From: west melbourne florida
distributor~ LARS HELP
i have an msd 8365 and want to dial it into to my vett the engine is a 9.5.1 compression 350 275 hp with edelbrock dual plane intake edelbrock 600 cfm carb. my advance stop bushing is set to 21 degrees my vacume advance is set at 10 degrees with 15 lbs of vacume and my initial vacume is at 14.5 degrees. what should i change to get more power, and she runs hot help
Drifting
Joined: Sep 2004
Posts: 1,959
Likes: 1
From: North Bend Ohio
If you have regular cylinder heads (as opposed to fast burn) you should shoot for 36 degrees total. You will need 15 degrees initial to get there. This should be all in at about 2800 RPM. If you can find a vacuum can that will give 14 degrees advance it will help the heat problem. Hook it up to manifold vacuum.
BigBlockk
Later.....
BigBlockk
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Le Mans Master
Joined: Dec 2007
Posts: 6,422
Likes: 591
From: McHenry Illinois
This is the best and most thorough answer I have come accross for timing.
http://forums.corvetteforum.com/show....php?t=1430339
http://forums.corvetteforum.com/show....php?t=1430339
Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,391
From: At my Bar drinking and wrenching in Lafayette Colorado
Make sure you set the total timing to 36. With your 21-degree curve, this should get you about 15 degrees initial. Install a set of soft springs that will get the full curve in no later than 2800 rpm. Your vacuum advance is too stiff - get a unit that pulls in its full advance at about 13 inches of vacuum (vacuum is not measured in pounds). The VC1765 would be well matched for your application. Run it off manifold vacuum. 
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Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,391
From: At my Bar drinking and wrenching in Lafayette Colorado
Most of the MSD distributors use the short, points-style vacuum advance. If you have an HEI-style large-diamater distributor, you need to use the HEI style vacuum advance. You can run part number VC1838 to get 14 degrees of advance all-in at 10 to 12 inches of vacuum, or you can run the L82 Vette High Performance vacuum advance part number VC1703 to get 10 degrees of advance at 9 inches of vacuum.
Lars
Lars