Timing advance
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New User
Joined: Oct 2018
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Timing advance
I just finished getting my 400 back together, I put a performer cam and timing set in among various other upgrades. Now I read the paperwork for the cam and timing set many times, but when it cam time to install everything I opted for the advance position for the timing set. In the paperwork for the timing set it says if using the performer cam to install it straight up. Most people end up with 15-25 total advance, is setting the cam with the supposed 4 degrees advance going to damage anything? The engine is back in the truck but nothing else is done yet so If I need to change it, now would be the time. Thanks for any help
Logistics Pro
Joined: May 2015
Posts: 4,468
Likes: 962
From: Tri Cities, TN
Don't know what your cam specs are and I'm guessing you didn't use a degree wheel to check the timing. By advancing it you decrease the intake valve clearance. You also increase the cranking compression. But if you are running stock pistons you should be ok. The best think to do is call their tech line and talk to them.
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New User
Joined: Oct 2018
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It's the performer plus camshaft from Edelbrock,. I do not have a degree wheel, need to get one. I do have a timing light. When I set up the distributor, I had the valve cover off, ran the engine over by hand and got both valves closed with the number one piston all the way to the top. Then put the distributor in and got the center of the rotor pointed at the contact on the cap number 1. The cam timing is listed as intake open 5 degrees after tdc, close 29 after bdc. Exhaust open 44 before bdc close 10 before tdc. Since we can adjust the distributor, can I turn it to remove the extra 4 degrees? If not I will have to change it, better now than trying to figure out what's wrong later.
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
Valve timing and ignition timing are completely different things. Yes, the distributor is driven by the cam but that's about the extent of it. Can't compensate the valve timing by changing the ignition timing.
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