Hi all.I am trying to set up my timing after my HEI died. I brought a MSD 8360 in view for future engine up-grades!I have a sbc 327 with my reconditioned 283 heads.YES i know not the best,as my 283 ate the crank and we got a deal on a 327 that we rebuilt minus the heads as they were too far gone.
At the moment i have 12 initial and a total of 32 degrees with vacuum plugged.My tachometer died so rpm by ear!I have tried many of the timing set ups and have narrowed it down to 2 settings of advance springs.Trouble is the car feels flat at higher rpm!Is this because the advance timing is coming in way late according to the MSD chart (over 3500rpm)... Yes i know ...the heads!!!Oh and the cam is a Comp Cams CL12-206-2 if that helps.
Many thanks,
Philip
https://www.jegs.com/i/COMP-Cams/249/CL12-206-2/10002/-1
a flat tappet hydraulic cam designed to produce power in the 1500 rpm-5200 rpm power band,
may not be ideal in a short stroke engine that can in theory easily spin 7000 plus rpm,
Id try verifying the ignition timing ,certainly, and ideally post pictures of your spark plugs as a good deal about the combustion and timing can be seen on clear color pictures of spark plugs
id verify TDC and the timing,
but the issue of no power over 3500 rpm may be throttle linkage,related,
(not fully opening)
carb jetting ,
float level,
fuel delivery
,tuning, or ignition timing advance curve, related, it
may be fuel delivery, or weak valve springs or a worn cam,
a restrictive intake or exhaust system,
or several other factors, all must be checked and verified.
read links
http://garage.grumpysperformance.com/index.php?threads/verifying-your-real-advance-curve.4683/
http://garage.grumpysperformance.com/index.php?threads/finding-top-dead-center.967/
http://garage.grumpysperformance.com/index.php?threads/is-backpressure-hurting-your-combo.495/
http://garage.grumpysperformance.com/index.php?threads/setting-up-your-fuel-system.211/
http://garage.grumpysperformance.co...e-springs-and-setting-up-the-valve-train.181/
http://garage.grumpysperformance.com/index.php?threads/carb-tuning-info-and-links.109/
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