Stu5766 394 Posted June 12, 2017 Good afternoon people. Looking for people's advise on setting up the fuel & spark on the clevo. As it will be a few weeks till I am able to dyno it. 351 clevo with about 10.8:1 comp Closed chamber heads with port work & roller rockers Solid F246 crane cam 4 into 1 extractors with twin 2.5 system Air Gap manifold with 1" spacer 750 HP center DP proform carby MSD dizzy currently set at 12* with 18* mech advance its backed up by a toploader & 3.9 LSD 9" diff. advised on jets, power valve & timing would be aprciated. thanks in advance. Share this post Link to post Share on other sites
gerg 10,871 Posted June 13, 2017 750 DPs come with 73 jets, so that's a good place to start.Squirters are 31 stock but I reckon a snappy combo like yours with manual box needs 35s and a blue pump cam. Don't go green or pink unless you have the 50cc pump diaphragm.Power valve number is almost always 1/2 of your idle vacuum. So if it's a pretty hairy idle, say 8" hg, go with either 4.5 or 3.5. Your call on that one, but the ultimate aim is to use as low a number as possible without getting a flat spot coming onto load.Closed chamber heads can take some decent timing, what you're running should do OK, try dialling a bit more in and see how she goes, say 4 deg.FYI my little 302 with closed chambers runs best with timing all in at about 35 on load. That's with a 204/214 @ 0.050" hyd cam and 9.4:1 comp.Sent from my CPH1607 using Tapatalk Share this post Link to post Share on other sites
