mopar head
Well-Known Member
Im downsizeing a powervalve, street avenger, where the heck is the powervalve located? under acellerator pump or do I need to pull fuel bowl? primary or secondary? I cant find a blown view anywhere. thanks:read2:
primary bowl right? also I have new bowl gaskets for 750 dbl pump, will these work on the avengers? when I ordered it I was assumeing it was under accel. pump. dummy meTry Holley.com fro a explode veiw.
The power valve is in the bowl, er, behind it.
Take off the bowl and see it.
what little I read I was thinking secondary bowl too? help. lolThe power valve should be in the secondary metering block if memory serves me.
he he, well I was afraid...... of screwing up gaskets, unnessarily. Took off secondary bowl, no valve, but saved gasket, same with pump. it`s behind primary, saved block gasket, but bowl gasket tore to heck. the 750 gaskets are the same, so, good to go. I`ll test drive tomorrow, see if it helped. tryen to lean her out a little @ wot.8)
So true. Just something that needed to be part of my tuneing attempt, 12" vacume@ idle, put in 5.5, it seemed to improve cruise to accelerate better? Since I got a few of you guys attention, maybe you can help me out. I`m trying to lean out a ritch idle, plugs seem ok@ cruise and a hard run. but recently I wound it out a little @ night and could see a pretty good fume trail in the dissapearing headlights behind me, cant tell in daylight. I`ve experamented with the heaver secondary spring, seemed to lost some quickness via butt dyno, so I replaced the factory silver spring. As far as idle I`ve adjust needle valves to where the engine ran its highest rpm then brought it back down with curb screw. = pretty ritch. should I lean it with needles and crank up the curb? out of box specs, as follows- primary jets=72 sec. = 75, .025 discharge nozzle, 65 powervalve/ allready replaced with 5.5. Plugs to me look decent with exception of fuel/and or oil blowby. Engine is 69 340 x heads, .030, over rebuild. tti headers, MP ign. conversion. eddy rpm airgap. 770 street avg., 323 8-3/4sg. I`ll post cam card and plug pic. any tuneing tips/tricks will be much appreciated8)Changing the power valve will not lean it at wot. You need to change the jets or rear metering plate/jets to lean it out.
The power valve number determines its opening point. At the vacuum level of 6.5 inch, the 6.5 P V will start to open. At wot there is no measurable vacuum. Thus any power valve will be open at wot.
about 12- 34 seems to run its best. Advance plugged. 340 as posted earlier. I did have a total mopar nut from NC,take a ride, said it sounds like I have lazy timeing? you thinking timeing? thanks:clock: I`ve never had it recurved, will need proper procedure on that if I do.How timing are you running? I need both initial and total without vacuum advance. Also, what displacement engine are you running?