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Also, the ratio of the stock Magnum rocker arms is 1.6; the LA motor is 1.5. Account for the difference in lift. I don't know the specs for the 280 cam but for example my cam has .480 lift--with the magnum rockers it is now .501. Just checked, we have the same cam.

Hughes engines has some reasonably priced Magnum spring/retainer options; although not as cheap as the GM springs.

Not to much cam anymore. I pulled the timing cover off and degreed the cam. Originally I installed it with the crank gear on the 4 degrees advance keyway. Changed it to straight up. Vacuum dropped from 15 lbs in neutral to 13.5, idle from 10.5 to 9.5. Messed with the initial timing from 14 to...

I think the first ad was for one head.

..sound performance wise. Howards pn 711021 Intake duration 286 gross & 208 @ .050 with a lift of .430 Exhaust duration 286 gross & 210 @ .050 with a lift of .430 Lobe Separation is 110 Intake Lobe Centerline is ground at 106 RPM Range 1500 to 4800

Darned digital cameras...I'll get new pics if I can find film for my Instamatic and some flash cubes. I thought I had the jetting and idle mixture setup pretty well with the way the plugs look. I'm not sure what springs are in the distributor. FBO curved it based on the info I gave him. I DID...

Okay, tinkered with the car today. First, let me say it was a scorching 50 degrees and overcast. Took the plug out of cylinder 1, cranked it over to TDC. Rotor is pointing to #1 and the plug wire is in the correct spot on the distributor cap. Change the vacuum secondary spring from the...

If the cam is okay, then maybe it is me that is retarded!! I'll get a couple of different size shooters next time I get ready to order from Summit...I can't find squat for Holley parts here in Caldwell. I have the spring assortment, I'll swap to the black spring today and give that a try. I...

The Street Avenger has vacuum secondaries. Messed with the carb many times. I tried power valves 5.5, original 6.5, 8.5 and 9.5. Tried switching the accelerator cam position, changed jets, adjusted the idle screws for maximum vacuum, (15 lbs--rock steady). Now, I don't believe it is card or...

Since they're Magnum heads, I'm pretty much stuck with the 1.6 rockers.

67 Dart, 360 with roughly 9:1 compression, magnum heads, air gap intake, 670 Street Avenger carb, 3.23 gears, 727 and stock converter in a 67 Dart. Last year I swapped out the Edelbrock cam (smaller of the 2 they offer) and put in a Comp Cams 270H (specs .470 lift, .501 with the 1.6 magnum...

FBO lists the heads with either the Magnum or the LA style intake bolt pattern. Looks like $1,000 for complete heads minus the rocker arms.