Magnum Heads

73dartsport360 said

I Was Wondering If You Can Use Cheby Rockers On The Magnum Heads?
Has Anyone Ran These Heads On A 360 Combo/408 Etc. I'm Trying To Find Out What Head To Use On My Next Motor Its A 360 Stock Rods And Crank Kb 107 Flat Top Pistons With The Deck Zeroed. I Had 587's Stock On It But I Know There Is More Power To Be Made!
Thanks Brandon

Click to expand...

I just installed the Eddy magnums on my 360/388 combo. yes they use a chevy style individual rocker 1.6 ratio. The Eddys are 58cc and have a double quench pad. The throat runner and bowl finish in stock form is very good. I did some blending at the port inlets and eshaust outlets and cut down the push rod pinch point a bit to hopefully improve flow a bit but otherwise a very good casting finish. I also went with the Eddy magnum Airgap intake and the finish was much better than the LA Airgap I had purchased 3-4 yrs ago - and the fit to the heads was dead on. As I am using a non-roller camshaft - making the pushrods longer - I added a bit of pushrod clearance into the heads just to be sure no binding. With a roller cam (taller lifters) all would e okay.
With flat top pistons @ zero deck and a .040 gasket you will end up with very good quench which should allow more compression and still run pump gas 91-92.
I ended up with 11.8 calculated compression and a final around 10.4 which may be a bit high for straight pump gas. I suggest you target for 10.8 - 11.0
if you go with the Eddy magnums.