Learn me the Super Duty 4 (Page 3/3) GTaylor SEP 25, 08:27 PM quote Originally posted by Will: Going to need a 3.0 shortblock turning 7000 RPM and a big ruppity rump cam to take advantage of that flow. A stock Iron Duck block will not survive that. I helped build a stock block aluminum headed dirt engine once. The head was off a Jeg's drag car. We used 6" small journal SB Childs & Alberts rods, also used from Jeg's, narrowed .076". Well 7 rods as one fell out of their motor on the starting line. Yes we drilled the stock block for 1/2" studs. BUT PAY ATTENTION TO ME!!! The instructions with the stud kit tell you tp drill, from memory 1.5" deep, but if you do that on the stock block you will break through into the lifter gallery. Think water in oil. So you only drill to bottom of hole on the holes next to lifter gallery. Then shorten studs about 4 threads. You have to machine/narrow SB rod bearings also. I think we used 455 Pontiac pushrods? Flat tappet cam form Ultradyne. Big block chevy rockers although they weren't the recommended ratio for the cam. BB is 1.7, cam grainder said 1.55. The 1.55 were custom order at that time and EXPENSIVE. Diamond pistons. Don't have any info on valves/springs/retainers as they came with head. You MUST remove the oil filter bypass valve or it will get pushed up into oil gallery starving bottom end bearings...don't ask how i know. Will SEP 26, 11:48 AM Was that a stock Fiero block? There are prior applications of the Iron Duke that may have stronger blocks (and the Chevy bellhousing pattern) edfiero SEP 26, 01:51 PM quote Originally posted by Will: Was that a stock Fiero block? There are prior applications of the Iron Duke that may have stronger blocks (and the Chevy bellhousing pattern) If there is any stock block that is stronger than the others (though all are weak), it would be the later not earlier ones from the S-10. http://ironduke7.tripod.com/dukefaq.htm GTaylor SEP 26, 11:05 PM quote Originally posted by Will: Was that a stock Fiero block? There are prior applications of the Iron Duke that may have stronger blocks (and the Chevy bellhousing pattern) Nope. AMC Spirit. Everybody was running Pintos and Mustangs. Owner of car liked being a renegade. But those Esslinger 2.0 Ford were tough to beat. Will SEP 27, 08:39 AM I've driven one with a 258 and 4 speed. Also the Eagle SX/4. I did the engine/diff mounts for a small block Chevy into an Eagle... now my dad needs to do the exhaust, oil pan & transmission like he said he was going to...