Bloose said:
Dyno,
What about the Scorpion Pedistal mount BBF rockers?
B-loose
Ok guys, here's what I found from several trips to a few junkyards. I checked the; Ford 460, 300ci. I-6, 351w, GM 151ci 4cyl "Iron Duke", 250ci I-6, SBC, AMC 360, and a few others. I found that the V8 rocker arms were more compact than inline rockers. This is due to the fact that most V8 heads have the valves canted towards the intake manifold. And the pushrods are usually angled towards the valves, leaving less room for the rocker arm itself to take up. As with the traditional inline engine, most of them have the valves oriented perpindicular to the cylinder head, and the pushrod angles are near vertical also. Making more room for the rocker arm to fill between the pushrod,fulcrum, and valve tip. I first found some 460 BBF rockers and they looked to be on the short side as compared to the 4.0 rocker. They also posed the 7/16 stud issue, so I favored them out. Then i found a 360ci AMC in a older Wagoneer. They are the right ratio and fit the 4.0 pivot, but again they were too short! These were the only V8 rockers that I could find that were remotely close, all the rest were far too short. As for the inline rockers, it looks as though all of them would be happy on a 4.0 head. After doing a mock setup on my project HO head, I found that all of them would be compatible dimension wise. All of the inline motor rockers were stud mounted. The Ford I-6 and the GM I-6 rockers were already sitting on 3/8 studs. The GM I-4 151ci./2.5L rockers were mounted on metric studs, but used to be mounted on 3/8 studs (pre 1982 or so). As for ratios, the Ford rockers are 1.6, the GM I-6 are 1.7, and the I-4's are 1.6. I know that roller rocker arms for the inline sixes are quite spendy. So here's what I found! The rockers for the 151 inline 4 fit the 4.0 head the best as far as rocker to valve tip contact. I did some research and and found that Scorpion makes a Roller for this motor in 1.5 and 1.6 ratio both 3/8 stud mount pn#SCP1076 and SCP1078 at
www.flatlanderracing.com/scorpionrockers.html Better yet, a set of 8 they're selling for $105!! Now, i'm not sure if you can purchase singles or odd numbers of them but it's worth a try. If we can use these rockers along with some 5/16-3/8 rocker studs and slight milling, then I can't find any reason why it wouldn't work. If all you wanted was more lift, then you could setup the head for 3/8 studs, and get some stock 1.7 rockers and pivots for a GM I-6 (194 ,230 ,250 ,292) and there you have it! No messin with pushrod length! Again, this is all in my head an not proven yet, but valvetrain ain't rocket science!
FUNKYTEE