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578 ci big block 914 hp 850 tq old weight w/ladder bar was 2880 52% front 48 rear, weighing everything in and out looks like weight should be same.

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In that case I'd use a base line of 56 long and 3 up

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I would have some wheelie bars on it first time out. you don't want to put it on the bumper. I would go with the longer of the 2.

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I'd start with the longer set up... it
might be a little conservative but that me

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When moving the bars do you move one bar at a time. adjust hiems so bolt slips in tighten jam nuts and then move to next bar, or move bar and force housing into postion so bolt goes in? I know this sounds stupid but remember I have never worked on a 4 link suspension and my bickle book doesnt say. JOhn

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Once you get the rear end into position then each bar
has a purpose... the 2 lower bars set your length
the top left sets the pinion angle, then the top
right is for setting pre-load. When you want to
change IC lengths and heights the first thing is
to get the pre load bar back to 0(bolt slips in and
out)... you always have 3 bars in place unless you
want to have the rear roll on you, one at a time
you
move each bar to the new hole, lengthening or shortening
the heim as needed.... once all the bars are in the
new holes measure the rear for being square(I use
my front 4 link cross bar), next is to check the
pinion angle... once these are set then tighten
down the bolts and lock nuts.... leaving the pre load
for the last thing... then set it back to what it
was before(1/2 turn or what ever). When we talk
pre load we USUALLY talk flats, thats the flat of
the hex on the bar. IF the car launches but goes
slightly right... you need to add pre load this
means SHORTEN the top right bar... we might say
give it 1 more flat.... if the car goes left you
have too much pre load OR you might need to go
negative pre load.... this is when you lengthen
the top bar...... there ya go now you are just like
the rest of us 4 link guys... time to test

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Ron, maybe you can give JKwedge some suggestion for
his set up. But wedge will you be hitting any spray
off the line and will you be using a progressive timer
for the spray. Also what do you figure the bias is
for the weight and do you know the CG of the car

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