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There was a thread recently about drilled stock rotors. I was asked to post pics of mine when I could, so here they are.

Let me start off by saying that they were drilled to the 5 x 4 & 1/2 bolt pattern. The bolt heads that are joining the hub and rotor are drilled in through the head of the bolt on the ends only and not through the shank. The new studs are threaded all the way so they are adding to the integrity of the 2 halves by bolting the two together also. And the guy who did it balanced the assembly also.

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FIAA!

SFPP!

Mine are the same way. Art morrision did mine they seem to work great so far no problems as of yet. Do you like the coilovers or wish you would have stayed with the torsion bars. I have coilovers simliar to yours the sure free up some much needed space.

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Money can't buy happiness, but it can buy horsepower...and that's kind of the same thing...

I bought the truck from a friend of mine with the coil overs already on it. I've had others in the past with the torsion bars and for racing I prefer the coilovers as the tranny access is a lot easier.

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So how would I go about getting mine redrilled to 4.75. Didn't think most places would do this. How much does it cost.
About the coil overs,were do you find them and do they just go were the original shocks go and I assume they support the front of the vehicle ok without much change in front end alignment.
Also are those the hooker headers. I bought some but sent them back because it looked like too much trouble to instal them since my truck was already together. Could probably squezze a few more horses out with them if I had them on.
Thanks, Rick

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Ok litemup, let me try to answer your questions.

The guy who does this locally doesn't recommend drilling to the 4.75 pattern as you have to drill into the shank of a couple of the bolts that mate the two halves.

The local guy charged $65 Machine shop prices in your area may vary.

It's more involved in the coilover conversion than just bolting them in. You have to remove the torsion bars and ideally, fab a new tranny crossmember. It's not too difficult. You can get coilovers from Jeg's, Speedway, etc.

And no those aren't the hooker headers. The tubes are around twice as big on these as the hookers. The hookers aren't that bad to install and you would see some gains over even the best stock GM manifolds.

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Since the cross member is welded to the frame. why can't I just take them out since they just go into the crossmember.. My 350 tranny is already bolted to a newly fashioned mount on the crossmember.
Thanks

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Too much to do and not enough time or money!
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You can. The purpose of removing the factory crossmember is removal of excess weight and more room to work under the truck.

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FIAA!

SFPP!

I looked into this and both the local machine shops who do this state they wont do them anymore do to cracking issues with the rotors over time.
As yours are threaded thru, this may help with the safety of that modification.

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I know that Art Morrision will not do them any more. I like the advantage of coilovers for the clearence and the weight. You can remove the torsion bar crossmember and fab another and save about 20lbs. Mine is simple tubular design. As far as the headers I had to change one tube on a set of headers for a stock 70s camero and I run angle plug heads. Keep in mind there is more room to run a powerglide over a turbo 350.

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Money can't buy happiness, but it can buy horsepower...and that's kind of the same thing...

And the coilover were easy. Make new trans mount and I had to make a little more clearence in the upper A arm but its pretty simple

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Money can't buy happiness, but it can buy horsepower...and that's kind of the same thing...

I see, thanks T. Will have to start working on one for mine then.

_________________
Too much to do and not enough time or money!
Courage is the other side of fear!
Pain is the weakness leaving the body!

What spring rate do you need with a 350/350?

I will check mine and let you know. You will need to go a little lighter mine is a little bouncy. I think for a precise measurement you will need to know how much weight is on each front tire.

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Money can't buy happiness, but it can buy horsepower...and that's kind of the same thing...