Foreign valve springs in a Magnum

stryker63 said
Well, both books referenced above were somewhat vague about this whole valve lash thing.

It was implied that once the rockers were installed and torqued, then the lash is adjusted. However, I may have mis-read the section. Live and learn, I guess.

Once the rockers are torqued down the "preload" is set. Not the lash. Lash is clearance needed when your using a solid lifter cam. Preload is how much a hydraulic lifter is compressed. They are exact opposites. Just so your clear on that. And the books you read are correct that once the rocker bolts are torqued down the "preload" is adjusted correctly if the pushrods are the right length.

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So, overall, using the "foreign" LS1 springs shouldn't be an issue? I'm still a little confused about that point.

I don't know why the confusion. Springs are springs. Doesn't matter what brand they came off of if they are the correct size. But again as I said earlier you need to find out the spring recomendation for the cam and make sure the LS1 springs are up to snuff.

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Thanks again for all your help.

I would definitely replace all the bolts as it sounds like you did it wrong and probably weakened them. No need to replace the rockers. Just the bolts.

As far as your thinking that maybe you should have gone with Harland Sharp arms what I'd have to say is (and I don't mean this in a mean way) since you didn't know how to properly adjust the stock rockers why do you think you would have done better with the Harland Sharp's? They install the same.