LT1-LT4 Modifications 1993-97 Gen II Small Block V8

1.7 rockers on stock cam lift?

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Old 01-26-2011, 06:51 PM
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Default 1.7 rockers on stock cam lift?

Stock 1997 LT1 camshafts specs are 200/207 .447/.459 117 LSA if the sticky is correct.

I'm assuming thats with stock 1.5 (if thats what they are) rockers?

I'm going to wait on camming my car I think, so I'm thinking of going with rockers to give me just a little more 'umph'.

1.7 is the biggest I've heard on stock cam (what a couple of guys ran for the bolt-on LT1 records) so that puts lift at .506/,520, correct?

Is that amount of lift safe on stock springs? What are they rated to?
If not, would LT4 springs suffice?

If I have to step up to a bigger spring, I might as well do the cam swap...

And finally, will these fit under trimmed stock valve covers?
I realize it probably depends on the brand.
One more I guess, which valve covers would be the best offer?
I don't care for shiny and can't justify $200 for a set.
Old 01-26-2011, 06:55 PM
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I have springs good for .600 lift retainers locks everything needed, 1.7 scorpions, 7/16 studs and guide plates for sale actually.

But a guy on here who runs 1.7's in a Jag said he had to mod the supports of the valve covers but that they fit under the valve covers.
Old 01-26-2011, 06:55 PM
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I'm overly conservative but I would say the stock springs would fall apart. The hotcam springs could probably do it but who knows how long. If you're going to spend the money on rockers and springs anyway why not just get a hotcam?
Old 01-26-2011, 07:02 PM
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the 1.7 's will destroy the POS stock springs aswell as the rest of the motor...
Old 01-26-2011, 07:04 PM
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i believe i read somewhere that our stock springs are good to .500 ...i maybe wrong but i know i'm close
Old 01-26-2011, 08:10 PM
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Originally Posted by Lawhead
I have springs good for .600 lift retainers locks everything needed, 1.7 scorpions, 7/16 studs and guide plates for sale actually.

But a guy on here who runs 1.7's in a Jag said he had to mod the supports of the valve covers but that they fit under the valve covers.
I don't think they will fit under the stock cover because they are not a narrow body rocker. I run the tall Proform 141-131 covers myself.
Old 01-26-2011, 09:33 PM
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Originally Posted by lt1-xjs
I don't think they will fit under the stock cover because they are not a narrow body rocker. I run the tall Proform 141-131 covers myself.
oops thought I had seen you had these under stockers

MY B
Old 01-26-2011, 09:51 PM
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Old 01-26-2011, 09:53 PM
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Lawhead: how much for it all?
Old 01-26-2011, 09:59 PM
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What brand are the 1.7 rr? Are they shaft mount?
Old 01-27-2011, 05:28 PM
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By the way, the stock 1993-1996 Corvette Valve covers are said to clear those no problem.

Plus they look 10x better.

If anyone has some, I would be in the market =)

https://ls1tech.com/forums/lt1-lt4-m...-them-fit.html
Old 01-30-2011, 08:09 AM
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The stock springs can not take a 1.7rr. 1.6rr put it on the edge of coil bind and a high mailage LT1 will have weaker springs
Old 01-30-2011, 08:25 AM
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The stock springs with miles on them are not enough for stock rockers on a stock cam, they float.

I would not do 1.7s because later on you will probably go back and buy 1.6s to match whatever cam you do go with. Buying things twice is a great way to waste money.

Trimming will fit about anything shy of shaft mounts under stock valvecovers again saving money.



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