Generation III Internal Engine 1997-2006 LS1 | LS6
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Old 03-31-2006, 06:18 AM
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I hope you are not right. I am trying a set of 7.4's tomorrow.
Old 04-03-2006, 03:13 AM
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Well, I put in the stock lenght push rods and it runs better but is making noise. I am stumped on this one. I need a pushrod somewhere between 7.400" and 7.425".
Old 04-03-2006, 07:48 AM
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I think you need to get a p-rod checker and measure.
Old 04-03-2006, 08:11 AM
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I agree .025", should certainly not bottom out the lifter....which is what would have to happen for the valve to be kept open. I do not think your problem is one of pushrod length. The 7.40 or 7.425 should result in the same engine performance. Unless the heads are milled and you didnt realize it. Measure to verify.....
Old 04-03-2006, 09:57 AM
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So with a cam like this 7.425's are the only way to go right?
Old 04-03-2006, 10:30 AM
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any cam that has a 1.45x base circle with unmilled heads/stock gasket setup
(IE: Cam only swaps)
Old 04-04-2006, 02:50 AM
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Originally Posted by PREDATOR-Z
I think you need to get a p-rod checker and measure.
I agree. I am tired of spending money on pushrods that do not work. Now I heard that stock pushrods are a little shorter than 7.400". The 7.425" were definitely bleeding off cylinder pressure because now the car runs alot better and I also verified it with the compression tester.
Old 04-04-2006, 05:32 AM
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Man, the only way 7.425 would bleed cylinder pressure is if they collapsed the lifter.
You have hydraulic lifters and .025 inch CANNOT have the effects you say.
You're beating around the wrong bush.
Do a leakdown test.
Old 04-04-2006, 11:11 AM
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stocks are turely 7.3975 I think.




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