LQ9 + TR224 = Stock Length Pushrods???
10-02-2005, 08:44 PM
#11
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hmmm. see now i was under the understanding that stock ls6 pushrods were 7.4 while truck's were 7.375 therefore needing hte step up to 7.4 with any bigger cam due to the base circle. Are we under the concensus now that we need 7.425 pushrods for all of tr's cams. And if you buy TR 7.4" pushrods, you're actually getting 7.43" rods?
can we get another first hand measurement or experiance here? ( not doubting you 99silver5.3, just looking for more evidence )
i bought a set of comp 7.4's and now i'm wondering if when i do my cam, i need a different set.
can we get another first hand measurement or experiance here? ( not doubting you 99silver5.3, just looking for more evidence )
i bought a set of comp 7.4's and now i'm wondering if when i do my cam, i need a different set.
10-02-2005, 11:47 PM
#12
I'm dying to know the outcome of this...seems everything I read points towards wanting to use longer (7.425) pushrods to compensate for the smaller cam base circle of most aftermarket cams, but most of the manufacturers recommend 7.4's as part of their set...when you buy a cam and spring set from Thunder, they show 7.4 pushrods in the listing...do they mean 7.425?
Comp has different lengths to choose from, but when I did my baby cam they recommended the 7.400 pushrods to me. I wonder if I would have gone with a 7.425 if I wouldn't be hearing half of the ticking and clacking that I hear in the valvetrain
Comp has different lengths to choose from, but when I did my baby cam they recommended the 7.400 pushrods to me. I wonder if I would have gone with a 7.425 if I wouldn't be hearing half of the ticking and clacking that I hear in the valvetrain
10-03-2005, 12:14 AM
#13
Originally Posted by LoudAzzLoStepside
hmmm. see now i was under the understanding that stock ls6 pushrods were 7.4 while truck's were 7.375 therefore needing hte step up to 7.4 with any bigger cam due to the base circle. Are we under the concensus now that we need 7.425 pushrods for all of tr's cams. And if you buy TR 7.4" pushrods, you're actually getting 7.43" rods?
can we get another first hand measurement or experiance here? ( not doubting you 99silver5.3, just looking for more evidence )
i bought a set of comp 7.4's and now i'm wondering if when i do my cam, i need a different set.
can we get another first hand measurement or experiance here? ( not doubting you 99silver5.3, just looking for more evidence )
i bought a set of comp 7.4's and now i'm wondering if when i do my cam, i need a different set.
10-03-2005, 12:34 AM
#14
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I was told that 6.0 rods are running a 7.4 length stock from the factory. Right know I am running 7.35 pusrods with the Tr224 due to the lift of the cam. But I also have shaved .030 of my heads. I will measure tommorrow and see what the exact length on the pushrods are.
10-03-2005, 12:58 AM
#15
Originally Posted by desTRUCKtive
I was told that 6.0 rods are running a 7.4 length stock from the factory. Right know I am running 7.35 pusrods with the Tr224 due to the lift of the cam. But I also have shaved .030 of my heads. I will measure tommorrow and see what the exact length on the pushrods are.
10-03-2005, 03:31 AM
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ok, i couldn't sleep on this one so i've done some more research and have come up with a few things.
1. Stock ls1/ls6 pushrods are variant in length from 7.38-7.395 ( rumor is saying trucks are the low number due to milder cams )
2. most aftermarket cam manufacturers recommend 7.4 ( but they dont' tell you this is with their lifters )
3. running a 7.425 is within tolerance and adds a lil more lifter preload which the stock lifters like with aftermarket valvesprings, quieting valvetrain at low rpm
4. thunder racing 7.4" pushrods are actually longer, more like 7.425-7.430
so in summary, after about an hour of reading threads on ls1tech, my reasoning, depending on stock pushrod length ( variable ) is that 7.4 is correct and will work. 7.425 is within limits and/or is correct and may help quiet the valvetrain down. TR 7.4's make life easy if you like the easy way out.
if you want to do it right, get a pushrod length checker for 20 bucks, and order the right size.
1. Stock ls1/ls6 pushrods are variant in length from 7.38-7.395 ( rumor is saying trucks are the low number due to milder cams )
2. most aftermarket cam manufacturers recommend 7.4 ( but they dont' tell you this is with their lifters )
3. running a 7.425 is within tolerance and adds a lil more lifter preload which the stock lifters like with aftermarket valvesprings, quieting valvetrain at low rpm
4. thunder racing 7.4" pushrods are actually longer, more like 7.425-7.430
so in summary, after about an hour of reading threads on ls1tech, my reasoning, depending on stock pushrod length ( variable ) is that 7.4 is correct and will work. 7.425 is within limits and/or is correct and may help quiet the valvetrain down. TR 7.4's make life easy if you like the easy way out.
if you want to do it right, get a pushrod length checker for 20 bucks, and order the right size.
10-03-2005, 09:29 AM
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Originally Posted by 99Silver5.3
4.8, 5.3, 5.7(LS1 & LS6), 6.0 all have 7.4" from the factory.
I dont know I will measure both of them. I am not saying you are wrong but, I heard that 4.8 and 5.3 run the 7.5 and the 6.0 7.4.