stock lifters w/ 977 springs ok???
04-12-2004, 07:43 PM
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stock lifters w/ 977 springs ok??? will i have problems if i keep my stock lifters after installing my new heads that are comming with comp 977 springs?
04-12-2004, 08:07 PM
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Originally Posted by SPANKY LS1
Yes, Comp "R"s are required. The spring pressure will collapse a stock lifter.
Shawn
Shawn
From new lifters to SVO30lb injectors. Oh well i guess i should of thought about this more in detail and once i get my A/S 5.3 stg2.5 heads and bolt them on with the LSX and these other goodies i'll forget about the added cost's 
04-12-2004, 09:48 PM
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won't be any valve float till 8K rpm's? Those springs and lifters are badass...just make sure ur pushrods are TOTL also and you'll be alright.
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04-12-2004, 11:26 PM
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comp R require adj rocker arms... the spec are for something like .004 preload...
no way u will get that with stock rocker arms and 7.4s ... some people shim the rockers but as discussed before here u change the valve train geometry... it is possible some people have done it without Adj R/A but u are in for a world of **** if it doesnt work out... valve float... broken lifter if u have to much preload... etc.
If u do get an adj R/A the Pushrod Holes on the heads have to be elongated for the new geometry... and u have to run V/C spacers...
good luck... my friend just told me he had 977s on his heads after I put one on already... so off it comes. and now he either has to put new springs on or adj PRs and all the jaz above
no way u will get that with stock rocker arms and 7.4s ... some people shim the rockers but as discussed before here u change the valve train geometry... it is possible some people have done it without Adj R/A but u are in for a world of **** if it doesnt work out... valve float... broken lifter if u have to much preload... etc.
If u do get an adj R/A the Pushrod Holes on the heads have to be elongated for the new geometry... and u have to run V/C spacers...
good luck... my friend just told me he had 977s on his heads after I put one on already... so off it comes. and now he either has to put new springs on or adj PRs and all the jaz above
04-13-2004, 12:05 AM
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Originally Posted by T/A Medic
comp R require adj rocker arms... the spec are for something like .004 preload...
no way u will get that with stock rocker arms and 7.4s ... some people shim the rockers but as discussed before here u change the valve train geometry... it is possible some people have done it without Adj R/A but u are in for a world of **** if it doesnt work out... valve float... broken lifter if u have to much preload... etc.
If u do get an adj R/A the Pushrod Holes on the heads have to be elongated for the new geometry... and u have to run V/C spacers...
good luck... my friend just told me he had 977s on his heads after I put one on already... so off it comes. and now he either has to put new springs on or adj PRs and all the jaz above
no way u will get that with stock rocker arms and 7.4s ... some people shim the rockers but as discussed before here u change the valve train geometry... it is possible some people have done it without Adj R/A but u are in for a world of **** if it doesnt work out... valve float... broken lifter if u have to much preload... etc.
If u do get an adj R/A the Pushrod Holes on the heads have to be elongated for the new geometry... and u have to run V/C spacers...
good luck... my friend just told me he had 977s on his heads after I put one on already... so off it comes. and now he either has to put new springs on or adj PRs and all the jaz above
what's a comparable spring that does'nt take close to a GRAND to use?? I think there has to be a way to get a real good spring set up that does not require this many other mods just to use
04-13-2004, 12:45 AM
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Originally Posted by destroyerSS
This sounds like a nightmare waiting to happen what's a comparable spring that does'nt take close to a GRAND to use?? I think there has to be a way to get a real good spring set up that does not require this many other mods just to use
what's a comparable spring that does'nt take close to a GRAND to use?? I think there has to be a way to get a real good spring set up that does not require this many other mods just to use
) if/when i ever get to sleep, all im going to do is dream about this !@#$ing nightmare ALL NIGHT...... i sure hope that all i have to do is buy a set of dual springs that will hold up to stock lifters (if there IS such a thing 
)
04-13-2004, 03:05 AM
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Originally Posted by dame
Well i AM the "nightmare waiting to happen" (Im the guy that just told his friend T/A medic that i have 977's- after seeing this thread ) if/when i ever get to sleep, all im going to do is dream about this !@#$ing nightmare ALL NIGHT...... i sure hope that all i have to do is buy a set of dual springs that will hold up to stock lifters (if there IS such a thing )
) if/when i ever get to sleep, all im going to do is dream about this !@#$ing nightmare ALL NIGHT...... i sure hope that all i have to do is buy a set of dual springs that will hold up to stock lifters (if there IS such a thing )we can use those 918s for now... change it again later...
04-13-2004, 08:56 AM
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Originally Posted by Jammer
We are using 977 with Comp R's and stock rockers... Were also using 987 with Comp R's and stock rockers . Each w/ 1.7350 P-Rods.. in 500 + HP motors.
thanks for any info you can give .... (what size motors are these??)
thanks,
Crowley
04-13-2004, 10:19 AM
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come on you guys, it's not that hard to shim the rockers. sure, it takes a little while to get it right, but it's not like you have to set them up more than once. do it once and do it right.
04-13-2004, 10:58 AM
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Originally Posted by KGSloan
come on you guys, it's not that hard to shim the rockers. sure, it takes a little while to get it right, but it's not like you have to set them up more than once. do it once and do it right.
thanks,
Crowley
04-13-2004, 11:15 AM
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i have the 978's on my setup and stock lifters. i did have to shim to get the preload right (it was off by about 1 full turn). i've shimmed on a buddies car with 977's and comp r's as well. it takes a little while to get the preload right. you have to keep messing around with the shim thickness until you get it just right. put shim on, check preload and adjust shim thickness accordingly. do this until you get it within 1/4 of a turn or preload.
it's a little bit of a pain but once it is all setup you are good to go with a very reliable valvetrain
it's a little bit of a pain but once it is all setup you are good to go with a very reliable valvetrain
04-13-2004, 11:18 AM
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Originally Posted by KGSloan
i have the 978's on my setup and stock lifters. i did have to shim to get the preload right (it was off by about 1 full turn). i've shimmed on a buddies car with 977's and comp r's as well. it takes a little while to get the preload right. you have to keep messing around with the shim thickness until you get it just right. put shim on, check preload and adjust shim thickness accordingly. do this until you get it within 1/4 of a turn or preload.
it's a little bit of a pain but once it is all setup you are good to go with a very reliable valvetrain
it's a little bit of a pain but once it is all setup you are good to go with a very reliable valvetrain
04-13-2004, 11:22 AM
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Originally Posted by 94form2000z
Didn't know the stock lifters had a specific preload like the CompR's do
they don't really. they are supposed to be (from what i have read) between 3/4 and 1 full turn. when i first bolted down the heads they were at 1 3/4 of a turn. i shimmed them and got them to 3/4 of a turn. obviosly they have a wider opperating range than the comp r's but my lifters definetly had too much preload and needed to be adjusted.