ballpark length of pushrods??
03-15-2008, 08:44 PM
#1
ballpark length of pushrods?? With a combination of the following:
AFR 205 heads milled to 62 cc
.040" cometic head gaskets
AFR 224 228 114 cam
stock 35,000 miles lifters
yella terra 1.7 ultralite rockers
what would be an optimal pushrod length, or atleast one that would put me close? ex: 7.4, 7.45, or 7.5 etc
AFR 205 heads milled to 62 cc
.040" cometic head gaskets
AFR 224 228 114 cam
stock 35,000 miles lifters
yella terra 1.7 ultralite rockers
what would be an optimal pushrod length, or atleast one that would put me close? ex: 7.4, 7.45, or 7.5 etc
Last edited by vader99; 03-16-2008 at 01:56 PM.
03-16-2008, 11:18 AM
#2
I'm using the same parts except for the YT rockers. I ended up running 7.35" PRs.
I thought the car was a little noisy with those, a little louder than stock valve train. So I picked up a set of 7.375", thinking it might quiet it down.
But everyone thought my VT noise with the 7.350" was normal for a car with my mods, so I decided to stick with the 7.350". I haven't had a problem and either the additional VT noise went away or I don't notice it anymore.
I measured with a PR length checker:
https://ls1tech.com/forums/showthrea...222&highlight=
I thought the car was a little noisy with those, a little louder than stock valve train. So I picked up a set of 7.375", thinking it might quiet it down.
But everyone thought my VT noise with the 7.350" was normal for a car with my mods, so I decided to stick with the 7.350". I haven't had a problem and either the additional VT noise went away or I don't notice it anymore.
I measured with a PR length checker:
https://ls1tech.com/forums/showthrea...222&highlight=
03-16-2008, 01:58 PM
#5
I was just wondering if the yella terra 1.7 ultralites would mean needing a different length pushrod than the normal range ----I have heard of 7.5" pushrods with this type of combination but I wanted more input. I already have 7.4" ones.
03-16-2008, 02:34 PM
#6
Here's some info on YT rocker installation.
http://ls1howto.com/index.php?article=21
From there, I would then measure PR length with a PR length measuring tool and select a PR length that will put you at the correct amount of lifter preload (~0.080" for stock lifters.).
(I'm assuming your YT rockers are non-adjustable.)
http://ls1howto.com/index.php?article=21
From there, I would then measure PR length with a PR length measuring tool and select a PR length that will put you at the correct amount of lifter preload (~0.080" for stock lifters.).
(I'm assuming your YT rockers are non-adjustable.)
03-16-2008, 02:57 PM
#7
Ya, the yella terra 1.7 ultralites will be nonadjustable.
The thing that annoys me with getting the correct pushrod length with a pushrod length checking tool is that you have your car all apart and then you are trying to get it all back together but you can't buy the correct pushrods until your have the heads and rockers all mounted. Then, you have to measure the length and then order them and your head/cam project is stalled until the pushrods come. This scenario sucks when you only have garage space available for a few days to do the install.
I suppose I could run with the 7.4's until the correct ones come in the mail.
The thing that annoys me with getting the correct pushrod length with a pushrod length checking tool is that you have your car all apart and then you are trying to get it all back together but you can't buy the correct pushrods until your have the heads and rockers all mounted. Then, you have to measure the length and then order them and your head/cam project is stalled until the pushrods come. This scenario sucks when you only have garage space available for a few days to do the install.
I suppose I could run with the 7.4's until the correct ones come in the mail.
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03-16-2008, 03:07 PM
#8
Ya, the yella terra 1.7 ultralites will be nonadjustable.
The thing that annoys me with getting the correct pushrod length with a pushrod length checking tool is that you have your car all apart and then you are trying to get it all back together but you can't buy the correct pushrods until your have the heads and rockers all mounted. Then, you have to measure the length and then order them and your head/cam project is stalled until the pushrods come. This scenario sucks when you only have garage space available for a few days to do the install.
I suppose I could run with the 7.4's until the correct ones come in the mail.
The thing that annoys me with getting the correct pushrod length with a pushrod length checking tool is that you have your car all apart and then you are trying to get it all back together but you can't buy the correct pushrods until your have the heads and rockers all mounted. Then, you have to measure the length and then order them and your head/cam project is stalled until the pushrods come. This scenario sucks when you only have garage space available for a few days to do the install.
I suppose I could run with the 7.4's until the correct ones come in the mail.
03-16-2008, 04:53 PM
#9
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Do not run the 7.4's untill yu get the right ones. I would say the 7.35's, but not sure with the YT rockers. My set up is AFR 205's Milled 0.030, stock GM gasket, LS7 lifters & a 7.35 pushrod. Stock rockers.
03-16-2008, 05:38 PM
#10
I am installing AFR's as well. I can tell you right now if you don't check your wipe pattern first you are making a very big mistake. Do not order pushrods until the heads are on and you measure, if you do you are making mistake #2. Pushrods are always the last part you order. I checked the wipe on my YT's and they required more shim than supplied by YT, but my wipe pattern came out perfect. However, this also alters the pushrod required. See here: Link
Also, LS1howto is not correct for setting up the YT's. First set the wipe, then measure for the pushrods or you will be back here asking about problems with your setup later.
Also, LS1howto is not correct for setting up the YT's. First set the wipe, then measure for the pushrods or you will be back here asking about problems with your setup later.
...... and do it the way vettenuts says.
03-16-2008, 07:56 PM
#12
Yes, I was going to check the wipe pattern first. But like I said, I am up in Canada and no one has anything in stock for these engines anywhere. So it means stalling the project for a while while waiting for the correct pushrods to come in.
03-16-2008, 08:14 PM
#13
If the heads are off the car, you can check the wipe on the work bench. Then install the heads, measure and order from somewhere like JEGS who delivers in a couple of days. Only other options, which I know someone did, was buy a few lengths close to what you think you need and then returns the ones you don't use. But for this you need a very understanding shop and most won't be willing to do this.
03-16-2008, 11:33 PM
#14
Exactly......In most cities in canada it is very hard to find aftermarket parts for lsx based vehicles. So, special ordering is the only way to go usually. And that can be expensive if you order multiple sets and then try and return most of them. LOL
03-17-2008, 05:04 PM
#18
Where did you get the rest of the parts? You might see if they will help out. If you do your wipe on the workbench before you start, you can probably calculate the length and get close and then get the pushrods on either side of you calculation. Just remember, the shim thickness doesn't translate directly to pushrod length.