Darth_V8r

iTrader: (4)

The way I look at it, the bosses in the heads serve as guide plates

QTR FMS

we just checked bank 2 it took 5 and half hours to measure, on the first pushrod it took maybe 2 hours to realize that the tick performance is at least 0.00625 longer, we tried 1/16 turn at a time and we got 7.503125 for the exhaust pushrod and 7.50625 for the intake pushrod but when we checked 7.500 tick performance pushrod they had around 1/4 preload and when we went with 7.525 we got 1/2 turn preload.

also, we had inconsistencies when comparing the number of turns on the checker and the number of turns on preload, we saw a 3:00 difference on the same checker length.

6 rocker arms had 2:00 - 4:00 preload with 7.500 pushrods < we may get 7.490 tick performance pushrod to confirm that they all are at or less than 0.035 preload
2 rocker arm was at zero lash with 7.500 pushrods < I think we should order 7.535 instead of 7.525.

using 7.525 pushrods we got the following preload turns

2 exhaust 6:00 <14 turn and 1/16 using checker
intake 6:00 <14 turn and 1/8 using checker

4 exhaust 8:00 <14 turn and 1/16 using checker
intake 8:00

6 exhaust 6:00 <zero lash at 7.500
intake 8:00 < 14 turns using checker

8 exhaust 8:00
intake 6:00 <zero lash at 7.500

should we leave it at 6:00 and 8:00 or should we buy 7.490 to confirm zero lash and 7.535 for the 2 short ones?

1FastBrick

iTrader: (16)

I remember those days Prior to purchasing the MS Components tool.

If you are ordering singles, you could check that you have zero or less than zero preload and order as needed.

You want to get that zero lash number and add your desire preload.

You don't want tension from the Valve springs or pressure from the lifter loading the checker tool. It can effect the true measurment.

They tell you to shoot for .035 with a plus/minus of .010 . Some builders shoot for the high side of that. I dont the expansion rate of the various blocks but I have herd the aluminum motors grow substantionaly more than the Iron blocks.

Darth_V8r

iTrader: (4)

Instead of buying pushrods, set your checker before installing it to 7.490 and verify you get basically zero lash and zero preload.

I very often will double check my measurements by adding my desired preload to the checker tool and verifying I get 1/2 turn. It is a great secondary check to prove your method is correct.

If they're all coming in at 6:00-8:00 range, I would run them.

Darth_V8r

iTrader: (4)

This is a FWIW post.

Aluminum expands way faster than steel. Since the pushrods are steel and the block is aluminum, you will lose about .010 preload. Or gain .010 lash. Depending on your perspective.

If running an iron block, your cold preload and hot preload will generally be nearly identical.

1FastBrick

iTrader: (16)

Thanks! I knew the aluminum expanded faster But I didn't know the rate.

IIRC I think Mr. Tony Mamo told me basically the same thing when I was setting up an engine with one of his top end packages.

Double06

I think someone did a test I think one turn on a 1.8 rocker was like .080 or preload and 1.7 was like .72 preload. So a 1/4 turn is like .020 preload?

Darth_V8r

iTrader: (4)

That's probably not far off. I remember calculating out 1.7 ratio rockers to .076 preload, but if we're talking .076 vs .072, that's splitting hairs. I just calculated out 1.8's and got .078, so again, splitting hairs. I would trust someone's reliable real-world numbers over my calculations.

QTR FMS

we checked cylinder #6 intake pushrod again and it was around 10:00 so we installed 7.500 and its now at 4:00.

we checked bank 1 and we had 1 at 11:00 and another at 9:00.

I think we need at least 3 pushrods 7.515 long.

if it's true that every 1/4 turn is 0.018 preload then we may need 9 pushrods shorter around 7.515 and I think cylinder #6 intake pushrod confirms that 0.025 shorter pushrods removed 6:00 or half a turn.

we will try to target between 4:00 and 6:00 preload.

the compression test drastically improved now its between 180-190, it was 75-110 when we first installed 7.550 pushrods not sure if that is the reason or if it was the new headgasket not sealing properly and required heat cycle

CattleAc

iTrader: (7)

Ordered mine today...I'll be remembering those the first time I use it.

Darth_V8r

iTrader: (4)

My gut feeling on this is that the longer pushrods were keeping your valves open longer, causing pressure bleed down. I think when you get your 7.515 pushrods in and your preloads are in line, you'll be much happier with the engine performance.

Double06

If you had a 7.55 pushrod and you are looking at 7.15 or less for proper preload and have .25 or so of preload with that lifter travel you had valves open. You will pick up .010 when it gets hot which will help.

QTR FMS

we asked tick performance to make us custom pushrods but they said they cant and they wont tell us who made them.

so we got XD-A pushrods and compared them to tick performance and to get the same length visually comp cam needed 0.032 more, which is the difference between gauge length and theoretical length I assume, but when we installed them on the same rocker arm comp cam still needed to be 0.02 longer to be at the same lash.

now we are confused where did this 0.02 come from, is it from the pushrod end ?? the difference is large between the two pushrods its around 0.052

with tick performance, we need 7.5258 and with comp cam XD-A we need 7.580, this caused another problem the pushrod we order is 7.320-7.560.