Hey man glad to see you are back at it. I have my old 6.0l finally straightened out. It has become an animal, I still have a long way to go. I had true duals with a x pipe put on it will set you back now. Keep them coming ready to see some pulls on that. I have to get me go pro together and do some pull with mine to share with you.

@HeadFlowInc

5 жыл бұрын

stealthhit I have to get some data to make sure it doesn’t detonate at WOT. Getting the pushrod length dialed in now so I can try some WOT pulls. I can’t wait to see how your 6.0 pulls! 👍

I just did the comp cams pushrod length check on mine. Ls7 lifters with a Howard’s rattler cam. The 7.400 was a bit long and held the intake and exhaust valves open. Motor tan but was rich as hell. I swapped to the 7.350 and the valves are now closing all the way

@HeadFlowInc

Күн бұрын

That’s really interesting, most of the Internet would say that true LS seven lifters require longer push rods, not short. There could’ve been stem variance when they did the valve job away from stock.?

@russellschroeder990

Күн бұрын

@@HeadFlowIncI didn’t have any head work done when I built the motor. I basically followed Richard holders guidelines and took it to zero lash. 1.1/8 turn and I was at 22ftlbs. Motor runs awesome I think I need to get it re tuned

What do you have planned for the 7.400 rods? Just asking, I’m in need.

@chipster427

4 жыл бұрын

Just realized when this was posted.🤦‍♂️

What kind of oil are you running? I've had problems with oils other than mobile one being strong enough to withstand increased spring pressure

@HeadFlowInc

5 жыл бұрын

Jason Bolka I used a conventional Valvoline 5w-30 for the first 500 break in miles. It now has Mobile 1 Full synthetic 5w-30 oil. It’s been to cold/snowing to work on the Blazer, I will measure my required Pushrod length. I should need 7.375”ish. There’s just too many variables when mixing and matching part manufacturers and having the heads cut .030” during the rebuild. JD

@jasonbolka9713

5 жыл бұрын

@@HeadFlowInc yeah I would stick with the mobile one any ls and sbc builds I've done some of the comp edelbrock and stock hydraulic lifters if I didn't run royal purple or a good synthetic oil mobil one is the best imop Royal purple is just to damn expensive the added spring pressure from tbe spring upgrades would partially collapse the lifter once it was nice and hot and the first time I ran into the problem was on a sbc 355 mild street motor I built for a guy had my stupid for weeks trying to figure out wth was the problem I must have did the geometry for the pushrods 40 times and only figured it out because I pulled the intake and had to change the oil and made the guy go back with mobil 5w 30 and never had the problem again and it's still running today had the same problem on a 6.0 boost engine I built

Any help? I had my heads machined and they removed 8-10,000s. I still have factory push rods and need to know if i should get shorter rods?

@HeadFlowInc

Жыл бұрын

You will be fine with the factory length. .08”-.010” isn’t going to hurt anything, adding a little bit to the lifter preload is a good thing. If you’ve changed lifters and/or cam I recommend measuring for the proper length. JD

Why did you install a shut off valve in the heater hose?

@HeadFlowInc

5 жыл бұрын

Keith Carrurhers We realized last Summer, even with everything turned off on the heater controls hot air was coming out on the floor from the heater core. Melting 👎👎👎. I added the ball valve so I can stop hot coolant from flowing through the heater core, it actual made a big difference! 👍

Mine is the oposite .. Noisy at idle and when cold ... Gets quieter after warmed up / more rpms

@HeadFlowInc

Жыл бұрын

I ended up using the 7.400” after buying the adjustable pushrod to check and set the length. The 7.400” added enough lifter preload to help quiet the valve train.

Really nuts how these motors don't have simple adjustable rockers/ valve train like the older small blocks. 2 steps forward and three back.

@HeadFlowInc

2 жыл бұрын

It’s definitely more like a SBF setup for sure. JD

@RAWRMotorsports

Жыл бұрын

Agreed .... I want adjustments!!!! Wtf GM ! 😠😠

Longer pushrods will make the motor not as loud..stock push rods are 7.38" long..the aftermarket cams have a smaller base in most cases do to higher lift lobes an some other stuff, so this is why u get 7.40 push rods in most everyones cam kits an they shoot for .08-.1 on preload if using ls7 lifter...ls7 lifters have .126 of plunger travel in the lifter.(3.2mm according to gm) us hard core n/a guys run less pre load which makes for noise but there is a reason why we do so.the motors tend to rev faster and we run tighter ptv clearances..I put my pre load around .050 when hot on my engines with ls7 lifters..on a basic cam only (ms3,tick polluter,t-rex) big cammed ls with stock heads and gaskets I stick 7.375 push rods in and send it because I know this will put me in the range I shot for with my apps..i run 11/32 size rods in my cath port stuff and 3/8th in my lq9/ls3 combo..most my shit peaks to 6800-7k and pull to 7400ish....remember 1 full turn is .047 of preload on the bolt,you then have to take into account the rocker so if u run 1.7 rockers you do .047 x 1.7 to end up with .0799 preload for 1 full turn after zero lash..3/4 turn with a 1.7 is close to .060 preload..also different lobes will make for louder valve train..a fast lobe like the old comp xer's will make more noise then say a comp huc lobe with the same preload just because the different ramp rates..

@HeadFlowInc

5 жыл бұрын

ghost727 I’m not 100% sure, I believe the smaller base circle comes into play with cams .600” and higher? Have you used any of the Elgin, TFS, or TSP cams with under .600 lift with a small base circle? I’d be happy with +- .075” preload, I think I must have been more than this to begin with. Iirc with the 7.400” PR’s I was at 1 1/4 turns past zero lash torqued 22#. .047 x 1.250 x 1.7= .99875” Maybe too much for the Speed Pro HT-2148?

@HeadFlowInc

5 жыл бұрын

ghost727 Check this let me know what you think? kzread.info/dash/bejne/dIdoxtWeYcaynKw.html

@suicidal_racing

5 жыл бұрын

@@HeadFlowInc a larger cam .600 lift will have a smaller base circe..higher/larger the lobes or simple terms dur and lift the smaller the cam base becomes therefore making you need a longer push rod..the elgine style cams ive never used an not many apps id personally use them in for my own stuff,but my apps are more race apps or wild street stuff and I know I could just design a cam for my exact needs and have it cut..I don't really run any shelf cams unless the valve events arw close to what I want and can get a deal..new vs new though ill just design the cam and have it cut on the lobes I want an so fourth.

@suicidal_racing

5 жыл бұрын

@@HeadFlowInc the elgin cam shouldn't have much of a smaller base circle vs stock but it will be some being its like .570 lift and has more duration..it will be some but not crazy like a 25x/25x .650 lift cam that's .05-.06 in most cases..being you shaved them heads .03 right if you used stock ls1 lifters and .054 gasket like gm in theory you should of went from a 7.38 push rod down to a 7.35 because you took .03 off the heads to end up back at factory preload..its simple math then being only thing changed would be the head milling..once u change gaskets,swap to ls7 lifters and change cams then you get the fun of not being able to just do the basic math..but say like the cam in my camaro the 243/251 the base is .05 smaller ruffly so to get back to stock preload Id need a 7.43 push rod now being I swapped from a ls1 lifter to ls7 when I did the change the ls7 cup being .05 higher eliminated the extra .05 I needed on the push rod from the base being .05 lower then a stock cam..so now back at 7.38 which brings me into the preload range of the .060 on my shit..I run 7.375 push rods so I'm then ruffly .055 preload when cold..most the cam kits that give you 7.40 pushrods with the big cams end up putting most people around .08 preload give or take..like I said in my other post on your other vid the avg joe hears the sewing machine sound and go omg somewthing is wrong so that's why most company's make the kits have a tad more preload so its less noise...me I'm the type who runs tight ptv so I run as lil pre load as I can to help get my engines to rev but also if one pumps up it don't add that preload to my total lift and sending my valves to my pistons on a failure.

@HeadFlowInc

5 жыл бұрын

ghost727 Very interesting info, this makes me wonder why BTR and others recommend.100” preload, stating it helps avoid valve float by reducing the amount of oil beneath/below the plunger. I think Comp Cams recommends .050-.060” preload closer to what you run. This is all good info on how different builders choose to set up the preload. My MAHLE MLS gaskets are supposed to be the same thickness as OEM. Iirc either .051 or .054 🤔 The Speed Pro lifters are the big unknown factor really. Advance lists the HT-2148 for every app from trucks to Corvettes. 🤷‍♂️

Did you torque the rockers in sequence?

@HeadFlowInc

4 жыл бұрын

I’ve done it both ways and haven’t found a difference running single springs. I do think it’s a good idea to torque the rocker bolts in order/sequence so the lifter is on the back of the lobe. So far I’ve never found any rockers loose. JD PS I did break down and buy the LS pushrod length tool

@ScrapyardFights

4 жыл бұрын

@@HeadFlowInc what pudhrods did you ultimately end up with? I'm running 7.4s with prc heads and an ms3 cam. I've got valve train noise.

@HeadFlowInc

4 жыл бұрын

I put all the 7.400” back in after checking it with the PR tool. Please spend the $25.00 and get the adjustable PR length checker it’s the best way. kzread.info/dash/bejne/dIuLt8mziavFfrA.html

@HeadFlowInc

4 жыл бұрын

Find out how much lifter preload is recommended by the lifter manufacture. The preload can vary from .050” to .100” so it does make a difference.

@ScrapyardFights

4 жыл бұрын

@@HeadFlowInc I've got ls7 lifters.

Mine has some noise and has no play in any rockers. I have ls7 lifters. Block was decked. Heads were milled and also had a valve job. Bigger cam too. I think pushrods are my issue.

@HeadFlowInc

2 жыл бұрын

100% check your pushrod length with a length tool. The tools is about $25.00 and takes the guesswork out of it. True LS7 lifters have a different pushrod cup depth. kzread.info/dash/bejne/dIuLt8mziavFfrA.html

@alexfann5322

2 жыл бұрын

@@HeadFlowInc Delphi ls7 lifters are what I have. I have a video of the sound if you’d like to hear.

@briandafcik

Жыл бұрын

@@alexfann5322 can you send me a video of what that sounds like, I think I have the same issue?

@alexfann5322

Жыл бұрын

@@briandafcik lol come to find out my flex plate bolts are loose. Got under the truck while it was on a lift running and it was coming from the converter area.

@briandafcik

Жыл бұрын

@@alexfann5322 honestly that’s the first thing I checked was the torque converter bolts and was all tight, I hear it from where the flex plate is located but everything seems to be fine! I just rebuilt the motor put ls7 lifters in with a stage 2 btr cam kit and now I have that noise 🤷🏽‍♂️

Jesus, For fuck sake's people, just measure the damn push rods with the checker! Don't do what he's done!

@HeadFlowInc

3 жыл бұрын

I agree, I bought the adjustable pushrod so I can easily find the length needed to set the lifter preload. See one step at a time it all ends well, don’t panic. JD

@BUZDRIFT

3 жыл бұрын

@@HeadFlowInc Hahaha, after I commented I realized you made a video with the tool! So much easier!

@dlsjr1978

6 ай бұрын

@@HeadFlowInc but why would you just switch out the pushrods first instead of just getting the checker and doing it right the first time?

You have a aggressive cam? If so your drive train will be louder.

@HeadFlowInc

2 жыл бұрын

Mild Elgin 1838p .560/.560 @.050 216/220 adv 285/292 LSA 114

@John-qz4cv

2 жыл бұрын

@@HeadFlowInc i know with aftermarket cams its possible to have different size rods per lifter. There is a way to measure what's needed for each.

i recently have done a 6.0 L76 all aluminum build, had the stock afm/dod cam reground on the 1,4,6,7 lobes to match the others. i used the "LS7" lifters and it has 120 thousandths of plunger travel, block was decked, heads decked, the stock push rods gave me 65 thousandths pre load when rocker torqued to 22lbs, and mine is very loud when hot. not sure if engine heating up is taking away half of my preload?

@HeadFlowInc

2 жыл бұрын

Because the block & heads are aluminum you’ll lose preload when the engine warms up. You may have to shoot for a cold preload of .080” to Bet the .065” you wanted. I think the longer pushrods should help. Might try a 7.425” or a 7.450” PR

@803brando

2 жыл бұрын

@@HeadFlowInc yeah think ill try that.

1) Check it. Don’t make guesses. Check it. 2) you had a loose rocker arm. You will disagree, but when you loosen it and the lifter is on the lobe of the cam, that’s pushing on the rocker making it appear tight. 3) pushrods too long (by a measly.050) is not going to tick. It will make the engine run bad and hang the valves open and be hard to start. 4) I hope you rotated the motor over as you were torquing the rocker bolts because the lifter needs to be on the base of the cam lobe. If you just simply torqued the bolts, it will come loose

@HeadFlowInc

5 жыл бұрын

Kfx Guy All the rocker bolts were tight, almost too tight, I was worried about pulling the threads on a few. In my assembly video you can see I torqued the bolts in order using the firing order rotating the engine.

Good job! Let us know if it fixes the noise issue.

@HeadFlowInc

5 жыл бұрын

Preinstalled User Well I have mixed results: I had one oddball valve stem height on the driver side needing a .030” shim to set the valve spring installed height 1.800”. So the one oddball valve got louder switching to the shorter PR, so I’ll have to measure to see what it needs. If everything was stock unmachined I’d need 15x 7.355”-7.370” and 1x 7.385”-7.400” 1. Unsure if the cam has the same base circle as OEM 2. Unsure if the HT-2148 lifters have OEM cup height 3. People claim factory PR’s only measure 7.385”? 4. Heads were milled .030” I’d bet it would need 15x 7.375” and the oddball 7.400-7.425”, but has to be measured to be sure. 🤔🤔🤔

I know this video is old but my valve train is noisy as crap. I have a aluminum 6.0 with a btr stage 2 cam,ls7 lifters. I checked with length checker and came up with 7.425 rods with recommend .100 preload and 2 full turns from zero lash to torque because rods are .18 longer then advertised. I'm going to go to 7.375 and see if it quiets it down. I've heard people say longer quiets and also shorter will quiet it. I've also heard you have to find the sweet spot for each engine.

@HeadFlowInc

3 жыл бұрын

Getting the lifter preload where you want it actually has very little affect on idle noise unless the PR’s are way to short. If the PR’s were to long it would idle poorly or not at all from the valves not closing all the way. Areas you will find valve train noise is in the rockers, especially if they’ve been upgraded to the solid trunion setups like mine. Also carefully check the pushrod cup in the rockers, they can get egg shaped or out of round from wear and be noisy. I’ve always wondered about those manufacturers recommending .100” preload because you have to be dead on. Really .075” is a decent preload try a set of 7.400” and see what they sound like. JD

Did it help quite it down

@HeadFlowInc

3 ай бұрын

I ended up buying a push rod length checking video and needing the 7.400” length. It all depends on how much lifter preload you want to run when selecting PR length. I will say with shallow or shorter preload. The lifters are going to be noisier.. I’ve been shooting for .070” preload

Those 7.400 are for H124 lifters and, 7.350 are for hl128 lifters ( Aka ls7 lifters)

@HeadFlowInc

3 жыл бұрын

So the LS seven lifters are taller than the regular lifters? For some reason I thought the LS7’s used a longer pushrod non-or shorter? I wish I could see those lifter side-by-side so I would know in the future I had to tell them apart.

I put a video on my channel of the noise mine makes.

@HeadFlowInc

3 жыл бұрын

I’ll check it out

7.425

@HeadFlowInc

5 жыл бұрын

ChemicalSpore It’s very possible I could need longer not shorter PR’s. It’s a mystery needs solving

@YoungerPrice

5 жыл бұрын

You need a push rod length checker my cam twice the size as yours no noise at all but I'm running racing lifters not cheap ls7 ones

@HeadFlowInc

5 жыл бұрын

blown5.3 Comp Cams 7200-1 should be here any day! I agree stay tuned I’ll make a video checking the PR length I need. Do you have a lifter preload you prefer? I’m looking at .050-.075” thoughts?

@YoungerPrice

5 жыл бұрын

@@HeadFlowInc all lifters are different I believe ls7 need .80 I'm running .60 no issue s,I also seen a ls1 gain 20hp going from .50 to .100 preload that 20hp was around 5k,every setup is different good luck

@HeadFlowInc

5 жыл бұрын

blown5.3 Thanks I truly appreciate the feedback! JD

Neither, measure it

@HeadFlowInc

4 жыл бұрын

cbr1thou I finally broke down and bought the LS adjustable pushrod to actually measure the needed length. kzread.info/dash/bejne/dIuLt8mziavFfrA.html

@cbr1thou

4 жыл бұрын

@@HeadFlowInc yeah and a 8" digital caliper, measure overall length, end to end, tip to tip, whatever you want to call it, total length and add your desired preload to that length. Manton pushrods will make them off your overall length. Mine are 11/32 and .120 wall thickness, kick ass shit