35thls1ss19

iTrader: (1)

Ok i have never done this before... but after reading the last post about the dart cnc ported heads i got scared and called tsp.. they said it cant hurt. Well i got soem clat and put it on the piston. Not sure how think i sohuld make it? it was a little under 1/8in somewhere in there. So i turned the car over and on the intake valve made a mark in the clay. did i make the clay to thick or do i not have enought pv clearenc? i dotn no what to do now thanks for the help guys

walker94z28

In the mark, if there is still clay then you didnt hit. If in the mark you see shiney from the piston, then you got isues...

35thls1ss19

iTrader: (1)

well dam it was close.... i am goin to have to call tsp again tomm. And have to try the clay again. if it didnt cut right threw to the piston it was close as hell.

35thls1ss19

iTrader: (1)

ttt..... any other suggestions on what i should do?

PREDATOR-Z

The only accurate way to measure PTV is using a Dial indicator and measure 10* ABDC and 10* BTDC.
Those readings will tell the truth.

GuitsBoy

iTrader: (4)

And all the degrees inbetween. Might even expand that to 15* before and after since youre running a fairly large cam.

JoeyGC5

iTrader: (24)

What head gaskets?

1fastWS6

iTrader: (3)

You also need to be using an adjustable pushrod, rockers tighened down and 0 lash on the lifter......once you have a mark in the clay, you need to measure how much you have left between the bottom of the mark and the top of the piston using a dial caliper. You need .080" or so, just under 3/32".

bowtieman81

iTrader: (35)

I agree with predator, guits, and 1fast. There are a few threads about measure p/v clearance with dial indicator.

I did not use an adjustable pushrod, but next time I do it I think I will. Should make it easier on me.

35thls1ss19

iTrader: (1)

well with the clay i cut right threw and saw the piston. so i sohuld still do the dial indecator? or i ahve 3 other options 1. send the heads back and get the valves sunk .040 thats as much as he can do. what will this do less compression? 2, look into gettin some etp heads they will clear if i am not mistaken. 3. smaller cam. I would like to get the most out of my H/c i can and i no a big cam liek the ms3 would do that but now it has became a pain in the ***

35thls1ss19

iTrader: (1)

stick head gaskets... can i go thicker?

DROPTOPLS1

iTrader: (28)

I am having the same problem with my darts and torquer 2.Thinking about selling them and getting afr's because I don't want to notch my pistons.

35thls1ss19

iTrader: (1)

i was goin to go with the tourqer 2 if i went smaller cam. i cam is already in i just want to get heads on the cam a start it up though.... this sucks!

AintQik

iTrader: (3)

I have a question that has been bothering me with clearance checking. Does the fact that the lifter is not under oil pressure affect the valve movement? In other words, will a pumped down, no oil pressure lifter collapse and give an incorrectly smaller valve movement reading than what would be the case under normal running conditions.

DROPTOPLS1

iTrader: (28)

I know how you feel I waited almost two months to get these heads. I just want to get it running.My heads were also milled .015. I don't know how much clearance you have but I did not have any. Maybe the torquer will work for you.

GuitsBoy

iTrader: (4)

Yes, it matters very much. If youre using a 5# checker spring, and you torque the rocker down to 22 ft lbs, the lifter overpowers the checker spring and you get no lifter preload, which will considerable lower your p to v. If you used normal valvesprings, and you used a hydraulic lifter, the lifter cup and plunger will bottom out before it starts opening the valve. This will show more P to V than you will actually have when you run the motor.

The most correct way to test, is to use the checker spring, and install an adjustable pushrod and get the lifter preload down to 0 when you torque the rockers down. If you dont have an adjustable PR, you can always just hand tighten the rockers till theyre snug against the pushrod and the valve (youll likely see a .050 or more gap at the pedestal.

HTH

35thls1ss19

iTrader: (1)

what is this cheaker spring? i used the springs that came in the head. i also used a stock pushrod. what should i be doin exactly is that why i am gettin a bad readin in the clay and its cuttin threw?

GuitsBoy

iTrader: (4)

A checker spring is a little low weight spring that you can easily compress with your hand. Its used for mocking up the head and taking measurements like this. If you were using your regular valve springs, usually this overestimates your P to V rather than underestimating it.

35thls1ss19

iTrader: (1)

so if i am hittin with the prc spring then i am screwed either way? and i should just be puttin the clay on teh top of the pistion? i saw this thread and dont understand where thsi guy has the clay
https://ls1tech.com/forums/showthrea...highlight=clay

n2oJOE

iTrader: (1)

you have hydralic lifter they pump up when the engine is on and there is oil pressure, if the engine is off and there is no oil pressure the lifters are not gonna be pumped up and you will have a reading that is incorrect, but when they pump up your pv clearanc is gonna be less then it is now so make sure ur using the right length pushrods also buddy and wat rocker are you using???