Moparts

Indy EZ-1 piston to valve clearance?

Posted By: Mopar_Ray

Indy EZ-1 piston to valve clearance? - 03/19/11 02:48 PM

Getting ready to replace heads. Going to from 906 heads to EZ-1 heads. I know I should check, but may not even be an issue? Motor is a 440/505 stroker. SRP flat top pistons. Piston deck height is .025 below. Comp XE295HL Hydraulic, 251/257 duration, 564/564 lift cam. Trying not to "over think" this, anyone have a similar build? Is this even going to be an issue?
Posted By: ChrgrCuda

Re: Indy EZ-1 piston to valve clearance? - 03/19/11 03:04 PM

I have a similar build, except a solid roller. My P2V clearance was .120 intake, I'll have to look at my notes for the exhaust. It was plenty. I used playdough on the pison, oil on the valves, installed head gasket, torqued to 30 ft.-lbs. Then removed, cut the playdough in half, and measured. I probably did it in a very archaic way, but that's how I have done my small block strokers as well and it worked for me.
Posted By: Mopar_Ray

Re: Indy EZ-1 piston to valve clearance? - 03/19/11 03:51 PM

Quote:

I have a similar build, except a solid roller. My P2V clearance was .120 intake, I'll have to look at my notes for the exhaust. It was plenty. I used playdough on the pison, oil on the valves, installed head gasket, torqued to 30 ft.-lbs. Then removed, cut the playdough in half, and measured. I probably did it in a very archaic way, but that's how I have done my small block strokers as well and it worked for me.



Thanks, with hydraulic lifters they say to temporarily replace lifters with solids to check? Thats why I'm trying to figure if it will even be an issue. Kind of a pain to remove lifters just to check.
Posted By: Cab_Burge

Re: Indy EZ-1 piston to valve clearance? - 03/19/11 05:33 PM

Quote:

Quote:

I have a similar build, except a solid roller. My P2V clearance was .120 intake, I'll have to look at my notes for the exhaust. It was plenty. I used playdough on the pison, oil on the valves, installed head gasket, torqued to 30 ft.-lbs. Then removed, cut the playdough in half, and measured. I probably did it in a very archaic way, but that's how I have done my small block strokers as well and it worked for me.



Thanks, with hydraulic lifters they say to temporarily replace lifters with solids to check? Thats why I'm trying to figure if it will even be an issue. Kind of a pain to remove lifters just to check.

It is always better to be safe than sorry Get the tools out and switch those two lifters and check the actual P to V clearances BTW, I'm running .060 P to V on my 440-1 headed 527 motor with a soilid roller cam, good valve springs(325lbs. on the seats and 830 lbs opened) and Harland Sharp rockers I like to see .080 but I'll live with .060 until it fails
Posted By: Stanton

Re: Indy EZ-1 piston to valve clearance? - 03/19/11 06:50 PM

Quote:

Thanks, with hydraulic lifters they say to temporarily replace lifters with solids to check? Thats why I'm trying to figure if it will even be an issue. Kind of a pain to remove lifters just to check.



And the pushrods will be significantly different for solids as opposed to hydraulics too.
Posted By: JohnRR

Re: Indy EZ-1 piston to valve clearance? - 03/19/11 07:13 PM

Quote:

Getting ready to replace heads. Going to from 906 heads to EZ-1 heads. I know I should check, but may not even be an issue? Motor is a 440/505 stroker. SRP flat top pistons. Piston deck height is .025 below. Comp XE295HL Hydraulic, 251/257 duration, 564/564 lift cam. Trying not to "over think" this, anyone have a similar build? Is this even going to be an issue?



for a person to accurately answer this question the ywould have to have the exact same engine as yourself , exact , deck height , piston in the hole , same heads and cam.

What is such a pain to pull a lifter? You have to pull the heads which requires the intake to be off , the lifters are right there , do you piston to valve check with intake off.

Don't forget you need to swap 2 springs to lightweight checking springs , there is your pain ...
Posted By: Mopar_Ray

Re: Indy EZ-1 piston to valve clearance? - 03/19/11 08:12 PM

Quote:

Quote:

Getting ready to replace heads. Going to from 906 heads to EZ-1 heads. I know I should check, but may not even be an issue? Motor is a 440/505 stroker. SRP flat top pistons. Piston deck height is .025 below. Comp XE295HL Hydraulic, 251/257 duration, 564/564 lift cam. Trying not to "over think" this, anyone have a similar build? Is this even going to be an issue?



for a person to accurately answer this question the ywould have to have the exact same engine as yourself , exact , deck height , piston in the hole , same heads and cam.

What is such a pain to pull a lifter? You have to pull the heads which requires the intake to be off , the lifters are right there , do you piston to valve check with intake off.

Don't forget you need to swap 2 springs to lightweight checking springs , there is your pain ...



Pardon by lack of knowledge, not worried about the "exact" clearance. But before pulling lifters, replacing with solids and swapping springs I thought someone might be running a flat top piston with a hydraulic cam. just want to know if its enough to get by until I move to a higher lift roller cam?
Posted By: Stanton

Re: Indy EZ-1 piston to valve clearance? - 03/19/11 09:11 PM

Quote:

What is such a pain to pull a lifter?



I think the "pain" is having to buy 2 solid lifters and 2 checker pushrods !!

On the bright side, you're going to need the checker pushrods anyway since your head swap is going to dictate new pushrods.

And by the way, don't even think of running those EZ's "out of the box" if you got them from ICH. At LEAST blow all the passages clean and heve the valvejob checked.
Posted By: Mopar_Ray

Re: Indy EZ-1 piston to valve clearance? - 03/19/11 09:44 PM

Quote:

Quote:

What is such a pain to pull a lifter?



I think the "pain" is having to buy 2 solid lifters and 2 checker pushrods !!

On the bright side, you're going to need the checker pushrods anyway since your head swap is going to dictate new pushrods.

And by the way, don't even think of running those EZ's "out of the box" if you got them from ICH. At LEAST blow all the passages clean and heve the valvejob checked.



OK,OK I'l buy the the lifters. Know I need the checker pushrods. More worried about switching to checking springs. Heads while not being ported, are being checked by a hghly respected builder.
Posted By: Stanton

Re: Indy EZ-1 piston to valve clearance? - 03/20/11 02:38 AM

Have him switch in a couple checker springs for you. Once you're done have him reinstall the valvesprings. This should be a freebee!
Posted By: Dunnuck Racing

Re: Indy EZ-1 piston to valve clearance? - 03/20/11 03:01 AM

I know a lot of guys like to use checking springs to do this,but I prefer to use the exact setup I will be running.Valvetrain deflection is pretty much non existant with checking springs.
Keith
Posted By: 383man

Re: Indy EZ-1 piston to valve clearance? - 03/20/11 06:30 AM

I am using Indy EZ heads on my new eng but I have not checked the PTVC yet. I am running the dished quench piston thats .008 down in the hole so I hope they give me enough room. I will have 10.6 comp as my heads were cut a tad to get the chambers from 75 to 70 cc. Ron



Posted By: dodgeboy11

Re: Indy EZ-1 piston to valve clearance? - 03/20/11 06:35 AM

While knowing exactly what your P2V is is nice, taking into account valvetrain deflection is not necessary as the deflection will actually increase your clearance. Clay is a good method to use as it shows the radial clearance around the valve as well as the depth. With those pistons and that cam, I highly doubt you'll have issues, but it's best to be sure. You should know that there are many many variable to this measurement and changing cam timing will change your clearances. When you decide to go to a solid, aside from changing springs you will want to recheck your piston to valve clearances. It's not lift that kills valves, it's duration.
Posted By: JohnRR

Re: Indy EZ-1 piston to valve clearance? - 03/20/11 06:48 AM

Quote:

Quote:

Quote:

What is such a pain to pull a lifter?



I think the "pain" is having to buy 2 solid lifters and 2 checker pushrods !!

On the bright side, you're going to need the checker pushrods anyway since your head swap is going to dictate new pushrods.

And by the way, don't even think of running those EZ's "out of the box" if you got them from ICH. At LEAST blow all the passages clean and heve the valvejob checked.



OK,OK I'l buy the the lifters. Know I need the checker pushrods. More worried about switching to checking springs. Heads while not being ported, are being checked by a highly respected builder.


you don't need to buy 2 lifters , you can take 2 of your hyd lifters apart , pull the guts and fill the space with small machine washers and putthe cup and retaining ring back in and use the pushrods you have ... But with EZ's you need longer pushrods, if you have a hollow pushrod you can make a checking pushrod by cutting it , tapping the insides and using a piece of fine thread threaded rod .
Posted By: moparniac

Re: Indy EZ-1 piston to valve clearance? - 03/20/11 11:24 AM

Quote:


OK,OK I'l buy the the lifters. Know I need the checker pushrods. More worried about switching to checking springs.



well if ya dont swith out to the lightweight springs and use a "checker pushrod" that pushrod may fold/bend up...

What you can do is put the new head on your engine with the springs your running already on the head and put some washers in between the block and head that is the thickness of the headgasket your gonna run and snug the head down (you have solid lifter in there with normal pushrod) back the lash out of the rocker and stack some feeler gauges up for example .080's worth inbetween the intake spring and rocker snug with no lash and roll the engine over slowly before tdc starting about about 20* before and 20* after to see if the valve kisses the piston (as said go slowly) do the same for the exhaust and also take into consideration you havent put lash in yet ....a good friend of mine who used to work for yates taught me this and it works pretty well for situations like yours IMO....

also for the record I switched from 906's to indy EZ's MW with a solid roller about .660 lift and had plenty of clearance but every situation can be a little different like noted above and really should be checked!
Posted By: B G Racing

Re: Indy EZ-1 piston to valve clearance? - 03/20/11 11:29 AM

If your .025 in the hole,pistons are flycut(valve reliefs) or dished and you use a .030 to .050 head gasket with the 78cc EZ head you will not have any problems with a cam under .600 lift.
Posted By: Mopar_Ray

Re: Indy EZ-1 piston to valve clearance? - 03/20/11 12:56 PM

Quote:

If your .025 in the hole,pistons are flycut(valve reliefs) or dished and you use a .030 to .050 head gasket with the 78cc EZ head you will not have any problems with a cam under .600 lift.



Bob, Exactly who I hoped might reply to this question!
Posted By: B G Racing

Re: Indy EZ-1 piston to valve clearance? - 03/20/11 05:09 PM

Posted By: carolinacuda

Re: Indy EZ-1 piston to valve clearance? - 03/21/11 09:18 PM

Well i got EZ's with a 440 with old trw 2355's pistons. I had the same cam in mine with no clearance issues. I ran the cam straight up with no advance.
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