chrs1313

iTrader: (24)

The cam is ground correctly it is custom comp grind that Predator speced out for me

230 (3016) / 230 (3725) XFI/X-ER

.613 / .591 lift

Valve timing Open Close
@ .050 INT: 8 BTDC 42 ABDC
EXH: 50 BBDC 0 ATDC

it is a 107 intake center line with +4 ground into it so 111 LSA

I put the degree wheel on and found TDC and degreed the cam the ICL is 107 like it is supposed to be and all valve timing in within 1 degree of what it is supposed to be...max lift is also right on the money too...so now it was time to check PTV clearance...used a 2 checker springs and got around .050 on the intake, exhaust was over .100...also decided to clay the pistons to make sure i wasnt going crazy...

first i used a solid lifter and the results were INT .075 and EXH .140...i can deal with that

but then i tried it with a hydraulic lifter and got INT .045 and EXH .095...

Predator you said in a pm to me that the PTV clearance would be "good"...

Also i was wondering why such a huge change in PTV from going with a solid lifter to a hydraulic lifter...

I am in a jam right now thanks for all responses...

Patrick G i saw you speced out a similar cam on here too and was wondering your thoughts...

405HP_Z06

iTrader: (11)

Is the hydraulic lifter your using a 'solid' modified lifter or is it a normal lifter? The correct method of checking PTV clearance always involves a solid lifter. Double check the numbers you got with the solid lifter and those are the numbers you use.

ls2 bait

iTrader: (11)

think maybe this would be better suited to pm's........

edcmat-l1

iTrader: (10)

If you use a hydraulic lifter, YOU HAVE TO USE AN ADJUSTABLE PUSHROD, AND SET THE LIFTER TO ZERO PRELOAD. This is most likely your problem.

edcmat-l1

iTrader: (10)

Yes, def.

Redlinez

iTrader: (5)

That's almost exactly what PatG spec'd out as a recommendation for me.

NHRAFORMULA00

iTrader: (2)

We used a solid lifter with a adjustable pushrod set up with zero preload and got the
.075 and .140 numbers.Then we checked with a hydraulic (stock) lifter and got the .045 and .095 numbers.We did not know about setting the hydraulic lifter to zero preload,I think that is where we got freaked out by the low numbers!!!! So in thery when the motor is running the hydraulics actually collasp quite a bit from there pumped up demension. Patric G. or Predator care to emulate on this . THANKS IN ADVANCE!!

NHRAFORMULA00

iTrader: (2)

thanks for the responses i am just glad i pulled the heads though and clayed the pistons...i mean if i just threw it in and degreed it dot to dot i would not have know it was so close .075 is close...

it is not an attack at predator by anymeans...i have just been working on the car for the last two days and thought there was going to be plenty of clearance...and was told it was going to be plently...again i am not mad at predator so please dont read into it more than that...

this is chrs1313 signed on my dads name...thanks

chrs1313

iTrader: (24)

reclayed the piston with the solid lifter and got around .072-.073 clearance on the intake...

ls2 bait

iTrader: (11)

you are checking these with the gaskets in place right? pulling that head off an awful lot.

chrs1313

iTrader: (24)

yup gaskets in place...good thing for ARP bolts

DaddySS

You say that, but a red mad face and statements like;

"Predator...GOT PTV clearance problems with your 230/230 cam you speced out for me"

and

"Predator you said in a pm to me that the PTV clearance would be "good"..."

...sure sound like attacks to me. Don't mean to start anything here, just to remind everyone that we are trying to help each other out in the end, and if something doesn't go as planned we need to be patient, tolerant, and considerate.

dug

iTrader: (10)

u should check no matter what

Order 66

This is why you get your advise and purchase the cam from Engine Builders. Listening to guys on the net is not the best way to do things.

LS1Silverado05

iTrader: (41)

You are right, you shouldnt only go by guys on the net. But guys like Predator are just trying to help. Its ALWAYS up to the end user to make his own measurments and safety checks.

chrs1313

iTrader: (24)

I thought it was an upset face not angry and u are right it kind of does come off that way, not meant to though i am tell you that now...i mean put yourself in my shoes how would you feel if you possibly now have to pull the engine to flycut it or just leave it the way it is an cross your fingers that you dont smack a valve...it is all on me

i am just letting other people know out there that this cam profile is close and should not be taken for granted that it will fit with no problem...

MPHmotorsports

iTrader: (18)

I don't know if that is all that true. There are a few guys on this site that know cam's pretty well.
And I can promise you there are a **** Ton of shop's that are sponsor's and sell cams that don't know enough about cam's.
I am a shop that sells cam's daily and suggest's cams daily. I have seen 100's of cam's installed to see what fit's and dosen't fit. I am not sure what heads you have but if you have stockers I would have told you the cam should fit as well.

I also agree this has no business in here. Take it to PM and delete this thread. It has no positive value here.

edcmat-l1

iTrader: (10)

ANY cam with over 230 degrees duration and over .600 lift shouldnt be taken for granted. Even cams APPROACHING .600 lift with 230 deg duration should be checked.

chrs1313

iTrader: (24)

It can be deleted that is fine again i am not attacking anyone or meant to but now you know too that this cam is close that is all i was trying to do is inform someone possibly like me ready to get a cam close to this...

so it does have that value...

the car was SI before the cam...it has stock valves in 241 heads untouched...

quick346

iTrader: (4)

.080 int .100 exh is safe or say the goal. at .075/.140 i would say you are good to go.

Remenber the piston chase's the exh and the int valve chase's the piston. you are more than good on the ex and the intake is about within .005 of the safe range. a peice of paper is about .003 so that is nothing.

I say run it . and delete this thread that is not even close to being too tight.