KevinR

Good choice man. Good luck with it. I put a Trex cam in mine first and I thought I was clear. Got really close at .53. Fortunatly just at idle the first day I had a lifter tapping. Pulled the heads, and saw little marks on every piston where the exhaust valve was hitting. I took a step down to the RapTR and I am very pleased with the performance. Have fun.

Intercooler2

iTrader: (24)

Yea he said they have seen the valves make their own notches with that cam but it doesn't hurt anything.


What clearance did you get with the RapTR? Any numbers with it?

outkast6991

iTrader: (34)

i really hope your gonna measure and degree the cam. there are alot of "what if's" and "should be's" in this thread.

Intercooler2

iTrader: (24)

We may check valve drop but the motor is together so other than simple checks I doubt it.

KevinR

Sorry man, I was off a bit. .103 on the exhaust, and .124 on the intake. Preload was right at .100

KH504

iTrader: (3)

I have 2.055 intake valves and that cam would not fit in my combo. The most we could fit was a 230 / 242 615 / 615 lift on a 116 and 60 thou head gaskets . Geoff at EPS worked the numbers for me.

Intercooler2

iTrader: (24)

Did you do any measurements with clay or valve drop?

Here is a procedure:

http://www.diyporting.com/PVC.html


We will check it as best possible. Looks like the exhaust is more of the issue.


What's min numbers? Seems it varies according to who you talk with.

KH504

iTrader: (3)

I brought Geoff my heads and he pulled two springs off and measured the distance it took for the valve to stop laying it on a flat surface. He took that info and compared it to a stock head. I see you cant do that so double check that cam in your motor because its going to be tight.

Intercooler2

iTrader: (24)

Not on my particular head but Patriot did do a drop test yesterday on another set of heads just like mine and I had the stock .158" spec Thunder supplied for stockers. I can do my stockers again just to verify.

What did you have for drop numbers?

Nitroused383

iTrader: (10)

Do things right and measure your PTV clearance with a checker spring. You don't need to pull the heads at all, just a valve spring. Which you will have to reshim your springs for a new cam anyways. I really do no think that cam is going to clear but hey good luck. With my 224 cam, .051" gaskets and .020" worth of milling on stock 243 heads I only had .068" intake valve clearance at 10 degrees BTDC. Stop throwing parts together and do things right. Scrap those heads, they don't work on your setup... A low compression 2.05" valve setup is not what you need.

chrs1313

iTrader: (24)

couldn't agree more...I highly doubt you will have that much clearance...stock 241 heads here with stock mls gasket and a 230/230 cam on 111+2... had .086 on intake... exhaust was like .120

I would definitely measure with a checker spring...

also that is with a 2.00 valve too...

going from 2.00 to 2.04 is around .005 less clearance

Intercooler2

iTrader: (24)

We will see. If it doesn't measure out Thunder said I can exchange it.