Just got an MS3.
Before I ordered I talked to Jon at Texasspeed who told me "The MS3 is the biggest cam that we offer that you can use with your heads without having to flycut."
However, I called in to double check today before I put it in, and the other Jon informed me that this cam will not fit with the PRC 5.3L 220cc 2.5 heads without a valve job.
I think when you order the heads you have to specify if your going to be running the MS3 and they will go ahead and perform the valve job before sending the heads out, however I never specified because I ordered the Torquer II originally and recently decided to upgrade.
What Im wondering is has anyone run the MS3 with these heads without flycutting or doing the valve job?
How much clearance did you have?
I donot want to have to pull my heads off again, Ill prob just end up selling the MS3 if it comes down to that.
hmmmm... This makes me feel alot better. ******* yesssss i can put the ms3 in after all
Has anybody heard of what I am talking about tho? Getting TSP to install shorter valves for the valves to clear the piston?
they dont install shorter valves. they must machine the head down where the valve seals so it is sunk into the head more. Iv read about this in other threads. you actually may have to have that done. id call tsp and double check one more time.
I have those heads with a tr224/112. I wanted to go ms3,but was told I had to send the heads back to sink the valves. Had I ordered the heads with the ms3 it would have been done that way,but since i did not i had to remove and send back. I now have a custom by pat G and it measures 232/238 and it will fit so I'm going to install it
Alright guys, let me help you guys figure out what's going on here. You CAN purchase this setup (MS3/PRC 2.5 5.3L heads)and make it work without issue. However, if you want to run the MS3 cam, you MUST specify that you are running that cam when you order the heads. If you don't, then the valvejob isn't setup for the MS3 cam and there will NOT be sufficient PTV clearance. In this case, I don't think the proper valvejob has been done to allow the customer to run the MS3 cam without flycutting or sending the heads back to have the valvejob cut.
On a side note, every salesman here is very knowledgeable in these cars/engines and if there is one of us doesn't know the answer there is someone here who does 99% of the time. Matt, I think there was a misunderstanding between your and our salesman Matt yesterday. He was told there wasn't a torque arm for the M9 so that's what he told you. I just remembered you could run the TA and TA relocation with the True Dual Exhaust. Feel free to give us a call and talk to any of the sales guys. I'm 100% sure any of us can get you the help you need.
I talked to TSP today about this. Aparently I was right... The MS3 will work with 5.3 Stg2.5s with out a valve cut deeper. And no Fly cutting is involved. However, like in this situation, when you order the Torquer V2 with the PRCs, they did not cut the Head to the valve clearance they see fit. TSP DOES NOT RECOMMEND you run the MS3 with the PRC stg 2.5 5.3 heads UNLESS you have the "Valve Job". But they will still clear.