never mind i found it... is flycuttin recommend on the g5x4 or ms4?

 

I don't know about either of those. I would recommend checking PTV though with any big cam that has a tight lsa. It's not too hard to do, even if you are not pulling the heads you can check using a checking spring,( going to have the springs out anyway), and a dial indicator.

There was a post on here, by Jason at TSP, that talked about some actual PTV specs they got with the MS4, might want to read that keeping in mind that all engines are different.

 

I was talking to my buddy and his actually from Fort Worth and his going with a T-Rex and he had told me that he called TR and that it's rare that these rarely fit with stock heads. Definately check your PTVC.

 

I think there are a lot of people who have run the T-Rex on stock heads with no issues.

 

the trex was designed for stock heads "best cam only car to date"

come on now

 

To be on the safe side go with a smaller cam if your worried about P/V clearance issues. You will leave a few ponies behind but thats a great peace of mind knowing that you will not ever have that issues with your valves touching. I like the cam from what I have been hearing but I will get a custom grind from TR close to the TREX with a lil less lift and duration just a lil hahahah.

 

All these huge cam have a price to pay.

PTVC should be measured and cam degreed.
I do not subscribe to the "many have done it without an issue" and what if you are one of the few? Collateral damage

Patrick says it straight, those combos are legit if optimized. I've beaten T-Rex at the track with a H/C 224, why? Because his setup wasn't optimised.

Morale is don't just think that by shoving the biggest cam you're gonna move faster.
Power numbers are for dyno queens, track numbers are for road killers.
Combo-Combo-Combo, cha-cha-cha

 

Me personally, i went with the MS4 and no they are not supposed to require flycutting. I jsut knew that i wanted something that will pull up top bc with the juice and stall to get you out the hole, you dont want to fall on your face at the 1000' mark, and the big cam should do the job. Now with a big cam your ofcourse going to have to have a big stall, as predator said its all about your setup and how the parts work together.

 

Strange because I had a Trex in my car and there wasn't any issues. I have another local friend who has a Trex as well; same thing. Both cars 100% stock heads, no porting milling nothing, 100% stock/gaskets and all.

 

Why do people still insist on the doing the whole "my buddy said he talked to some guy who knew a guy that said it wouldn't work" thing anymore? Call Thunder Racing; they have a highly competent staff. If they don't know the answer, they will yell at the guy who does to come get the phone haha. Talk to them, they made the cam, they know what it does. A buddy who talked to a guy that may have never even called them wont know. Thunder Racing will.

I am just happy that places like Thunder Racing and Texas Speed exist! Most speed shops are dumb, but these guys are hands on and want to help you.

The only issue I can see with the MS4 is maybe springs, but I have never run their springs, but I am about to. The MS4 has a much more aggressive lift, which could lead to impending spring failure. They seem to have one of the best springs out there, so the choice is up to you. The MS4 makes great power, and so does the TRex. If I had to choose one, it would be the TRex, and I did. Now, also take this into account. I don't know who has had any issues with this cam, at all. I don't run it, nor do I intend to. I am just speaking from a technical point of view, in that the cam is larger, so you can do the math. I do know that the power it makes is scary, and is definitely a prospect for top dog status.

 

i couldnt of put it in better words man.

this guy here knows wats up and wat he is talkin about.

 

How about a custom T-Rex with an LSK lobe on the intake side?

 

Thank you.

BTW, here is my piston after running a TRex to 7,000rpm. No damage to any piston other than the ones with the spun bearings. (Creates slack so that the rod allows the piston to reach higher than originaly intended. In this case it actually hit my cylidner head, as you can see by the obvious outline of the combustion chamber.)

 

What springs were you running?

 

I was running Comp 921's but, my spings has ZERO reason as to why this happened. This only happened because of the spun bearing. Every other piston was perfect.

 

How many passes did you make spinning the motor to 7000 rpms

 

Well over 100, and regular street use.

 

All the 440-450whp cars... they running which intake? FAST? Ported FAST?

 

Most of the cars I have seen have actually been on an LS6 intake. That is a bit scary to me, seeing that the LSX loves the TRex! I am slow though. I couldn't break into the 10s with a ported FAST 90/90, TRex, and a Yank 4400. Some people do it like it's nothing! haha Then again, I am very close to stock weight, so it's kinda tough to do.

I would love to see Texas Speed, Thunder Racing, and Vengeance Performance each build a car to break the cam only record. I feel it would be pretty interesting. It would also push each manufacturer to assess their cams, and possibly alter them if they needed. It would be even more interesting if they could get one to go in the 10-teens with their cams off the shelf, only using parts they sell on their sites.

 

Well said. Any time I get the "will it work" question I reply with yes, but youshould always verify PTV clearance and degree this cam. Each cam comes ground with very slight differences due to the grinding.