Is anyone out there using Comp Cam phaser limiter or lockout blocks on their dual-duty street/track car? In the process of planning and doing a rebuild and just curious of everyone's direction. Comp stage 2 SPR likely going in.
Thanks everyone.

I ran lockouts in 2021 - car lost a lot of low end power and torque - like 75hp. but the power band was super fun on the road course. Not super fast, tho.


FWIW - I run the L&M Engine cams and we didn't see any issues with VCT under any conditions.

I make 585 whp and turn 8500rpm, FWIW

I talked this over with a former Ford engineer who still runs in A sedan, unless the motor is really modded, he doesn't recommend getting rid of the cam phasers for the reasons stated above. They are pretty bullet proof (the Ford ones, not the aftermarket ones) and locking them out kills the bottom end. I his opinion, locking them out does solve a potential weak point, but the engine parameters have to be changed to work around the lack of phasers, do-able, with enough money, the right cams and tune, but for the most of us, and most race organizations, the VCT should be left alone.

Depends on which cam you choose. I just installed the #500 cam which requires springs and limiters. It’s a lot more lift than stock so when Comp says phaser limiters are required I believe them. Sounds nasty see my build thread. I have had it on track yet waiting for the tuner.

blacksheep-1 said:

I talked this over with a former Ford engineer who still runs in A sedan, unless the motor is really modded, he doesn't recommend getting rid of the cam phasers for the reasons stated above. They are pretty bullet proof (the Ford ones, not the aftermarket ones) and locking them out kills the bottom end. I his opinion, locking them out does solve a potential weak point, but the engine parameters have to be changed to work around the lack of phasers, do-able, with enough money, the right cams and tune, but for the most of us, and most race organizations, the VCT should be left alone.

Click to expand...

this echos my experience. To actually make the most power, you need to otpimize all of the pieces...have to get the right cam profile and the right cam timing dialed in with the tune....and that can mean adjusting the came timing a few times (manually) on the dyno. In my case, we undershot redline a bit and it was a bit peaky. Not end of the world, but we could have made a bit more power adjusting where they were locked out.

The bigger challenge, IMHO, is you basically have to start from scratch since no one has a plug and play option.

Heads, valves, springs, cams, intake, displacement, compression, and exhaust all influence - so you need to optimize cam lockouts to make the best power for your build based on all that. lots of dyno time unless you get lucky

I get the premise of timing the advance or retard for different power. But, I chose the 127500s for my new rebuild. I believe with the lift and duration numbers, Comp says to use limiter. I thought I read somewhere that the Ford Performance timing kit cannot use limiter from CC. Maybe I misread? Also read that Livernois lockout or BBR lockout set either full advance or retard. Decided on a stroker kit lower end. Just want a reliable track car I can drive home. No need for ridiculous numbers.

Do you have a 4.6? I will say my experience is with a 5.2L, which have improved phasers.