patriot performance head

[lx5.0maine]

hey what all do i need to put these heads on my car, the engine they came off have valve relifs, do i need them on my stock engine to put them on or is this for sumthin else? i want to put the pph on my car sunday they came with xe278-ah cams, will they bolt right on an go? if not can i swap the spings an cams into my heads an run them, my question is what are the valve relifs cut into the pistons for, well i know they are so they dont hit the pistons, do all the patriot heads need valve relifs cut into the pistons for them to work any help be great i hope put the on sunday thanks

 

[trinity_gt]

hey what all do i need to put these heads on my car, the engine they came off have valve relifs, do i need them on my stock engine to put them on or is this for sumthin else? i want to put the pph on my car sunday they came with xe278-ah cams, will they bolt right on an go? if not can i swap the spings an cams into my heads an run them, my question is what are the valve relifs cut into the pistons for, well i know they are so they dont hit the pistons, do all the patriot heads need valve relifs cut into the pistons for them to work any help be great i hope put the on sunday thanks

Start by getting a cylinder head changing kit from FRPP:

4.6L 2V Cylinder Head Changing Kit

As far as the cams go, the reliefs are there to provide clearance for the valves so you don't get PTV (piston to valve) contact. The 278s need them. Aside from having a nasty idle, there's not much going for these cams for a daily-driven car that doesn't see 6500+ RPM regularly. Check out MM&FF's test:

Comp Cams XE278AH Ford Mustang Two-Valve Test | Muscle Mustang & Fast Fords Magazine Article at Automotive.com

"The sizable jump in duration increased the peak power output to 394 hp. But before you get all up in arms and order these wild cam profiles for your stock Two-Valve motor, know that in addition to not fitting in stock short-blocks (insufficient piston-to-valve clearance), the peak torque was actually down to 379 lb-ft.

Not only was the peak torque production down, but the larger XE278AH cams actually lost power compared to the stock PI cams up to 4,600 rpm. Compared at 4,500 rpm, the XE262AH cams offered an additional 25 lb-ft over the larger XE278AH cams. Only out at 6,500 rpm did the wilder XE278AH cams demonstrate their superiority, offering an extra 77 hp over the stock cam and 21 hp over the milder XE262AH cams. For the vast majority of street applications, the smaller XE262AH would be the clear choice, but the XE278AH cams would likely offer quicker e.t.'s and a higher trap speed if you kept the revs up."

If the car is a street-driven DD, I'd toss/sell the 278s and find some 262s instead, put some beehive springs in the heads and go with that. Just degree the cams and don't worry about notching the pistons...

 

[lx5.0maine]

EDITED

 

[san~man]

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