There was a guy floating around here pretty regularly back in 1999 that was almost the first to try any and everything.

The guy was out of Houston and he had a set of heads built up, I think it cost him over $2000 and he never spoke a word about them that is until he sold them off to another forum member, and absolutely nothing was mentioned ever again about those heads. I suspect a total failure.

Next I think another member put a Crane(sp) cam in and again nothing was ever heard from that project either?

BTW, what ever happened to topgun38, with the dual supercharger, again fell off the face of the earth?

 

Sal,
I will ask the Mustang guys tomorrow! They sit one row over from me. I was told they were not the same! I'll get with them to verify.

 

BfB, I am pretty sure that the SVO heads got kicked to the side when the PI (power improved) heads came out in 99. That's where the Stang got it's extra hp from, and all the Triton truck motors got a boost as well. Since the PI heads, I haven't heard much of anything on the SVO heads.

Thor, please do!! Correct information is always the best! I had my parts guy check when I built the last motor in the 99. According to the Ford Parts computer, they were the same.

 

I myself am a little confused with the head matter. I am looking to swap out the heads on my 97 5.4 and fordparts online said the PI heads were not interchangable with standard heads. I got one reply last time I posted and the person said they were. I just wanted to know if any of you knew if the headswap could be done and if not why would they not be interchangable?

 

I sounds like an expensive proposition to run the Navigator heads. It will probably require a sheet metal intake. Come to think of it, you might as well mekr that sheet intake fit an 8-71 and be done with the eaton!

 

HI!... I've currently got a "98" 5.4 crate engine that I've put "99" 5.4 "P.I" heads on. They bolt right on. You will have to run the "99" 5.4 intake though because the "P.I" heads have different shaped intake ports. I have pics of the comparision between the "P.I" heads and the non "P.I" heads. You can clearly see the difference. I don't have the faintest idea how to post pics on here so if someone wants to do it for me, my e-mail address is in my SIG. As for the SVO heads, they are pretty much the 'P.I" heads. Bigger exhaust/intake valves and revised cumbustion chamber and ports. SEAN HYLAND MOTORSPORTS gets really good results with porting/polishing the "P.I" heads, about 40H.P increase, but that is on NATURALLY ASPERATED engines, not S/C ones.

 

The way I understood it when ford made the PI heads the pretty much copied the SVO head except for the valve offsets and the oversize intake and exhaust valves. The PI heads were supposed to be worth around 25hp over the 98 heads and the SVO heads are rated at a 35hp increase( I assume thats over the 98 heads).

I've had a good look at the lightning heads and I don't see 40 hp in a port job. Even the stock valves are shaped properly. There's room for a little clean up but not much. Somebody mentioned getting 275cfm out of the intakes. I think that would be a stretch, cause they only flow about 175 stock.

By the way, lightning (gen II) cam specs were listed in the winter 2000 NLOC news letter and they were,

Intake Exhaust
Lift Dur Lift Dur
.504 185* .531 192*

The mod motor heads don't flow a lot of air, but what they do flow is of very high quality. They seem to be designed with high swirl/tumble in mind. And they seem to work very well when you apply a little boost to them. It seems as if a little bit of boost goes a long way. I used to think my turbo buick made a lot of power for the parts that I was using, but this little truck motor is really suprising me.
My .02
Dale

 

Neal-
Your sig is 61 lines long I've got too much time on my hands for counting, though .

 

Crane will regrind your cams for you to allow 6000 rpm and it does move the power band a little higher (about 450 rpms). Porting and polishing will give you a slight increase in power, but not a lot for the money. But then what do I know?

 

Hey sal,
You were right! I spoke with the Mustang tech today. Our heads are all the same. Ya learn something new everyday! They are built at the Windsor plant. You have a good parts guy! LOL.

 

There are a dozen or so ads each month in MM&FF that advertise ported heads for the 2V GT's...are you saying we could use those? Those cam regrinds have me curious, also

 

I think BaBolt and High Risk (and others) have done work on cams and heads without significant success. The blower pressure seems to overcome a lot of porting, valve size and cam profile/lift deficiencies. Do a SEARCH on 'BaBolt' in the User Name field and 'heads' or 'cams' in the Keyword field, you'll find threads like:

https://www.f150online.com/forums/sh...ighlight=heads

 

His (BaBolt) heads are on my truck. When you port the heads you do loose a little boost, about 1 1/2lbs. That there IS an improvement in HP pretty much shows that the porting DOES do something. As stated before, it is not a lot in and of itself. BUT, when you put a pulley/pullies on.....you get your boost back With better air flow. Along with long tube headers, and a few other goodies, there IS a pronounced increase in HP.

I am currently, again, increasing my airflow by putting on the 2001 intake on my truck (yes it can be done if you buy the intake, middle plate, and drill a couple of holes) and am looking forward to breaking into the __s...........................you figure it out, w/o nitrous.

Then comes the Venom!