What I'm saying is, if your going to strip down your car that far in the first place, you might as well go with some nice VT engine heads/cams, not the stock ford crap. Then you'll see better gains
Swaping heads is too much of a pain on the 4.6 motor compaired to the old pushrod motors, don't bother changing it for 5hp, its a waste of time.
Actually it's alot easier than swaping out 5.0 heads
And as for you saying 5hp, that's a joke
It depends on your future plans for the car I guess. Those who want to put a blower/turbo on it then keep the NPI heads. If you want to run nitrous then by all means put the PI heads on or something else that the compression bump won't affect.
5HP was ment sarchastically.
Honestly tho, there is NO FREAKIN WAY changing the heads on a 4.6 could be easier then a 5.0. I just looked it up in AllData. It is a hellish ordeal. I doubt you actually need to pull the motor out of the car to do it but thats what the instructions say you need to do. You do however have to disassemble the entire front end of the motor. Plus when you put it back together you have to re-synch the cams/crank.
On a 5.0, you still have to pull some of the accessory drive and the intake manifold but you don't need to yank the timing cover. The only extra thing is adjusting the valves once the new head is on and that is only if you have adjustable valves.
5HP was ment sarchastically.
Honestly tho, there is NO FREAKIN WAY changing the heads on a 4.6 could be easier then a 5.0. I just looked it up in AllData. It is a hellish ordeal. I doubt you actually need to pull the motor out of the car to do it but thats what the instructions say you need to do. You do however have to disassemble the entire front end of the motor. Plus when you put it back together you have to re-synch the cams/crank.
On a 5.0, you still have to pull some of the accessory drive and the intake manifold but you don't need to yank the timing cover. The only extra thing is adjusting the valves once the new head is on and that is only if you have adjustable valves.
If you got more, get the heads. Better flowing and more compression.
5HP was ment sarchastically.
Honestly tho, there is NO FREAKIN WAY changing the heads on a 4.6 could be easier then a 5.0. I just looked it up in AllData. It is a hellish ordeal. I doubt you actually need to pull the motor out of the car to do it but thats what the instructions say you need to do. You do however have to disassemble the entire front end of the motor. Plus when you put it back together you have to re-synch the cams/crank.
On a 5.0, you still have to pull some of the accessory drive and the intake manifold but you don't need to yank the timing cover. The only extra thing is adjusting the valves once the new head is on and that is only if you have adjustable valves.
The flow isn't that major of a difference. Yes, they flow better, but not a whole lot better. Also, since he plans on supercharging it, he doesn't want the added compression.
They flow more. Flowing more equals more power. I never said that they will make you blow an ls7 away.
More compression equals more power. I was talking about in general information.
Of course he won't want it with a supercharger but PI Heads add power!
If you can afford the heads, get them. If you can't afford them, don't get them. It is that simple.
No it's not that simple, you have to know your future plans to know what route is best. Why spend the $300+ on heads to get a 10.5:1 or higher compression ratio when he plans on supercharging it anyways? Thats wasted money on the heads because he won't be able to add much boost at all and will therefore be limiting the power potential. If he planned on staying NA or was going to run nitrous then YES, get the PI heads and love every second of that added compression ratio. Since he wants boost, and high compression + boost = kaboomskies, why waste money on SLIGHTLY (read very little improvement) better flowing PI heads when you can more than make up for that with the blower.
Sorry this may be a little off topic, but is it possible to P&P a set of NPI heads so that the NPI head's intake ports match the PI intake ports? Has anyone done this, and what are the gains over doing just the intake swap?
I have been offerd some PI cams and springs for $35 plus shipping, so i wanted to know if it will help performance wise?
If you read, I said 'in general', NOT to this poster!
A little bowl work and 03 4v Cobra Headgaskets will fix it.
I got my heads for well under $100, with 40k.
In general, if you can afford the heads get them, if you can't afford them, don't. It is that simple.
Blower is different scenario. You could rebuild and throw in some dished pistons with a rebuild, if you got the dough.
Show me a chart of flow between the two headsI'm not for sure if you know how to 'read' head flow charts. For example, (not referring to PI vs. non-PI), 20-30cfm at .500 lift is a nice gifting potential.
PI Heads & PI Intake go better than Non-PI heads & PI intake.
Easier to read...................Stock....Stock....P&P......P&P
Lift in Inches '96.......'01.......'96.......'01
.100 --------- 46 ....... 54 ...... 61 ...... 60
.150 --------- 66.6......78....... 89 .......86
.200 --------- 84.5..... 98 .....111.5 ....116
.250 --------- 103.5... 119 ...131.3 ....141
.300 --------- 121.3... 135... 146 ......160
.350 --------- 134.7 ...145 ...159.6 ...169
.400 --------- 147 ......156... 173.3... 176
.450 --------- 159.4... 161 ...185 ......182
.500 --------- 170 ......166 ...188 ......185
.550 --------- 176 ......168... 192.5 ...186
Part Identification 1996-01**
Tests were performed on a SF600 at 28" of water... Mild portwork to both heads same size valves compare apples to apples
is that what your looking for, i had one guy show that to me in the past...
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?