If you're going to go to the trouble of swapping heads on a non-PI SOHC car, why would you NOT swap to trick-flow heads?
Non pi supercharged ?
So do the heads really make a big difference with the pi heads vs non pi. and what kind of numbers do the non pi procharged bolt on car's make on 8 psi?
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Yes, they do make that big of a difference.
Im not swaping heads on anything. I was just wondering really if a supercharged non PI car would be worth buying. Im looking at a procharged one and kinda wondered what it would be capable of with non pi heads.If you're going to go to the trouble of swapping heads on a non-PI SOHC car, why would you NOT swap to trick-flow heads?
Most of the power is in the cams and intake.
Im running a novi with pi intake and cams on my 96.
Im running a novi with pi intake and cams on my 96.
What kind of time's are you getting out of it?Most of the power is in the cams and intake.
Im running a novi with pi intake and cams on my 96.
Just put the Paxton on this week, getting it tuned saturday should be around 400 rwhp
Thats another thing I was wondering is if it would actually make decent power or not. Probably wouldn't do very good against a cam only ls1 though would it?Just put the Paxton on this week, getting it tuned saturday should be around 400 rwhp
I had a 96 and at one point thought about a blower. However I soon realized that with a blower and NPI heads my shit would only be at about 300rwhp. Do the head swap.
No shit? That bad huh. I was thinking it would be close to at least 350 but I just found out it has stock manifolds too. Ouch. Its also running an fmu, thats a bad way at getting a good fuel ratio isnt it?I had a 96 and at one point thought about a blower. However I soon realized that with a blower and NPI heads my shit would only be at about 300rwhp. Do the head swap.
x2. Non-PI cars run like ass.Yes, they do make that big of a difference.
I had a 97 that the motor was stock on. I had a NOVI 1000 on it, made 12 psi at 6500 rpm and a safe pump gas tune made 330 rwhp(@400 crank hp). I had 4.30 gears w\ 5 speed and on street tires ran 8.12 in the 1\8th with a 1.90 60 ft. If I understand correct the pi swap will put the compression up pretty high as the non pi motors run a more compression height on the piston and a larger combustion chamber where as the pi heads have a small combustion chamber and dish style pistons. The pi's do flow a lot better than the non pi's also.
No bolt on-s?I had a 97 that the motor was stock on. I had a NOVI 1000 on it, made 12 psi at 6500 rpm and a safe pump gas tune made 330 rwhp(@400 crank hp). I had 4.30 gears w\ 5 speed and on street tires ran 8.12 in the 1\8th with a 1.90 60 ft. If I understand correct the pi swap will put the compression up pretty high as the non pi motors run a more compression height on the piston and a larger combustion chamber where as the pi heads have a small combustion chamber and dish style pistons. The pi's do flow a lot better than the non pi's also.
I JUST got done reading an OLD MM&FF about PI heads on a 98 4.6 and the car bone stock picked up 52.3 horse power to the wheels with the PI heads alone. I would say that PI heads are worth the difference. And since one can find a whole PI set up for around 500.00 why wouldn't a budget minded person use the PI heads?
On Horsepower TV the other day they put a non-intercooled Procharger on a non-PI 4.6L and it only made like 285rwhp and that was with longtubes and exhaust. Not sure how much boost, 6 or 8 psi I'm guessing.
I had the novi 1000, x-pipe and catback. The motor was stock other than injectors. I ran an in-tank 255lph walbro. I'd say it was a nice increase over the est 215 crank horse they were said to produce. In theory for every 1 bar or @14.8 psi or boost you can double the hp of the engine.No bolt on-s?
You can put a blower on a PI swapped 96-98GT...I did by getting thicker cometic gaskets which reduced CR by a full point. My GT made 417rwhp at 5psi.
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