Need some speed
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New User
Joined: Sep 1999
Posts: 14
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Need some speed
I have a 1993 F-150 with the 300-6. I just recieved a Clifford performance catalog.I will be buying headers and Gibson dual exhaust. What would be better, buying a 4-barrel manifold and a carb, or keeping it MPI and getting a K&N filtercharger?which would give me more power?
P.S. GO FORD
P.S. GO FORD
Post Fiend
Joined: Jan 2000
Posts: 5,860
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From: Metro Detroit (Redford)
Need some speed
I understand the MFI manifold on this engine is tuned for maximum low end torque truck power. I have a 95 F150 and there is no way I would remove the MFI to go carburator. From my reading, a less restrictive exhaust, probably a cat back system, should have the best results and will make all other speed mods perform better. What I would consider for my truck would be a quiet (series 70) Flowmaster muffler and a performance computer chip. I am not sure how much a K&N will help on this low revving engine, perhaps with the whole intake kit, but with the filter alone I didn't notice any change.
Elder User
Joined: Nov 1999
Posts: 780
Likes: 1
Need some speed
Go buy one of the 3-in. dia. cat-back exhaust systems, i.e., Flow Master, Gibson, et al. I bolted on a Gibson single a few years back and I really felt the kick in the pants. It went on easily, took less than a six pack, and best of all, really worked. Cheap, too, though if I had to do it over I'd go stainless steel.
Eddie
Eddie
Post Fiend
Joined: Jan 2000
Posts: 5,860
Likes: 4
From: Metro Detroit (Redford)
Need some speed
At what RPM do you get the kick in the pants from that exhaust. My stock '95 F150, 300 six has a kick in the pants that comes in at 2000 RPM, which happens to be the torque peak. Below that RPM it could use a boost.
Freshman User
Joined: Jan 2000
Posts: 41
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From: Montana
Need some speed
Tallpaul you have taked about computers in different posts but I haven't found one that didn't uses prenium fuel only .If you have please post the manufacture or vendor's name.
The comp cams 252 432 lift 112 split is the best thing we have done to our pickups. the fuel injection is compatible with this cam.
The comp cams 252 432 lift 112 split is the best thing we have done to our pickups. the fuel injection is compatible with this cam.
Post Fiend
Joined: Jan 2000
Posts: 5,860
Likes: 4
From: Metro Detroit (Redford)
Need some speed
I haven't heard about premium fuel being necessary. When my mechanic suggested a performance chip for my wife's 3.0 v6 Aerostar, I asked him that question and he said I would not need premium. Wouldn't the computer just make adjustments depending upon the fuel used? If so, then you probably would get a performance edge with premium, but not necessarily need premium. But, you had better call the manufacturer and ask them.
Now I have a question for you (purely academic for me, but somebody may want to do it). Can the performance of a 300 I6 be improved withoug changing the cam bu adding higher ratio rocker arms for greater valve lift? As I understand, for truck torque at low RPM lift is the key and you don't really want to add to duration. Can this be done to a 300 six without the valves interfering with the pistons?
Now I have a question for you (purely academic for me, but somebody may want to do it). Can the performance of a 300 I6 be improved withoug changing the cam bu adding higher ratio rocker arms for greater valve lift? As I understand, for truck torque at low RPM lift is the key and you don't really want to add to duration. Can this be done to a 300 six without the valves interfering with the pistons?
Posting Guru
Joined: Dec 1999
Posts: 1,903
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From: Copley, OH
Need some speed
Unfortunately, nobody makes them. Crane, Clifford and Harland Sharp all offer roller rockers for the 300, all with the standard 1.6 ratio. If you've got a source, let us know.
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Freshman User
Joined: Jan 2000
Posts: 41
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From: Montana
Need some speed
There was a post by someone who raced 300 six's stating the heads from the clevland era had inter changable valve train components with the clevlands. I can't find the post but I'm considering taking a head to the machine shop and asking how much it would cost to make the change.Combustion chamber designs are my biggest concern since I want to stay with the FI and the picky vacum limits by the computer. Ford has had some of the best combustion chamber design but haven't aplied them to many of thier engines HENCE BAD GAS MILAGE AND AIR PUMPS ON THE POLUTION CONTROL. This really pisses me off the old ford nascar small block heads are hard to tell from the new chevy sb2's when thier laying side by side. the 52 cc combustion chamber and dish piston is 20 yr old ford technology.
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