302 / 375 Horsepower Engine.
Below is a list of frequently questions and concerns
What is the difference between the 302 / 373HP and the 302 / 375HP engine ?
The 375HP / 302 has a heavier duty Piston and Steel Beam Connecting Rods. It could be more beneficial for those who are running occasionally Nitrous.The engine can withstand a higher Redline by about 500RPMs from our other 302 engine offers..
What application vehicles would this engine work best with ?
This engine will apply to a wide range of year, make and models. For instance Early to later model Mustangs, Kit Cars, Hot Rods & Trucks to name a few. We'll match up the necessary components to your vehicles requirements. For Example a 1966 V8 Mustang will require a different oil pan, flywheel, harmonic balancer and Water Pump than a 1985 Ford V8 Mustang!
What about idle quality and will I have enough vacuum to run my accessories ?
This is a pretty common question. We would rate this engine to have a more noticeable idle than our some of our other 302 engine packages. Still acceptable idle of approx. 1000-1100 RPMs for routinely drivin vehicles. Idle quality can be affected by a few things including whether you have a high Stall Speed Torque Converter attaching to your automatic Transmission or a Standard Transmission. Vacuum will be OK for running accessories like Air conditioning, Power Steering and Power Brakes.
What other engine will this engine interchange with ?
The 289 and of course another 302 will interchange very easily with this motor. Earlier applications like a 221 or 260 can work with some minor modifications. 4 and 6 cylinder conversions also a possibility. Speak to one of our sales / techs on this.
What octane gas does this engine require ?
All our engines will run on good quality pump gas. This engines compression is approx. 10 to 1 so it can run very comfortably within 92-94 octane range.
What is the Redline that this engine be taken up to ?
This particular engine we would suggest RPMs be kept to under 5800 RPMs.
What is the Power Range of the engine ?
2000 thru to 6000 RPMs Delivering a very broad power band!
Will my stock Transmission work with this engine ?
In most cases the answer to this questions is Yes. A great deal of our customers re-use or freshen up their existing transmission. For mostly cruising around and / or laying down some rubber once in a while the factory transmission will hold up fine. Those of you who are doing holeshots and abusing the crap out of your car (You know who you are!) you may want to step things up. We may be able to give you some ideas or just talk to a Tranny guy. If your without a transmission and looking for advice on which to choose from. A heavier duty C4, C6 or a modified AOD Automatic Transmission will do the trick. For Manual Transmissions there's a lot available like the popular Tremec 5 or 6 speeds.
Will I need a higher Stall speed torque Converter to compliment this engine ?
This question applies to Automatic Transmissions only. A stepped up converter (2200-2400 range) will usually give you quicker acceleration off the line. The use of the vehicle has a lot to do with this too. Is it a grocery getter or Street / Strip application ?. Other factors like the weight of car or truck, gearing , tire size also come into play too. Speak to a Transmission expert on this.
Will it be required to change out my Rear End & What Rear end and Gearing is recommended with this engine ?
Your existing gearing may be just fine. This can always be changed out after the engine is installed. For the most part a rear end gear ratio of 3.55 up towards 4.11 would be ideal. The higher the numeric number the faster off the line power the car or truck will have when you hit the throttle, but RPM cruising speed goes up as well. So sometimes bigger is not always better. Determining the RPM range that you drive in most will help you make a more informed decision. Speak with a Rear end expert for some assistance on this matter.
Can I use my existing Exhaust manifolds? Are Headers required and what diameter should be used ?
Yes, you can bolt up your existing exhaust manifolds and in most if not all occasions that will be a direct fit. An engine performs much like an air pump the more efficient the air and fuel is delivered in and exits out the better and more responsive it will become. Headers could free up approx.15 Horses over stock Manifolds. The Edelbrock Aluminum Cylinder Heads on this engine have the same factory bolt pattern to work with pretty much any standard Header. A general idea on Header sizes would fall in place of 1" 5/8 to 1" 3/4.
What size Radiator is recommended ?
Last but not least! This engine or any other engine we offer needs to run cool to expect long term results out of it. A used / older radiator that has been sitting around is not worth cleaning and reusing . A new 3 or 4 core Radiator is a cheap investment compared to an overheated $5,000.00 engine! It's worth the investment to spend a couple of hundred bucks initially to get a new radiator. Pay a little now or pay Later philosophy. There's plenty of good Radiator companies out there
Back to the 302 / 375 HP Carbureted Engine
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