The RPM heads will match up with the equipment you have nicely. The threads have steel inserts. They flow about the same as 165s for less money. For your listed requirements, I think the RPMs with the 1.90 intakes are a really good choice.
I know very little about twisted wedge heads, so "no comment".
I know very little about twisted wedge heads, so "no comment".
Max Power said:
I have the RPMs with the 2.02 intake valve and the 1.60 exhaust valve. If you get these heads and later find yourself wanting just a bit more power, you can find another 40-50+ hp in them by sending them in for porting. These are what my flow numbers are supposed to look like according to Avenger Cylinder Heads after they are ported. These numbers are better than the "as cast" Victor Jr. heads and are about the same as the Trick Flow Rs. However, the CNC ported TW heads flow better.
Edelbrock 60259 head flow numbers Before CNC program
Intake/Exhaust .100" 70/57
Intake/Exhaust .200" 128/104
Intake/Exhaust .300" 183/142
Intake/Exhaust .400" 219/163
Intake/Exhaust .500" 251/170
Intake/Exhaust .600" 255/174
After the CNC program
Intake/Exhaust .100" 79/61
Intake/Exhaust .200" 145/121
Intake/Exhaust .300" 198/168
Intake/Exhaust .400" 241/178
Intake/Exhaust .500" 279/196
Intake/Exhaust .600" 284/205
I should pick up a few hp here and there.
68keyblr said:
a bit of both but it is also a function of your cam. My current cam stops making power at 6k rpm which is ok because my heads in their current form do not flow any more after .550 anyway. with the CNC program, the numbers keep climbing and with a bigger lift cam, you would see higher peak HP at a higher RPM as well as higher numbers at lower RPM. I expect to lose some low end torque but not enough to be worried about. The bottom line is that your average hp over your RPM range increases with the porting.
trick flow's. Best street head ever IMO, not a bad race head either. Small ports make for big torque and great throttle response.
There is a chart at the bottom of Stan Weiss's head page that shows displacement and cfm with respect to rpm of peak power.
also, think of lift as torque, and duration as horsepower. A cam with .600 lift and 190* dur at 50 will be a torque monster, but a cam with .480 lift and 260* dur at 50 will be a horsepower/hi rpm cam. When you increase both lift and duration, you increase horsepower and torque while also raising the rpm range.
With all that being said, a nice set of aftermarket heads would be almost a waste on a street only car.
There is a chart at the bottom of Stan Weiss's head page that shows displacement and cfm with respect to rpm of peak power.
also, think of lift as torque, and duration as horsepower. A cam with .600 lift and 190* dur at 50 will be a torque monster, but a cam with .480 lift and 260* dur at 50 will be a horsepower/hi rpm cam. When you increase both lift and duration, you increase horsepower and torque while also raising the rpm range.
With all that being said, a nice set of aftermarket heads would be almost a waste on a street only car.
Another vote for TW heads, if you want to spend the money I would go with the 185cc CNC ported TW. One of the highest flowing 185cc heads out. Also has good mid lift numbers for good mid range. Makes a great street head. For a purely street driven 302 185cc is probably the biggest intake port I would go to keep port velocity up.
Torque doesn't mean anything as far as how fast the car will be, but if you want more low rpm power, I think stroking is a better way to go than heads. It will cost more than heads, but with the correct tune and a stroker kit your car will have significantly more torque, as well as low rpm power.
The factory heads are made to flow below 5k rpm already. Heads that flow more will allow the engine to spin faster and will give the biggest gains at higher rpms. The same thing is true of bigger carbs and high rise intakes like the RPM. It's called RPM because it's for higher rpms. Get it?
Having said all that, you can gain some power with new heads, even at lower rpms. If you are really set on buying heads, you want to keep the runner volume on the smaller side.
The factory heads are made to flow below 5k rpm already. Heads that flow more will allow the engine to spin faster and will give the biggest gains at higher rpms. The same thing is true of bigger carbs and high rise intakes like the RPM. It's called RPM because it's for higher rpms. Get it?
Having said all that, you can gain some power with new heads, even at lower rpms. If you are really set on buying heads, you want to keep the runner volume on the smaller side.
68keyblr said:
The Canfield is much like a TW HIGH PORT head.
They have VERY high velocity port design..........they will work well and allow you to grow.
I have them on my 393..very impressed so far.
I had edelbrock rpm heads on my last 351w.I also was VERY happy with those, stick a TFS Stage 1 cam with them and it will scream.
BUT, for $1195.00 I got the Canfield's from Jay Allen at camshaft innovations, with Ferrea race series valves and the springs I needed! Edelbrock uses crapola Pioneer valves and springs.