D.Hearne said:Get the one's you can afford, you'll never know the difference. And anyone who tells you that he knows, is full of it. I seriously doubt anyone here has bolted on AFR's and any other competing head, back to back and could honestly tell you the difference, in either dyno numbers ( not pulled from some magazine article) and real life, seat of the pants feel.
Sorry dude, I would almost always agree with this one. But, I did try it with the butt dyno and then backed it with the track numbers.
My edelbrock RPM's were decked .035 for compression and I did a slight casting clean up and bowl rounding on them. So even there they had an advantage out of the box. They were awesome heads, and I have no complaints. But there AFR are that damned good!! I did gasket match them to the intake(edelbrocks are done from the factory), and get rid of the CNC marks and really polished the chambers for nitrous.
I knew the difference on the first drive I took. I brought the car up to 3k and floored it. The tires came loose and didn't hook til the middle of third. Nothing had changed but the heads.
At the track I didn't have 12sec67 275/50/15 to borrow so I use my own 255/50/16's. Mind you nothing changed but the heads. I went from a 2.07 60 ft. to a 1.89 and the 1/8 went from an 8.5 to a 8.3 and I picked up 3 mph. I did also go a rod that was 92 grams heavier a piece when I got the AFR's, but I'm sure that didn't help. The motor makes 360 ft/lbs to the rear. That's enough to make a few strokers jealous. This is why I push and push for AFR's 185 or 165. It cost me a difference of 400 dollars to sell my heads and buy the AFR's and I will never look back.
Never mind. It's just a matter of semantics and terminology. Strength is not power, by definition, and so on and so forth. The point you are trying to make is correct in concept, so let's forget about it.ratio411 said:reenmachine:
We are thinking the same, yet on different planes or something...
Torque is the strength you put on a lever, therefore I see strength as power. Do you agree?
Horsepower was originated by how long it took one horse to raise a set weight up a well shaft. The weight never changed, the horses did, but they were still just one horse... it was the time that was measured.
Max Power said:Interesting that the AFR 185s don't flow any better on the exhaust side than the 165s, especially considering that is where Fords need the most help.
Wonder where Performaer RPMs would go?
3200lbs 300hp to the rear wheels is a low 12 second quater mile, all things being good.To go 13 seconds flat or there about with the same 3200 pound car you need about 245 hp, at the wheels. Also AFR offers a 165 competition head that is just awesome.ratio411 said:No.
Subtract 20%
To go 13 with 3200 lbs, you need about 300 to the wheels.
Ok, so you've done the back to back thing.10secgoal said:Sorry dude, I would almost always agree with this one. But, I did try it with the butt dyno and then backed it with the track numbers.
My edelbrock RPM's were decked .035 for compression and I did a slight casting clean up and bowl rounding on them. So even there they had an advantage out of the box. They were awesome heads, and I have no complaints. But there AFR are that damned good!! I did gasket match them to the intake(edelbrocks are done from the factory), and get rid of the CNC marks and really polished the chambers for nitrous.
I knew the difference on the first drive I took. I brought the car up to 3k and floored it. The tires came loose and didn't hook til the middle of third. Nothing had changed but the heads.
At the track I didn't have 12sec67 275/50/15 to borrow so I use my own 255/50/16's. Mind you nothing changed but the heads. I went from a 2.07 60 ft. to a 1.89 and the 1/8 went from an 8.5 to a 8.3 and I picked up 3 mph. I did also go a rod that was 92 grams heavier a piece when I got the AFR's, but I'm sure that didn't help. The motor makes 360 ft/lbs to the rear. That's enough to make a few strokers jealous. This is why I push and push for AFR's 185 or 165. It cost me a difference of 400 dollars to sell my heads and buy the AFR's and I will never look back.
I disagree.fastcoupe68 said:3200lbs 300hp to the rear wheels is a low 12 second quater mile, all things being good. To go 13 seconds flat or there about with the same 3200 pound car you need about 245 hp...
2800 # 320hp 11 seconds all day long in a car that is efficient, disagree all you want.ratio411 said:I disagree.
320 rwhp in 3400# F-bodys (including mine) is good for 12.9.
My 2800# Maverick with 320 at the rear wheels would be in the 11's with your math. Trust me, it's not there.
3400 lbs loses .2 second or 20 rwhp to a 3200# car. So...
320 in 3400 lbs = 300 in 3200 lbs = ~13 seconds.
245 is way too low for 13 in my experiences...
In your favor though, there are too many variables... perfect traction, perfect track, perfect temp, perfect world, perfect driver... 245 might do it if you hold your head just so.
Dave
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