i know the eagle heads can have the short turn and throat opened up as large as you want if you are willing to change out seats. i have seen a set of eagle heads that someone installed new seats and a 2.19 intake valve. so i would assume the 6.1s would be the same. with the stock seat the size is limited to 2.10. a apache head is the size of a ported 6.1 head from the factory. just my opinion, but i would sell the 6.1s and buy some apaches. i think youll save a bunch of money in the long run when your talking about running a valve that size. [/quote]



Well, the one thing I have plenty of is time so I'll think it over. Given that I'll have to replace the seats in either head to accommodate titanium valves, that makes me less enthused to make the change and sell my heads because of the possible lost value selling in today's market. I'll keep my eye out, I maybe able to find a decent deal on some 6.4L heads such that I can make that upgrade.

They came from a guy in Omaha, he said they came from PWR but the valve springs they had were a mystery, orange striped, and PWR didnt claim them as theirs. PWR has since went bad anyway. All I know is they had fresh Manley valves in them, bronze guides,were definitely CNC'd and I put Manley springs with some moly Comp retainers on.

Travis Knowlton did a set of 5.7 heads for me a few years ago. They have been flawless. He and Chuck Lofgren joined forces a year or two ago. I'm sure he could fix you up.

Well I prefer a weight and mph number as well. That's the only way to tell real hp. Unfortunately I have been fighting to find a trans and converter that will live when I spray the motor so all I have until that is rectified is a chassis dyno number. Naturally aspirated on 93 octane pump gas the car makes 700 rear wheel horsepower. I [censored] approx 7500 and run a custom sheet metal intake with a 168mm tbody. I have not had a chance to spray the motor yet because of the trans and converter issueS. They should be fixed in the next few weeks and i will have a chance to get it to the track. I drive it the 65 mile round trip to the track and back. It weighs 4300lb with me in it

Wrong converters, gears, shift points, aerodynamics, alignments (ever try pushing a car around the shop with a bad alignment then again after getting it fixed?) and much more can affect mph. How many times have we seen guys pick up big MPH after finding a fuel delivery problem? The only thing MPH VS weight calculators can tell you is how much HP (roughly) was put to use. It will not tell you how much your engine makes, more of a minimum. If your engine dyno was corrected properly and made 800 hp but the calculator says 400 hp that means you have some major CAR issues needing fixed. Would a 3000 lb studabaker hawk run the same MPH as a 3000 lb D-100 with the same drivetrain? They are both useful tools but should never be taken as gospel.

462hemi, your engine sounds bad ass

Hotroddave, could you please give me your mph and weight? Thank you

Thank ya sir

No race tracks around here so I have not raced in nearly a decade but when I did race back in Tennessee I saw guys say they had this or that HP and it never added up but when you see the same engine go from a well set up car to a poorly done one and lose a bunch of HP based on the "calculators" you would see it did not always add up. I personally saw a guy sell his buddy a proven engine and he put it in a piece of crap car and it ran a lot less HP based on the calculations even though it was not the engines fault, it was the same from air cleaner to oil pan. I am not saying dynos are perfect or the calculators but it is pretty obvious stuff needs to be set up right or you are not getting acurate figures. Try taking a car out one time and shift 1000 RPM early every time and see for yourself if MPH is off, I promise you it will be. Calculating the HP off weight and MPH is a tool just like a dyno a wrench or socket. A guy may have a 600 HP engine but the calculator says 300 he may be telling a big one or his junk might be set up wrong.

I know what you guys are getting at, you think I am recomending racing dynos but I ain't. All I am saying is both dynos and calculators can give false numbers, a dyno just gets a bad rep because you can fudge it and get higher numbers, the calculator you can screw things up and get lower numbers but not higher(unless you lie about your temperature, altitude weight or MPH of course). Of course all that ever mattered when I raced was elapsed times don't know what you guys are doing these days, sounds like maybe the highest MPH is all that matters.