How much improvement to expect from some new heads.
#11
Senior Member
SENIOR BUILDER
Join Date: Sep 2007
Location: Div VI
Posts: 122
Originally Posted by woodsman
Originally Posted by superstreeter
I ran a set of 781 steel heads, with larger valves and some porting, then upgraded to the afr 305s,,,the car ran .15 quicker, pretty disappointing,,so don`t get your hopes up,,I think your going to need an extra 130 hp to get that goal, I have found that once you get into the 10s - 1/4 mile,,it takes about 20 hp to get an extra 10th
superstreeter we are think about changing heads on my brothers truck how much HP do we need to shave 3/10th.
#12
Senior Member
DYNO OPERATOR
Join Date: Mar 2007
Location: Texas
Posts: 525
Originally Posted by superstreeter
Originally Posted by woodsman
Originally Posted by superstreeter
I ran a set of 781 steel heads, with larger valves and some porting, then upgraded to the afr 305s,,,the car ran .15 quicker, pretty disappointing,,so don`t get your hopes up,,I think your going to need an extra 130 hp to get that goal, I have found that once you get into the 10s - 1/4 mile,,it takes about 20 hp to get an extra 10th
superstreeter we are think about changing heads on my brothers truck how much HP do we need to shave 3/10th.
#13
Senior Member
MASTER BUILDER
Join Date: Jul 2006
Posts: 184
At that et range, and power level, it takes a lot of power increase, to go even a little faster. On a similiar deal, except it was a 496, that made 752hp with 049 oval ports, they were VERY re-worked, and not a typical port job, but, the rest of the engine was very basic, after running 1 season with the oval ports, in the 9.30-40 range, depending on air, with a best of a 9.298 et, at 143-145, again, depending on air, for the next season, I did nothing else, except change to a set of mildy ported Canfield 310's, same intake, except ported to a rectangle port, which was a Victor-O 4500, same cam, same everything, only change was the heads, the car ultimately ran 8.989 at 150, with a string of 9.0's. I didn't dyno the engine after the head swap. But, I did dyno it later, and it made about 70 more hp than the ovals.
I would expect, if you got the right head, and I would suggest the new revised Pro-1's, either the 325's, or, the 345's. At 3000lbs, I think the 345's would be a better choice, as, they offer a bunch of easier future potential. A 325 head, can be made to basicaly make just as much power as a 345, but, it takes a bunch more work. THe meat is there, it just has to be removed.
I would also get a new cam. THat is a very conervative cam for a 540. With a cam, and head swap, I could see it making an aditional 100hp.
Frank
Advanced Performance
www.get-ap.com
I would expect, if you got the right head, and I would suggest the new revised Pro-1's, either the 325's, or, the 345's. At 3000lbs, I think the 345's would be a better choice, as, they offer a bunch of easier future potential. A 325 head, can be made to basicaly make just as much power as a 345, but, it takes a bunch more work. THe meat is there, it just has to be removed.
I would also get a new cam. THat is a very conervative cam for a 540. With a cam, and head swap, I could see it making an aditional 100hp.
Frank
Advanced Performance
www.get-ap.com
#14
Senior Member
RACING JUNKIE
Thread Starter
Join Date: Sep 2007
Posts: 4,137
OK..so if I go with a head in the 335- 345 cc range...what kind of camshaft specs should I be looking at for this combo? Keep in mind I want to keep the thing under 7000 rpm because I am poor and can't build a new motor overnight..lol. :lol:
#15
Senior Member
MASTER BUILDER
Join Date: Jul 2006
Posts: 184
I wouldn;t get to carried away on the cam, but something in the low 280 at .050 on the intake, and upper 280 to low 290 on the exhaust, with .775 intake lift, and .714-.720 on the ex. I personaly would run a 112 lobe sep. With the tighter lobe sep, it should equal the mid range tq of the old cam, but, it will make more hp up top.
Have you considered just re-working the heads you already have? You said they are un-ported correct? If thats the case, for A LOT less than new heads, you could pick up a bunch of power that way. A cam change, maybe an intake change, to a super Victor, or the smaller profiler, I wouldn;t use the big profiler for 7000rpm, but, a Super Victor, with some minor plenumn work, a port job, maybe bigger intake valves, and a cam, and you would go high 5's. And, the cool part, you could say, they are just some old 074 aluminumn heads, when your beating guys with Dart, Brodix, etc. You couldn;t imagine, how mad guys got, from my above example, with the 049 oval ports, how mad guys would get, when they got trailered by old junk truck heads, when they were running their cnc'd this or thats.
Frank
Advanced Performance
www.get-ap.com
Have you considered just re-working the heads you already have? You said they are un-ported correct? If thats the case, for A LOT less than new heads, you could pick up a bunch of power that way. A cam change, maybe an intake change, to a super Victor, or the smaller profiler, I wouldn;t use the big profiler for 7000rpm, but, a Super Victor, with some minor plenumn work, a port job, maybe bigger intake valves, and a cam, and you would go high 5's. And, the cool part, you could say, they are just some old 074 aluminumn heads, when your beating guys with Dart, Brodix, etc. You couldn;t imagine, how mad guys got, from my above example, with the 049 oval ports, how mad guys would get, when they got trailered by old junk truck heads, when they were running their cnc'd this or thats.
Frank
Advanced Performance
www.get-ap.com
#16
Senior Member
MASTER BUILDER
Join Date: Oct 2004
Location: Newport News, VA
Posts: 139
Originally Posted by Tod74
OK..so if I go with a head in the 335- 345 cc range...what kind of camshaft specs should I be looking at for this combo? Keep in mind I want to keep the thing under 7000 rpm because I am poor and can't build a new motor overnight..lol. :lol:
Comp Cams 11-734-9
Operating Range: 4500-7300 RPM
Duration Advertised: 313° Intake / 322° Exhaust
Duration @ .050'' Lift: 278° Intake / 286° Exhaust
Valve Lift w/1.7 Rockers: .748'' Intake / .714'' Exhaust
Valve Setting: .028'' Intake / .030'' Exhaust
Lobe Separation Angle: 110°
Comp Cams 11-740-9
Operating Range: 5000-7500 RPM
Duration Advertised: 321° Intake / 336° Exhaust
Duration @ .050'' Lift: 286° Intake / 298° Exhaust
Valve Lift w/1.7 Rockers: .748'' Intake / .748'' Exhaust
Valve Setting: .028'' Intake / .030'' Exhaust
Lobe Separation Angle: 112°
George
#17
Senior Member
RACING JUNKIE
Thread Starter
Join Date: Sep 2007
Posts: 4,137
Originally Posted by gdmii
Originally Posted by Tod74
OK..so if I go with a head in the 335- 345 cc range...what kind of camshaft specs should I be looking at for this combo? Keep in mind I want to keep the thing under 7000 rpm because I am poor and can't build a new motor overnight..lol. :lol:
Comp Cams 11-734-9
Operating Range: 4500-7300 RPM
Duration Advertised: 313° Intake / 322° Exhaust
Duration @ .050'' Lift: 278° Intake / 286° Exhaust
Valve Lift w/1.7 Rockers: .748'' Intake / .714'' Exhaust
Valve Setting: .028'' Intake / .030'' Exhaust
Lobe Separation Angle: 110°
Comp Cams 11-740-9
Operating Range: 5000-7500 RPM
Duration Advertised: 321° Intake / 336° Exhaust
Duration @ .050'' Lift: 286° Intake / 298° Exhaust
Valve Lift w/1.7 Rockers: .748'' Intake / .748'' Exhaust
Valve Setting: .028'' Intake / .030'' Exhaust
Lobe Separation Angle: 112°
George
#18
Senior Member
SENIOR BUILDER
Join Date: Sep 2007
Location: Div VI
Posts: 122
after running 1 season with the oval ports, in the 9.30-40 range, depending on air, with a best of a 9.298 et, at 143-145, again, depending on air, for the next season, I did nothing else, except change to a set of mildy ported Canfield 310's, same intake, except ported to a rectangle port, which was a Victor-O 4500, same cam, same everything, only change was the heads, the car ultimately ran 8.989 at 150, with a string of 9.0's. I didn't dyno the engine after the head swap. But, I did dyno it later, and it made about 70 more hp than the ovals.
"Thats about what I would figure..you picked up 3 1/2 - 10ths, and it took 70 hp,, thats 20 hp per 10th"
"Thats about what I would figure..you picked up 3 1/2 - 10ths, and it took 70 hp,, thats 20 hp per 10th"
#19
Senior Member
RACING JUNKIE
Thread Starter
Join Date: Sep 2007
Posts: 4,137
Originally Posted by superstreeter
after running 1 season with the oval ports, in the 9.30-40 range, depending on air, with a best of a 9.298 et, at 143-145, again, depending on air, for the next season, I did nothing else, except change to a set of mildy ported Canfield 310's, same intake, except ported to a rectangle port, which was a Victor-O 4500, same cam, same everything, only change was the heads, the car ultimately ran 8.989 at 150, with a string of 9.0's. I didn't dyno the engine after the head swap. But, I did dyno it later, and it made about 70 more hp than the ovals.
"Thats about what I would figure..you picked up 3 1/2 - 10ths, and it took 70 hp,, thats 20 hp per 10th"
"Thats about what I would figure..you picked up 3 1/2 - 10ths, and it took 70 hp,, thats 20 hp per 10th"
Originally Posted by superstreeter
I ran a set of 781 steel heads, with larger valves and some porting, then upgraded to the afr 305s,,,the car ran .15 quicker, pretty disappointing,,so don`t get your hopes up,,I think your going to need an extra 130 hp to get that goal, I have found that once you get into the 10s - 1/4 mile,,it takes about 20 hp to get an extra 10th
#20
Senior Member
RACING JUNKIE
Thread Starter
Join Date: Sep 2007
Posts: 4,137
Originally Posted by Pwmax
I wouldn;t get to carried away on the cam, but something in the low 280 at .050 on the intake, and upper 280 to low 290 on the exhaust, with .775 intake lift, and .714-.720 on the ex. I personaly would run a 112 lobe sep. With the tighter lobe sep, it should equal the mid range tq of the old cam, but, it will make more hp up top.
Have you considered just re-working the heads you already have? You said they are un-ported correct? If thats the case, for A LOT less than new heads, you could pick up a bunch of power that way. A cam change, maybe an intake change, to a super Victor, or the smaller profiler, I wouldn;t use the big profiler for 7000rpm, but, a Super Victor, with some minor plenumn work, a port job, maybe bigger intake valves, and a cam, and you would go high 5's. And, the cool part, you could say, they are just some old 074 aluminumn heads, when your beating guys with Dart, Brodix, etc. You couldn;t imagine, how mad guys got, from my above example, with the 049 oval ports, how mad guys would get, when they got trailered by old junk truck heads, when they were running their cnc'd this or thats.
Frank
Advanced Performance
www.get-ap.com
Have you considered just re-working the heads you already have? You said they are un-ported correct? If thats the case, for A LOT less than new heads, you could pick up a bunch of power that way. A cam change, maybe an intake change, to a super Victor, or the smaller profiler, I wouldn;t use the big profiler for 7000rpm, but, a Super Victor, with some minor plenumn work, a port job, maybe bigger intake valves, and a cam, and you would go high 5's. And, the cool part, you could say, they are just some old 074 aluminumn heads, when your beating guys with Dart, Brodix, etc. You couldn;t imagine, how mad guys got, from my above example, with the 049 oval ports, how mad guys would get, when they got trailered by old junk truck heads, when they were running their cnc'd this or thats.
Frank
Advanced Performance
www.get-ap.com