Re: 511 tf270 cam, header, Intake, gear selection?
[Re: Dragula]
#2842623
11/06/20 04:30 PM
11/06/20 04:30 PM
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Joined: Aug 2006
Posts: 2,141 junction city oregon
viperblue72
OP
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OP
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Posts: 2,141
junction city oregon
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Drqgula it has the TA 4-speed with 2.47 1st gear. I’m thinking a4.10 with 30” tire. I run a 31.5" tire with 4.10 gear, and that's a bit much on the street....I would go 3.91ish.... Dragula I was thinking possibly the same thing for gearing. Thank you.
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Re: 511 tf270 cam, header, Intake, gear selection?
[Re: viperblue72]
#2842624
11/06/20 04:39 PM
11/06/20 04:39 PM
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Joined: Aug 2003
Posts: 43,277 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,277
Bend,OR USA
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The rocker arm ratio affects the motor from idle to peak RPM, do the math on how much increase in the net valve lift and then decide if you want more lift on the lobes or do it with the increase rocker arm ratio 1.5 X.420=.630 gross lift,1.6X=.672. I check the net lift at the retainers and it had closer to .700 net lift than .670 That cam pulled really hard all the way from a idle to whatever RPM I wanted to shift it at including up to 7800 RPM That motor exceeded my wildest expectations from day one with a set of ported big valve 906 heads all the way up to buying and using the CNC ported Eddy RPM heads and then with the dyno testing on both the Indy 440-1 and the Indy SR M.W. heads. The SR heads flowed 340 CFM at .700 lift and the 440-1 flowed 370 CFM at .700 lift, the 440 -1 heads made 50 HP more on my pump gas motor at a little higher 7500 RPM than the SR heads did at 7300 RPM More air and fuel in makes more power I didn't work on the Indy 400-3 intake for either set of the Indy heads, it made good power and torque with all the heads I had on that motor with the same rocker arms with the Eddy RPM and SR heads, same brand and ratio on the 440-1 heads On the head swap tests I used the same carb with the same jets and ignition timing, head change only, both Indy heads had the same 76.0 CC on the combustion chambers, same head gaskets also I did test both sets of the Indy heads on my higher compression ratio 526 C.I., 440 mule motor, the 440-1 made 845 HP at 7500 RPM on race gas and the SR made 775 HP at 7500 RPM on pump swill Good luck on your build, it should make a lot of power
Last edited by Cab_Burge; 11/06/20 04:44 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 511 tf270 cam, header, Intake, gear selection?
[Re: viperblue72]
#2842662
11/06/20 06:49 PM
11/06/20 06:49 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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As far as the lifter band uncovering, yes they can unless you bush the bores but I run the Isky solid body's so zero issues there......
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: 511 tf270 cam, header, Intake, gear selection?
[Re: viperblue72]
#2842796
11/07/20 12:22 AM
11/07/20 12:22 AM
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Joined: May 2019
Posts: 713 Lake Villa Il
INTMD8
super stock
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super stock
Joined: May 2019
Posts: 713
Lake Villa Il
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Next question. Do I have to worry about lifter coming out of bores too far and uncovering the oil band?
Yes, I measured this on mine. Many different lifter designs out there so that matters as well as the cam base circle. Based on the hyd flat tappet cam I had, discussed how much room I had to decrease the base circle with the cam grinder and how much room I had from there for lobe lift without uncovering the oil gallery. With an MP hemi block, unbushed, .430 intake lobe lift I'm only about .020 away on each end from uncovering the oil gallery.
69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
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Re: 511 tf270 cam, header, Intake, gear selection?
[Re: INTMD8]
#2842811
11/07/20 12:49 AM
11/07/20 12:49 AM
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Joined: Aug 2006
Posts: 2,141 junction city oregon
viperblue72
OP
top fuel
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OP
top fuel
Joined: Aug 2006
Posts: 2,141
junction city oregon
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Next question. Do I have to worry about lifter coming out of bores too far and uncovering the oil band?
Yes, I measured this on mine. Many different lifter designs out there so that matters as well as the cam base circle. Based on the hyd flat tappet cam I had, discussed how much room I had to decrease the base circle with the cam grinder and how much room I had from there for lobe lift without uncovering the oil gallery. With an MP hemi block, unbushed, .430 intake lobe lift I'm only about .020 away on each end from uncovering the oil gallery. I’ll be at .412 lobe lift 🤞
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Re: 511 tf270 cam, header, Intake, gear selection?
[Re: Uberpube]
#2842813
11/07/20 12:50 AM
11/07/20 12:50 AM
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Joined: Aug 2006
Posts: 2,141 junction city oregon
viperblue72
OP
top fuel
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OP
top fuel
Joined: Aug 2006
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junction city oregon
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Are you planning on doing any chassis dyno pulls when you're done? Would like to compare when I get done. I do plan to put it on either an engine dyno or chassis dyno 👍
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Re: 511 tf270 cam, header, Intake, gear selection?
[Re: viperblue72]
#2842816
11/07/20 01:12 AM
11/07/20 01:12 AM
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Joined: May 2019
Posts: 713 Lake Villa Il
INTMD8
super stock
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super stock
Joined: May 2019
Posts: 713
Lake Villa Il
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Next question. Do I have to worry about lifter coming out of bores too far and uncovering the oil band?
Yes, I measured this on mine. Many different lifter designs out there so that matters as well as the cam base circle. Based on the hyd flat tappet cam I had, discussed how much room I had to decrease the base circle with the cam grinder and how much room I had from there for lobe lift without uncovering the oil gallery. With an MP hemi block, unbushed, .430 intake lobe lift I'm only about .020 away on each end from uncovering the oil gallery. I’ll be at .412 lobe lift 🤞 Still, need to measure everything due to variance in lifter design and base circle.
69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
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Re: 511 tf270 cam, header, Intake, gear selection?
[Re: mopar dave]
#2842924
11/07/20 10:52 AM
11/07/20 10:52 AM
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Joined: Sep 2007
Posts: 876 Arizona
PolyDart
super stock
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super stock
Joined: Sep 2007
Posts: 876
Arizona
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I just finished a 512 low deck stroker with 10.5:1, TF270s, deep ported Indy single plane, 2" headers, 1050 dominator, and a solid roller cam. It has yet to be on a dyno, but I can tell you that it's a beast in my 3200lb Dart. I'm running Caltracs and MT 295/65-15s and the car will light them up at will. Looking into Davis traction control so I can reliably put the power to the pavement.
Here is the cam card:
Last edited by ab7fh; 11/07/20 10:53 AM.
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Re: 511 tf270 cam, header, Intake, gear selection?
[Re: INTMD8]
#2842968
11/07/20 12:48 PM
11/07/20 12:48 PM
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Joined: Aug 2006
Posts: 2,141 junction city oregon
viperblue72
OP
top fuel
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OP
top fuel
Joined: Aug 2006
Posts: 2,141
junction city oregon
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Next question. Do I have to worry about lifter coming out of bores too far and uncovering the oil band?
Yes, I measured this on mine. Many different lifter designs out there so that matters as well as the cam base circle. Based on the hyd flat tappet cam I had, discussed how much room I had to decrease the base circle with the cam grinder and how much room I had from there for lobe lift without uncovering the oil gallery. With an MP hemi block, unbushed, .430 intake lobe lift I'm only about .020 away on each end from uncovering the oil gallery. I’ll be at .412 lobe lift 🤞 Still, need to measure everything due to variance in lifter design and base circle. I do realize that I need to measure. I should of been clear. Thank you for the advice.
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Re: 511 tf270 cam, header, Intake, gear selection?
[Re: PolyDart]
#2842971
11/07/20 12:49 PM
11/07/20 12:49 PM
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Joined: Aug 2006
Posts: 2,141 junction city oregon
viperblue72
OP
top fuel
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OP
top fuel
Joined: Aug 2006
Posts: 2,141
junction city oregon
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I just finished a 512 low deck stroker with 10.5:1, TF270s, deep ported Indy single plane, 2" headers, 1050 dominator, and a solid roller cam. It has yet to be on a dyno, but I can tell you that it's a beast in my 3200lb Dart. I'm running Caltracs and MT 295/65-15s and the car will light them up at will. Looking into Davis traction control so I can reliably put the power to the pavement.
Here is the cam card:
Very nice build. Is the times in your signature with this motor?
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Re: 511 tf270 cam, header, Intake, gear selection?
[Re: mopar dave]
#2842977
11/07/20 12:51 PM
11/07/20 12:51 PM
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Joined: Jan 2003
Posts: 31,061 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,061
Oregon
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My book shows 3.73 gear as being best starting line ratio with 4.25 stroke, 28' tire and 3400# for my car. 3.73 probably would be a good ratio with a 28 inch tire. I decided that 3.90 was the best ratio for my Duster but I have a 29.5 inch tire in it.
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Re: 511 tf270 cam, header, Intake, gear selection?
[Re: AndyF]
#2843090
11/07/20 03:59 PM
11/07/20 03:59 PM
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Joined: Aug 2006
Posts: 2,141 junction city oregon
viperblue72
OP
top fuel
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OP
top fuel
Joined: Aug 2006
Posts: 2,141
junction city oregon
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My book shows 3.73 gear as being best starting line ratio with 4.25 stroke, 28' tire and 3400# for my car. 3.73 probably would be a good ratio with a 28 inch tire. I decided that 3.90 was the best ratio for my Duster but I have a 29.5 inch tire in it. Andy I’m going to be changing to a 295/65 or a 29” tire. So 3.91 may be my best bet. 👍
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Re: 511 tf270 cam, header, Intake, gear selection?
[Re: viperblue72]
#2843095
11/07/20 04:13 PM
11/07/20 04:13 PM
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Joined: Jan 2003
Posts: 31,061 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,061
Oregon
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My book shows 3.73 gear as being best starting line ratio with 4.25 stroke, 28' tire and 3400# for my car. 3.73 probably would be a good ratio with a 28 inch tire. I decided that 3.90 was the best ratio for my Duster but I have a 29.5 inch tire in it. Andy I’m going to be changing to a 295/65 or a 29” tire. So 3.91 may be my best bet. 👍 You have a 8.75 rearend behind 700 hp?
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Re: 511 tf270 cam, header, Intake, gear selection?
[Re: viperblue72]
#2843096
11/07/20 04:14 PM
11/07/20 04:14 PM
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Joined: Jan 2003
Posts: 31,061 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,061
Oregon
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Where do I order a Indy 400-2 intake from? Can the valves use unshrouding on these heads? I have a friend that wants to do intake porting and optimizing. Don't touch the heads. The Indy intake can be purchased from most anyone.
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