Re: Trick Flow heads
[Re: DLewis]
#2136952
08/19/16 11:54 PM
08/19/16 11:54 PM
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6_pack_runner
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6_pack_runner
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We went to Dyno today. 511 flat tap solid cam, M1 intake, Holley 950 XP, Hughes 1.5 rockers, 2" exhaust.
Nice....Did you end up going with a Low Deck or did you keep the 75 440 block ? Care to share a full rundown of your engine/parts ? Thanks
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Re: Trick Flow heads
[Re: AndyF]
#2137715
08/21/16 09:57 AM
08/21/16 09:57 AM
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Joined: Jan 2003
Posts: 75,082 U.S.S.A.
JohnRR
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The Harland rockers lose a little bit of lift with the stiffer K-950 springs. I think they were .750 with the Trick Flow springs but now are down to 0.738 lift. Is this a hyd. lifter cam ?
running up my post count some more .
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Re: Trick Flow heads
[Re: JohnRR]
#2137779
08/21/16 11:57 AM
08/21/16 11:57 AM
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6_pack_runner
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6_pack_runner
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The Harland rockers lose a little bit of lift with the stiffer K-950 springs. I think they were .750 with the Trick Flow springs but now are down to 0.738 lift. Is this a hyd. lifter cam ? Are you serious...A .750 lift Hydraulic cam
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Re: Trick Flow heads
[Re: JohnRR]
#2137856
08/21/16 01:30 PM
08/21/16 01:30 PM
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Joined: Jan 2003
Posts: 31,061 Oregon
AndyF
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The Harland rockers lose a little bit of lift with the stiffer K-950 springs. I think they were .750 with the Trick Flow springs but now are down to 0.738 lift. Is this a hyd. lifter cam ? Solid roller cam
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Re: Trick Flow heads
[Re: fast68plymouth]
#2137954
08/21/16 03:39 PM
08/21/16 03:39 PM
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Joined: Jan 2003
Posts: 14,513 So. Burlington, Vt.
fast68plymouth
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We went to Dyno today. 511 flat tap solid cam, M1 intake, Holley 950 XP, Hughes 1.5 rockers, 2" exhaust. What compression ratio, and what fuel did you run?
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Trick Flow heads
[Re: fast68plymouth]
#2138570
08/22/16 02:08 PM
08/22/16 02:08 PM
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Joined: Jan 2003
Posts: 14,513 So. Burlington, Vt.
fast68plymouth
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I have another set of TF heads in the shop now. This set has the 1.550 flat tappet springs and steel retainers.
The spring pressures don't really coincide with the spec sheet that comes with the heads. The spec sheet shows these heads to come with TFS -16094 springs, and that they have 138lbs at 1.950/430lbs at 1.250, with a 420lb/in rate. The TF dual spring spec chart on line shows different specs than that, and are closer to what I observed. TF claims these are PAC springs, and the specs are the same as a PAC 1294, so that's likely what they are. The specs for that spring are 175lbs at 1.900/442 at 1.275, 428lbs/in.
I have 2 calibration springs for my tester, and according to both I am within 2lbs of those springs.
The springs that come on these heads start to have some coil to coil contact at about 1.300, so at heights shorter than that the rate starts to climb pretty quickly. The coil bind height is listed at 1.190, and while some would get that low, several wouldn't and were solid at about 1.220-1.230.
My observed pressures at various heights for all 16 pieces are;
145-150 @ 1.980 160-165 @ 1.950 185-190 @ 1.900
390-395 @ 1.400 420-425 @ 1.350 455-465 @ 1.300 465-480 @ 1.275 480-500 @ 1.250
My suggestion for someone using this version head/spring...... Especially if you're planning on running a flat tappet cam and using most of the available lift from the spring is to verify the installed heights and pressures.
This set of heads had the installed heights between 1.945 and 1.960.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Trick Flow heads
[Re: fast68plymouth]
#2138685
08/22/16 04:27 PM
08/22/16 04:27 PM
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Joined: Jan 2003
Posts: 14,513 So. Burlington, Vt.
fast68plymouth
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I checked the guide clearances as well. 6 of the exhaust valve stems were .3413-.3415, the other two were .3411. The intake stems were all .3410-.3411. The guides were basically all the same, and had about .0006-.0008 clearance on the intakes, but those larger diameter exhaust stems were pretty snug(for my liking anyway) at .0004-.0005. The valve stems on these heads are polished to a very smooth finish, and the reamed finish of the guides are also very smooth, and my guess is with those ultra-smooth finishes you can get away with tighter clearances. However, I went with what I've had success with for over 20 years and set the intakes up at .0011-.0012, and the exhaust at .0014-.0015.
I'll reassemble the heads with the springs at 1.980 for a nominal 150lbs on the seat, and with the cam that will be used with these heads will be around 390lbs open. These are going on a 493 street cruiser, and that will be more than enough pressure. I'll assemble the heads with the inners removed for cam break in.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Trick Flow heads
[Re: AndyF]
#2138823
08/22/16 07:41 PM
08/22/16 07:41 PM
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Joined: Mar 2009
Posts: 2,469 Sydney,Australia
tex013
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Those seem a little on the high side for a flat tappet. Good thing you checked them over. Andy , if you are concerned with the pressure how do you feel about Hughes requiring 155/415 spring pressures ? I am running 130 seat with my Iskys (8305?) at the moment . And am looking at 135-140 for my new motor. Solid FT cams Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: Trick Flow heads
[Re: tex013]
#2138872
08/22/16 08:37 PM
08/22/16 08:37 PM
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Joined: Jan 2004
Posts: 13,247 Mt. Vernon, Ohio
dartman366
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Dwayne@Andy,After getting my TF heads I realized I had ordered the wrong springs for a roller cam, came with flat tappet springs, so I needed to change the springs, so I elected to go with the PAC 1225 dual spring which is 250# on the seat @ 2.00 but will be installed at 1.950 which will increase the seat pressure to 282# and open pressure will be 726# with the .690 cam plugged into Pac's calculator,,do you see any issues going this route? also thanks for the guide info as I will have Doug check and/or correct the guide clearance since they seem a little tight to me also, any suggestions are welcomed.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Trick Flow heads
[Re: fast68plymouth]
#2139016
08/22/16 11:51 PM
08/22/16 11:51 PM
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Posts: 14,513 So. Burlington, Vt.
fast68plymouth
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My advice is to check the actual pressures for the new springs and set the installed height accordingly.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Trick Flow heads
[Re: AndyF]
#2141245
08/26/16 12:37 PM
08/26/16 12:37 PM
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Joined: Jan 2003
Posts: 75,082 U.S.S.A.
JohnRR
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The Harland rockers lose a little bit of lift with the stiffer K-950 springs. I think they were .750 with the Trick Flow springs but now are down to 0.738 lift. Is this a hyd. lifter cam ? Solid roller cam Are the rockers deflecting to cause the loss of lift with the stiffer spring?
running up my post count some more .
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Re: Trick Flow heads
[Re: AndyF]
#2141333
08/26/16 03:23 PM
08/26/16 03:23 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
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Sure it's not the shafts............
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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