FE Power Forums
FE Power Forums => FE Technical Forum => Topic started by: My427stang on September 23, 2019, 07:18:09 AM
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Doing a Trick Flow headed 461, and have a bunch of forum members involved in this one.
- Brent and I, as always, bench racing, comparing ideas and primary parts guy
- Joe Craine doing port work on a -F PI intake
- Wes recurved/restored a factory distributor
- Lots of parts from Doug Garifo as well
Snapped a couple pics yesterday, this is likely the first hyd roller TFS engine with Brent's rockers. This one will also be painted concours-correct with all Cobra Jet external components for a 68.5 ram air car. You can see we milled the Trick Flow logo off the front of the heads. They won't look exactly like stock heads, but enough to hide to the passer by when it's all painted blue. Going in a 3.91 geared 4 speed Mustang fastback
(http://i.postimg.cc/SRNmV5ds/59077293868-EB3-BEC70-4431-463-E-8-AC0-FEA9-D58-FED95.jpg)
Got a little different results from the .200 stand cut Brent usually sees. I ended up almost exactly at -.100 to get the rocker pattern correct and ended up with .620 at the valve with 155/390 valve spring pressure, versus .610 with checking springs the first time.
Here is a before shot, this setup uses a set of Doug's stands cut .200, with tins at .030
(http://i.postimg.cc/7Y9mpRV4/IMG-1521.jpg)
Here is an after shot, I made a one piece bar at .096 and took away the tins, would have liked to use them, but I just couldn't find material for a spacer that I liked. FWIW, the tins worked nicely with Doug's stands and the TFS heads, and the recessed head bolts make shimming things with a one piece rail easy. The end result of the combo would be the same as a .100 cut on Doug's stands, or a .070 cut with the tins.
(http://i.postimg.cc/brsw-pWt5/59086784007-4-A9-C6-A98-23-F7-40-B8-9-D15-CB6-BFC28-BA52.jpg)
Should be a fun build, very similar to the iron 461 I posted on the dyno page, but some neat differences.
- 1.0/1.0/2.0 ring combo versus 1.5/1.5/3.0
- Cam almost identical, but 2 degrees less intake lobe, but rocked back 2 degrees to 107
- Ported -F PI intake versus ported CJ intake
- Trick Flow heads versus iron CnC ported CJ, same valve sizes (peak flow on CJ heads were in the 320 cfm range, but thinking the medium riser port and modern port design will gain flow everywhere)
- Small 69 cc chamber with dish vice 83 cc CnC Craft ported iron chamber
- .041 vs .046 quench
- Canton windage tray versus Ford
- Much lighter rotating assembly with Molnar rods, bobweight ended up to be 111 grams less than the iron CJ, which was light already)
More to come, this one should be another healthy one with 16+ in Hg of vacuum and well over 500 hp with mid-grade pump gas
Might need to upgrade my 489 :)
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That will be the first one that I've seen that doesn't need a full .200" whack.
I have tried factory rockers, the new Comp rockers, and T&D on TFS heads. They all needed .200" cut off the stands. My rockers are made by Harland Sharp and use similar geometry, so there must be something inherent about the HS pieces that don't need as radical of a cut.
550 hp or bust on this one. :)
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Very nice, looking forward to seeing what it makes ;D
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Are we going to play “guess the horsepower” on this one?
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Brent - it indeed surprised me too, but maybe the HS does use a different dimension to get to the same place.
Raptor - It'd be fun to see the guesses, especially when able to compare it to the results on the iron build. Let me get a little further on it and I will post all the details, cam, carb, intake flow, etc. Likely best to get closer to dyno date and we can let the gang churn on it.
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It will be a hoss.
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Is the intake port entry in the TFS head shorter than a 427 MR head?
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Is the intake port entry in the TFS head shorter than a 427 MR head?
No, it is almost identical to a medium riser (Mr Gasket 202A) gasket in both location and size. Anyone who has seen the pictures asks that, not sure why they look that way, likely because rocker perches are .300 higher and continuous across the top of the head
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Cool! I can’t wait to see the outcome of this build. I gotta say those TFS heads are cool! They make some power. I’m not gonna try to guess this one LOL. Should be up there!
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On my 428 ended up only shaving a hundredth off the bases also but was unable to use the factory tins...
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I guess the FE Gods were smiling on me. Here is a pic of my TFS valve stems using Dove HD rocker assemblies. I did no shimming or trimming on mine.
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It is wild, valve stems and rocker pad should be constant, it all comes down to rocker and stand design
FWIW I measured pad height compared to an uncut C8 iron, TFS was +.300, and valves were +.100 (valves from memory) so it SHOULD be different, but it goes to show you that every combo needs to be checked, including iron heads. I gained .010 of lift getting it right but that doesn’t map the whole lift curve.