Author Topic: 397ci Tunnel Port Dyno Mule Build  (Read 5356 times)

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blykins

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Re: 397ci Tunnel Port Dyno Mule Build
« Reply #30 on: July 22, 2022, 09:55:17 AM »
Block is here.





Brent Lykins
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Stangman

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Re: 397ci Tunnel Port Dyno Mule Build
« Reply #31 on: July 22, 2022, 08:14:28 PM »
looks clean. I thought you were using a 390 block. Never mind I went back. Is that a STD bore block.
« Last Edit: July 22, 2022, 08:18:50 PM by Stangman »

blykins

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Re: 397ci Tunnel Port Dyno Mule Build
« Reply #32 on: July 23, 2022, 05:58:22 AM »
I think it will end up a 4.250" bore size.
Brent Lykins
Lykins Motorsports
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JamesonRacing

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Re: 397ci Tunnel Port Dyno Mule Build
« Reply #33 on: July 23, 2022, 08:12:01 AM »
When I had TP heads, it seemed to be a big hurdle to get the exhaust to flow.  Recollection was that the TP exhaust port was a different and awkward shape compared to the MR ports.  After much massaging, we managed to get the flow with a 1.75" valve about equal to a mildly ported Ed head with 1.65" valves.

Is the exhaust flow not really a factor on the TP head performance?  Are there tricks to getting to port to flow well?  Do you significantly increase exhaust duration to compensate for the generous intake flow?

Thanks for giving this combo a go.  Should be an interesting build.
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blykins

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Re: 397ci Tunnel Port Dyno Mule Build
« Reply #34 on: July 23, 2022, 09:04:27 AM »
To be honest, I’ve not really focused that highly on trying to get the exhaust port up to modern numbers.  I make it up with the camshaft. 
Brent Lykins
Lykins Motorsports
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cammerfe

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Re: 397ci Tunnel Port Dyno Mule Build
« Reply #35 on: July 23, 2022, 10:21:32 PM »
The exhaust on the TPs referenced above were, for all practical purposes, duplicates of the MR lay-out. When I had Jim Dove make up the last pair we used in Brother Lon's Mustang, we used Jim's own design for the exhaust. The exhaust runners were raised, spread further apart, and reshaped. The entire exhaust part of the head was different to such a degree that they were not recognizable as FE.

We had to build completely custom headers to match. And, so as not to compromise the header design, we removed the spring towers completely and went to coil-overs out in the wheel wells. The mounts for the upper A-arms were lowered considerably and moved outboard. Tubular A-arms were much shorter. We also had to re-do the steering link.

KS

KS

mbrunson427

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Re: 397ci Tunnel Port Dyno Mule Build
« Reply #36 on: July 24, 2022, 09:57:59 AM »
I looked up our flow data on our drag car TP head. Intake flows 384, exhaust flows 221. That's with almost no intake port work and about a week of exhaust work.

Cammer, I think these are the heads you are describing? We had considered running these on our drag car, but like you mentioned, some shock tower work or removal was going to be needed to get them to work in the Mustang. Moving the exhaust around like that was a very solid idea by Dove, it's about the best you can do for the FE without twisting and canting the valves like a cleveland.






6667fan

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Re: 397ci Tunnel Port Dyno Mule Build
« Reply #37 on: July 24, 2022, 10:04:40 AM »
Brent, take a look at the rear bulkhead on that block. Likely will have a large raised P on it.
I have one here that was cast 15 days later. Also shopped a 6/15 block like you have there a few years back but did not land it.
How is the sonic map on it?
JB


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blykins

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Re: 397ci Tunnel Port Dyno Mule Build
« Reply #38 on: July 24, 2022, 01:17:16 PM »
I looked up our flow data on our drag car TP head. Intake flows 384, exhaust flows 221. That's with almost no intake port work and about a week of exhaust work.

That's a pretty good exhaust port for a TP head.  We get that intake flow, but it's with a much smaller CSA than factory.  Makes the heads a lot more responsive on street engines, especially smaller displacement engines. 

When I say "we", it's my head guy.  You don't want me within 6' of a die grinder.  Never been that artistic.
Brent Lykins
Lykins Motorsports
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cammerfe

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Re: 397ci Tunnel Port Dyno Mule Build
« Reply #39 on: July 24, 2022, 09:59:04 PM »
I looked up our flow data on our drag car TP head. Intake flows 384, exhaust flows 221. That's with almost no intake port work and about a week of exhaust work.

Cammer, I think these are the heads you are describing? We had considered running these on our drag car, but like you mentioned, some shock tower work or removal was going to be needed to get them to work in the Mustang. Moving the exhaust around like that was a very solid idea by Dove, it's about the best you can do for the FE without twisting and canting the valves like a cleveland.







Yes, very much the same changes. With the deck surface on the bench, a piece of rolled-up paper inserted into the exhaust runner sticks up very obviously. We were able to build headers with a straight extension at least six inches long before it was at all necessary for the primary tubes to begin to turn. It was common for observers to ask, "What kind of engine is that."

Lon ultimately sold the car. I understand it's in New Zealand now.

KS

blykins

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Re: 397ci Tunnel Port Dyno Mule Build
« Reply #40 on: August 28, 2022, 02:45:56 PM »
Rods came in.   I'll be deviating a hair from the original scope of the build.  Stroke will stay the same, but we will be using a new crankshaft featuring one of the Honda rod bearing sizes. 

Rods are custom R&R aluminum rods.  They are 7.250" long, but only weigh 600g.  As a comparison, the 6.700" K1 rods shown below have a 745g total weight.  With the smaller bearing diameter, the big end size is much smaller, even when compared to a K1/Molnar sized rod big end.





« Last Edit: August 28, 2022, 02:47:29 PM by blykins »
Brent Lykins
Lykins Motorsports
Custom FE Street, Drag Race, Road Race, and Pulling Truck Engines
Custom Roller & Flat Tappet Camshafts
www.lykinsmotorsports.com
brent@lykinsmotorsports.com
www.customfordcams.com
502-759-1431
Instagram:  brentlykinsmotorsports
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1968galaxie

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Re: 397ci Tunnel Port Dyno Mule Build
« Reply #41 on: August 29, 2022, 08:29:57 AM »
Looking  good!
Will be nice to see above superstock power levels from an FE.
Perhaps well over 2 HP/Ci inch.


blykins

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Re: 397ci Tunnel Port Dyno Mule Build
« Reply #42 on: August 29, 2022, 09:26:16 AM »
Looking  good!
Will be nice to see above superstock power levels from an FE.
Perhaps well over 2 HP/Ci inch.

Not a chance. 
Brent Lykins
Lykins Motorsports
Custom FE Street, Drag Race, Road Race, and Pulling Truck Engines
Custom Roller & Flat Tappet Camshafts
www.lykinsmotorsports.com
brent@lykinsmotorsports.com
www.customfordcams.com
502-759-1431
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mbrunson427

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Re: 397ci Tunnel Port Dyno Mule Build
« Reply #43 on: August 29, 2022, 10:28:42 AM »
Looking forward to it Brent

1968galaxie

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Re: 397ci Tunnel Port Dyno Mule Build
« Reply #44 on: August 29, 2022, 10:46:35 AM »
Not a chance.

Is this a pump gas small cam build? I am sorry if I read more into this.
I assumed with a 380 CFM head, short stroke, aluminum rods for high rpm that one would
easily reach 2+ HP per CFM.

Anyhow, doesn't matter - it looks like a very fun project!
Thank you for showing.