70 dart 470 ci drag car build.

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I went to work this morning & set up my cylinder head to check piston to valve clearance checked in just fine. Intake .110 & exhaust .130.
The springs set up at 1.930 without shims.
My pushrods are still correct length, but diameter will be 7/16 instead of 3/8.
 
Thanks trickflow for making such nice ports .
I'm roughing up/ removing the CNC step over.
I will cartridge roll these the hit the floor and bowls with a rougher burr finish.
IMG_20250318_100116768.jpg
 
mopowers said:
Great work! I'm jealous. I'd be so paranoid about touching the seat.
Click to expand...
Thanks, I myself am just following what trickflow already put in here so I can't take much credit.
I was very hesitant to put a burr in here lol, if I hit the seat I can just touch up the valve job here at work.
I am purposely getting as close as I comfortably can to my bottom cut for extra atomization.
 
Time to put you in the hot seat……
New roller cam, more head work, more intake work………

What’s the “make or break” number for it to be called a “success” in your mind?
 
PRH said:
Time to put you in the hot seat……
New roller cam, more head work, more intake work………

What’s the “make or break” number for it to be called a “success” in your mind?
Click to expand...

It’ll be PERFECT as soon as it splits the block.

Then we do it again lol
 
PRH said:
Time to put you in the hot seat……
New roller cam, more head work, more intake work………

What’s the “make or break” number for it to be called a “success” in your mind?
Click to expand...
Running 9.50s at my track would be just fine.
720s 730s for power is good in my book with factory block limitations
 
PRH said:
Okay, sooooo 700.1 is a win……and 699.9 is a fail………. And 700.0 is :BangHead:
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Lol, 699.9 will be slightly disappointing but I won't complain, can't complain since I did it lol.
What would you expect or be happy with if you built my engine?
 
I don’t have a good sense on how your intake mods may have affected the operating range.
The experiences I’ve had with them(RB version) is that they peak early.
If that trend continues, it will put a little hurtin on the “big number”.

Fundamentally I’d be expecting over 700 out of that combo, but I just wouldn’t have it in me to spend that much time on the manifold.
I hope the efforts pay off.

I was trying to recall if I’ve ever tested any std port engine that made it into the 700’s……. And I don’t think I have.
There have been a few in the 690 range.

But I do feel like it is something I could do now.
 
MOPARMAGA said:
Thanks trickflow for making such nice ports .
I'm roughing up/ removing the CNC step over.
I will cartridge roll these the hit the floor and bowls with a rougher burr finish.View attachment 1716380691
Click to expand...
Do you have a pic of an unmodified (by you) port for reference? I’d like to see the step over you’re talking about if available (or do you mean all the little the grooves the CNC machining leaves?)

Edit:
I googled stepover and learned a thing:)
 
PRH said:
I don’t have a good sense on how your intake mods may have affected the operating range.
The experiences I’ve had with them(RB version) is that they peak early.
If that trend continues, it will put a little hurtin on the “big number”.

Fundamentally I’d be expecting over 700 out of that combo, but I just wouldn’t have it in me to spend that much time on the manifold.
I hope the efforts pay off.

I was trying to recall if I’ve ever tested any std port engine that made it into the 700’s……. And I don’t think I have.
There have been a few in the 690 range.

But I do feel like it is something I could do now.
Click to expand...
Now I wish I would have measured these runners to compare volume. You had mentioned to me about the way these tunnel ram runners are with a shape in the plenum then transitions into the port shape.
I've basically brought that port shape into the transition & honestly I probably hurt performance the last time when attempted this the first time because I made it small-big-small
Now there's actual taper from the top.
I think it should be much better.
Best part is I'm learning & getting a little better with a grinder.
 
dusterbing the peace said:
Do you have a pic of an unmodified (by you) port for reference? I’d like to see the step over you’re talking about if available (or do you mean all the little the grooves the CNC machining leaves?)

Edit:
I googled stepover and learned a thing:)
Click to expand...
Yes, pictures coming. Also showing my hurried blend job from last time I messed it up lol
IMG_20250318_182701191.jpg
IMG_20250318_182715187.jpg
 
This isn't knife edging the proper way.
I almost forgot about it.
Not today razor blade....not today !
IMG_20250318_190434828.jpg
 
I remembered a std port BB combo I tested that made over 700hp.
From over 20 years ago…….
528 built with a Megablock, 14:1cr, B1-BS heads with basic port job(320/250), 280/280, .690/.690 roller, MP TR(not ported) with 2x750DP’s.
I don’t have any sheets for this one, but I’m remembering it as around 730hp, with it peaking around 6k.

In a 3700+lb 68 Charger it went a best of 9.71@140.
That was with ladder bars.
With Caltracs it went like 9.86@139.

We started out on the dyno with an M1 single plane and an 850DP(probably had a spacer too)…….I don’t remember the numbers exactly, but it was solidly under 700hp.

In my mind, nowadays the “easy button” for 700hp+ from a 470 would be the TF270’s and the Indy 4500 intake on a 12:1 short block.

If keeping with the std port theme, nicely ported Indy SR’s or Victors will out flow the TF240’s by enough to matter(of course, the TF’s could also be ported “more”).
Even with the std port opening heads I’d still run the Indy manifold, and live with the port mismatch.
The sr’s and victors can easily facilitate the MW opening, so I’m referring to the 240’s when I’m talking about the mismatch.
I’d get the 240 heads as close to MW as possible, then live with the mismatch.

For a “true” std port combo……single carb…..the TF or Victor intake with a bit of clean up work should get it over 700hp.

A Weiand or MP TR would pump up the peak numbers some, but will likely peak earlier.
 
Last edited:
PRH said:
I remembered a std port BB combo I tested that made over 700hp.
From over 20 years ago…….
528 built with a Megablock, 14:1cr, B1-BS heads with basic port job(320/250), 280/280, .690/.690 roller, MP TR(not ported) with 2x750DP’s.
I don’t have any sheets for this one, but I’m remembering it as around 730hp, with it peaking around 6k.

In a 3700+lb 68 Charger it went a best of 9.71@140.
That was with ladder bars.
With Caltracs it went like 9.86@139.

We started out on the dyno with an M1 single plane and an 850DP(probably had a spacer too)…….I don’t remember the numbers exactly, but it was solidly under 700hp.

In my mind, nowadays the “easy button” for 700hp+ from a 470 would be the TF270’s and the Indy 4500 intake on a 12:1 short block.

If keeping with the std port theme, nicely ported Indy SR’s or Victors will out flow the TF240’s by enough to matter(of course, the TF’s could also be ported “more”).
Even with the std port opening heads I’d still run the Indy manifold, and live with the port mismatch.
The sr’s and victors can easily facilitate the MW opening, so I’m referring to the 240’s when I’m talking about the mismatch.
I’d get the 240 heads as close to MW as possible, then live with the mismatch.

For a “true” std port combo……single carb…..the TF or Victor intake with a bit of clean up work should get it over 700hp.

A Weiand or MP TR would pump up the peak numbers some, but will likely peak earlier.
Click to expand...
Thanks for that info.
Im going to have to go back and see what Andy's best numbers were with the 240s.
Maybe some of his power came from the dry sump system.
THanks again!
 
He got over 700 pretty easily as I recall.
Might have taken a ported intake to get there, but he didn’t have a high CR either.
 
MOPARMAGA said:
Now I wish I would have measured these runners to compare volume. You had mentioned to me about the way these tunnel ram runners are with a shape in the plenum then transitions into the port shape.
I've basically brought that port shape into the transition & honestly I probably hurt performance the last time when attempted this the first time because I made it small-big-small
Now there's actual taper from the top.
I think it should be much better.
Best part is I'm learning & getting a little better with a grinder.
Click to expand...
So if you've 'corrected' the taper issues with that manifold the HP will go up. By the time you made that manifold look like it 'needs to' to be perfect, it won't look like the original manifold and it'll have about 50% of the original cast aluminum remaining FWIW. But there's still room on the table to grow with the M1tr likely in OTB form, I think I know of one. But too as I have said in the past and has been offered here, opening to a MW intake and the respective larger intake runner will increase the peak HP of course. I'd guess it'd loose some torq as well, not that this WILL slow the car down.
 
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