D/Dart in Stock

[Paul Ceasrine]

dat4forte,

The carburetor for the D-Dart was a Holley #4160 (List #3778)
Which means it had metering-plates only.
A single-feed with the short transfer tube, between the front and back float bowls.
It was a vacuum-only for the secondaries.
The butterly openings were 1 11/16" (Primary and Secondary).
Here's the confusion, what was the CFM-rating.
It was 700 CFM.
Holley serial #'s _776 = 600 CFM
_777 = 650 CFM
_778 = 700 CFM (D DART)
_779 = 750 CFM
_780 = 800 CFM

* The D DART carburetor was equipped with a manual choke only.
PC

[dart4forte]

Originally Posted by Paul Ceasrine

dat4forte,

The carburetor for the D-Dart was a Holley #4160 (List #3778)
Which means it had metering-plates only.
A single-feed with the short transfer tube, between the front and back float bowls.
It was a vacuum-only for the secondaries.
The butterly openings were 1 11/16" (Primary and Secondary).
Here's the confusion, what was the CFM-rating.
It was 700 CFM.
Holley serial #'s _776 = 600 CFM
_777 = 650 CFM
_778 = 700 CFM (D DART)
_779 = 750 CFM
_780 = 800 CFM

* The D DART carburetor was equipped with a manual choke only.
PC

So what you are saying is the last three numbers in the list number is the CFM rating? Also, I thought the spacer between the carb and the manifold was to allow full openings of the butterflys. If that's true then why did they need to bore out the manifold? I wonder how that motor would of responded to an Edelbrock D4B?

[Paul Ceasrine]

Yes,
The Holley List #'s for the #3775, #3776, etc. coincide with the higher
CFM ratings.
I mis-stated earlier that the D-Dart Holley carb was a 600-CFM rated unit. I was incorrect, as I didn't check my old data sheet.
It was a Holley 4160, with a 700 CFM rating.
Again, more mystery surrounding the D-Dart information.
Also, the carburetor wasn't just a bolt-on, from out-of-the box. It was tweaked at the factory ("Chrysler Performance Factory-Prepped").
Just what did that mean? (Next posting)
PC

[dart4forte]

Originally Posted by Paul Ceasrine

Yes,
The Holley List #'s for the #3775, #3776, etc. coincide with the higher
CFM ratings.
I mis-stated earlier that the D-Dart Holley carb was a 600-CFM rated unit. I was incorrect, as I didn't check my old data sheet.
It was a Holley 4160, with a 700 CFM rating.
Again, more mystery surrounding the D-Dart information.
Also, the carburetor wasn't just a bolt-on, from out-of-the box. It was tweaked at the factory ("Chrysler Performance Factory-Prepped").
Just what did that mean? (Next posting)
PC

Maybe tweeked by teams/driver that had sucess with their 273 combos

[Paul Ceasrine]

On the Edelbrock, aluminum dual-plane high-rise intake.
Now that MANIFOLD should have been part of the standard unit for the
D-Dart. Worked well in mid-range 3800 - 5800 RPM.
A nice way to bolt-on an additional 15HP.
Not too bad of price either ($100 back in 1971). Worked very well with
our 67' 273/235 Cuda convertible/automatic car (SS/NA in 72'/73').
Only draw-back, the Carter #4295A (500 CFM) was a little under-sized.
PC

[Paul Ceasrine]

To Akan Hvizdos (ddartdude),
Regarding Post #12.
Nothing on Ted Spehar/Ralph Costa.
But one thing perplexes me? What was Jon Rasbach doing in
H/SA in 1970. Now I think Lapeer Dragway didn't open until 1968.
To be classified in H/S (11.00 -11.49 wt/hp) that weight factor was
used by NHRA in 69'/70'/71' (3 straight years)
I'm wondering if the NHRA didn't re-rate the HP for the D-Dart to
265HP at that time, giving it an 11.11 stock class factor.
I remember back then, that the NHRA re-rated the 340/275HP to
290HP.
Now I don't think Lapeer was an AHRA sanctioned track. But
Detroit Dragway, where Ted Spehar ran was AHRA-sanctioned.
PC

[ddartdude]

Originally Posted by Paul Ceasrine

To Akan Hvizdos (ddartdude),
Regarding Post #12.
Nothing on Ted Spehar/Ralph Costa.
But one thing perplexes me? What was Jon Rasbach doing in
H/SA in 1970. Now I think Lapeer Dragway didn't open until 1968.
To be classified in H/S (11.00 -11.49 wt/hp) that weight factor was
used by NHRA in 69'/70'/71' (3 straight years)
I'm wondering if the NHRA didn't re-rate the HP for the D-Dart to
265HP at that time, giving it an 11.11 stock class factor.
I remember back then, that the NHRA re-rated the 340/275HP to
290HP.
Now I don't think Lapeer was an AHRA sanctioned track. But
Detroit Dragway, where Ted Spehar ran was AHRA-sanctioned.
PC

Paul,
sJust looked at the photo of Jon and the D/Dart and it had L/SA not H/SA on the windshield. Not sure what the weight factor of it would be. Jon did put on the photo, although it was done by computer, that it was taken at Lapeer during the summer of 1970. I talked to him briefly on night and he said he didn't know what it ran back then -- but in the one picture he sent to me, his wife is standing next to thecar holding a trophy.

Jon bought the car from Spehar in the Summer of 70 with the automatic already in it. He raced it a few times that summer and then sold it to Al Adam sometime in 1971. I bought it in 2002 from Al. At the time, it was at his mom's place in Reading,Pa. I think Al may have raced the car there at times.

Alan

[dart4forte]

Originally Posted by Paul Ceasrine

dat4forte,

The carburetor for the D-Dart was a Holley #4160 (List #3778)
Which means it had metering-plates only.
A single-feed with the short transfer tube, between the front and back float bowls.
It was a vacuum-only for the secondaries.
The butterly openings were 1 11/16" (Primary and Secondary).
Here's the confusion, what was the CFM-rating.
It was 700 CFM.
Holley serial #'s _776 = 600 CFM
_777 = 650 CFM
_778 = 700 CFM (D DART)
_779 = 750 CFM
_780 = 800 CFM

* The D DART carburetor was equipped with a manual choke only.
PC

Okay, food for thought. 1969 Chevy 427 and 1969 Chevy Z-28 with the 302 both had 4150 Holley carbs rated from the factory at 780 CFM. Example, the 427 carbs had a listing of #4346 for the COPOs and #4396 for the ZL1. So how does that fit with what you state above?

[Paul Ceasrine]

It doesn't.
What I was stating is that on Model 4160 carbs, with a List #3776
thru #3800, the CFM ratings start at 600 CFM, and ascend up to
800 CFM.
As for other Holley carbs, the List #'s are over the place.
Nothing symetrical.
For instance, the Holley 4160 carb for the 68' Race Hemi has a
List #4235 (Right side, 770 CFM carb)
List #4236 (Left side, 770 CFM carb)

I will not answer a Chevy question
PC

[dart4forte]

Originally Posted by Paul Ceasrine

It doesn't.
What I was stating is that on Model 4160 carbs, with a List #3776
thru #3800, the CFM ratings start at 600 CFM, and ascend up to
800 CFM.
As for other Holley carbs, the List #'s are over the place.
Nothing symetrical.
For instance, the Holley 4160 carb for the 68' Race Hemi has a
List #4235 (Right side, 770 CFM carb)
List #4236 (Left side, 770 CFM carb)

I will not answer a Chevy question
PC

I thought I'd slip that chivy question in