421 Stroker with Trick Flow Heads/Intake Dyno - Redux

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Just send it! I have a 410 stroker with trickflow heads, about 11.1 comp 800avs carb and my cam is 238/242 @ 50 thou with about 600 lift on a 112 lobe center. I have not had it on an engine dyno but on the chassis dyno it makes 425 hp @ 6000 rpm and 550 ft lbs torque @ 4750 rpm. At a guess I think this is well over 500 hp at the crank about 530hp. It is in an Australian 1974 Valiant Charger, weighs about 3000 lbs and has a TKO 5 speed manual box in it with 3.91 diff ratio. As I am 67 years old I do not like to drive a lumpy pig but its street manners are excellent and it will wheelspin all the way through second gear and if the road is a bit dusty you have to be careful in third.
 
WOOOO! HOOOOO!

Narrow center line / big over lap cams do kind of suck with clutches. It takes practice getting the car rolling nice and easy. At the race, different story. Kind of a dump and hammer it. (Not exactly really, but you all get the point.)

James Clews said:
Just send it! I have a 410 stroker with trickflow heads, about 11.1 comp 800avs carb and my cam is 238/242 @ 50 thou with about 600 lift on a 112 lobe center. I have not had it on an engine dyno but on the chassis dyno it makes 425 hp @ 6000 rpm and 550 ft lbs torque @ 4750 rpm. At a guess I think this is well over 500 hp at the crank about 530hp. It is in an Australian 1974 Valiant Charger, weighs about 3000 lbs and has a TKO 5 speed manual box in it with 3.91 diff ratio. As I am 67 years old I do not like to drive a lumpy pig but its street manners are excellent and it will wheelspin all the way through second gear and if the road is a bit dusty you have to be careful in third.
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rumblefish360 said:
WOOOO! HOOOOO!

Narrow center line / big over lap cams do kind of suck with clutches. It takes practice getting the car rolling nice and easy. At the race, different story. Kind of a dump and hammer it. (Not exactly really, but you all get the point.)
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I run a 246/250 @ .050 on a 108 and my 4sp Swinger with 3.55s is pretty easy to drive . The 4.0 stroke really does eat up some cam .
 
I’ve not run a stroker. Lumpiest was a MP circle track 288/.499-106 in a 10-1 iron headed 360/4spd/4.10’s on 28”’s.
 
“It idled like a lumberjack on crack” though the small 330 AVS didn’t help it much! LMAO!
Under power, It was good!
 
The results are in! Best pull made 551tq @ 4200 and 528hp @ 5600. We made a few additional pulls to 6000 rpms and it leveled off until 6300. Got to 531hp, but you could hear her laboring to get there.

Learned a lot today. First, the 190 intake volume on these heads has its limitations and is good for 360-410 displacement. Any more cubes and the heads simply run out of air. The tradeoff is I got gobs of torque down low with the longer stroke. Considering this motor is going into a street car, I'm okay with these results. I wanted 530hp and I got 528. Not bad. Not earth shattering either. I'm sure with some porting, it could make bigger numbers, but I'm not chasing it with this motor. A set of worked Indy heads or W heads will absolutely perform better on a larger displacement motor. End of story. These heads are intended for the guy that wants better-than-average flowing heads out of the box on a stroker less than 416ci.

Overall, I really like these heads and the intake. The fit and finish is excellent and what you'd expect from TrickFlow. As long as you have reasonable expectations, I'd highly recommend them.

 
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Was there a reason they didn’t use the air turbine or run the fuel through the fuel flow meters?

Would have been nice to see the air flow, fuel flow, and bsfc.
 
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I think if you want more...just up the @.050 8-10 degrees.
It's a success for the small cam used.
I do believe there is a 560hp 540 tq combo out there...and it's right nextdoor to this build.
 
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MOPAROFFICIAL said:
I think if you want more...just up the @.050 8-10 degrees.
It's a success for the small cam used.
I do believe there is a 560hp 540 tq combo out there...and it's right nextdoor to this build.
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or even 20 more degrees.
I ran a 260@50 cam on my stock stroke 360 street strip car.
Swapped it into my current 418. IMO on 418 inches to me 260@50 is marginal, and leaning more street than strip.
What he has there could handle lots more camshaft and still be streetable while being more potent at the track.
That all said, it makes good dyno power as is. Be curious to see it go down the track and hang some numbers on a scoreboard. Should run well into the 10’s
 
B3422w5 said:
or even 20 more degrees.
I ran a 260@50 cam on my stock stroke 360 street strip car.
Swapped it into my current 418. IMO on 418 inches to me 260@50 is marginal, and leaning more street than strip.
What he has there could handle lots more camshaft and still be streetable while being more potent at the track.
That all said, it makes good dyno power as is. Be curious to see it go down the track and hang some numbers on a scoreboard. Should run well into the 10’s
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For sure. I got exactly what I wanted out of this motor NA. It's going to have a 150hp kit on it which we'll be tuning on the chassis dyno once it's all together. That'll put me at almost 700hp and over 700tq on a car that weighs 2800lbs. More than enough for the street.

The KB Wedge that's in my avatar is being machined now. That's my Happy Dance motor :D



 
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Just Send It said:
For sure. I got exactly what I wanted out of this motor NA. It's going to have a 150hp kit on it which we'll be tuning on the chassis dyno once it's all together. That'll put me at almost 700hp and over 700tq on a car that weighs 2800lbs. More than enough for the street.

The KB Wedge that's in my avatar is being machined now. That's my Happy Dance motor :D
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heck yea….even figure an honest 650 horse with the spray, should run mid 9’s at worst if it sticks at that weight, probably even quicker than that.
I went 9.80’s at 3350 pounds with 650 horse.
Thing should be a scampering Scamp!!!
 
B3422w5 said:
or even 20 more degrees.
I ran a 260@50 cam on my stock stroke 360 street strip car.
Swapped it into my current 418. IMO on 418 inches to me 260@50 is marginal, and leaning more street than strip.
What he has there could handle lots more camshaft and still be streetable while being more potent at the track.
That all said, it makes good dyno power as is. Be curious to see it go down the track and hang some numbers on a scoreboard. Should run well into the 10’s
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Absolutely. Street strip or dual purpose are my favorite builds and central to most of what I do. The hp/tq figure/goal I pointed to is very indicative of that direction with na stuff. Imo It can become teeter tottery beyond a power level.
550+hp in a 3000lb a body is a rocket ship.
Even 250'[email protected] is very tame for this cid. Imo
 
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