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AFR 528 vs. A429 514 Real World Results

11K views 19 replies 10 participants last post by  nickbay 
#1 · (Edited)
Thought you guys might be interested this. I ran a new AFR headed 528 this past weekend in the 1/2 mile event here in town. Same 2.75 gears I ran in the mile last year so I could have a good comparison (they give you 1/2 mile speeds when running the mile). Same carb without any jetting changes. Didn't make any changes to the car except the motor.

A429 headed 514:
4.150 stroke
6.800 rods
4.440 bore
11:1 compression
244/252 .608/.633 118LS solid flat tappet
A429's with bowl blending

Best 1/2 mile speed was 127, most runs were 123-124

---------------------------------------------------------------------------------------

AFR headed 528:
4.300 stroke
6.800 rods
4.420 bore
10.9:1 compression pistons with SCJ valve reliefs
224/234 .538/.562 112LS hyd flat tappet
AFR heads with 270cc intake runners and 75cc chambers

Best 1/2 mile speed was 130, most runs were 126-127

---------------------------------------------------------------------------------------

The AFR engine was built from an old D3 headed 429 that I built about 20 years ago. Reused block, cam, lifters, timing set, intake, and oil pump/pan. Just installed a new 528 stroker kit, and AFR heads.

For the AFR headed motor to run faster than that old A429 combination with 20 degrees less cam duration and .100 less lift is pretty impressive in my opinion. Bottom end power is vastly improved, but I wasn't able to take advantage of it with the 2.75 open diff. With my trac-loc 3.25's in the car, I expect it to run 135+ pretty consistently. I was crossing the stripe in the 1/2 at ~4500rpm with the 2.75's but did a few shifts at 6000, so I know it'll turn the RPM for it.

Here's a video running against a 69 GTO that had a 400 with a 5-speed and 4:11 gears.


:D
 
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#2 ·
Thought you guys might be interested this. I ran a new AFR headed 528 this past weekend in the 1/2 mile event here in town. Same 2.75 gears I ran in the mile last year so I could have a good comparison (they give you 1/2 mile speeds when running the mile). Same carb without any jetting changes. Didn't make any changes to the car except the motor.

A429 headed 514:
4.150 stroke
6.800 rods
4.440 bore
11:1 compression
244/252 .608/.633 118LS solid flat tappet
A429's with bowl blending

Best 1/2 mile speed was 127, most runs were 123-124

---------------------------------------------------------------------------------------

AFR headed 528:
4.300 stroke
6.800 rods
4.420 bore
10.9:1 compression pistons with SCJ valve reliefs
224/234 .538/.562 112LS hyd flat tappet
AFR heads with 270cc intake runners and 75cc chambers

Best 1/2 mile speed was 130, most runs were 126-127

---------------------------------------------------------------------------------------

The AFR engine was built from an old D3 headed 429 that I built about 20 years ago. Reused block, cam, lifters, timing set, intake, and oil pump/pan. Just installed a new 528 stroker kit, and AFR heads.

For the AFR headed motor to run faster than that old A429 combination with 20 degrees less cam duration and .100 less lift is pretty impressive in my opinion. Bottom end power is vastly improved, but I wasn't able to take advantage of it with the 2.75 open diff. With my trac-loc 3.25's in the car, I expect it to run 135+ pretty consistently. I was crossing the stripe in the 1/2 at ~4500rpm with the 2.75's but did a few shifts at 6000, so I know it'll turn the RPM for it.

Here's a video running against a 69 GTO that had a 400 with a 5-speed and 4:11 gears.
https://www.youtube.com/watch?v=bdAbzFBOneU&feature=youtu.be

:D


2 diff bore sizes,and 2 diff strokes, how is that info any good?
 
#3 ·
AFR headed combo bested the A429 headed combo with 20* less intake duration and less lift. That to me seems pretty damned relevant.

I get your point Rich but am looking at the bigger picture here.



S
 
#4 ·
Nice work Carl thanks for sharing!

I wonder how much more power there would be in a custom cam?

With 3.55 gears and 3000rpm stall this would be the ultimate street car!!

Afr's are the real deal.

Can't wait for the results in the "all out deal" Lem is doing with the 598ci afr build!!!

Cheers, Bob.
 
#5 ·
Not all out but...

11.7 to 1 557 pump gas deal (Forged crank rework of my LTD engine sold to capitalize recently purchased machine shop)
AFR 315's
Dommy 1050 / AFR intake
Custom Comp XM HR 258 / 270 @ .050" .660 net lift 111 lsa

795.7 hp @ 6,100 rpm 2" dyno headers
Over 800 with 2 1/4" dyno headers


I am waiting for those all out results as well. :D



S
 
#9 ·
not saying the AFR'S are a bad head,I like what I have seen.

Bolt the A429S on the 528 and make a run.
 
#12 ·
Yes, 118, installed 6 degrees advanced. I have a self imposed "vacuum rule" because the car has vacuum assist brakes, and I wanted the engine to pull to 6500+rpm, so that combination of duration and lobe separation is what it took to meet the goals. I also live at high elevation, and that plays a role as well.


.
 
#17 ·
This combo you've got sounds really close to what I'm getting in parts from you Carl, besides mine being a 548+/-. That GTO looked broken, haha. 400 with a 5 speed.....blah��

Mine will have a cast external crank though, will I be able to up the power later if I so desire with a bigger cam? Safely I guess is what I'm getting at....damn prolly shoulda went with the steel internal crank, I'm such a cheap bastard. I'm gonna call ya, might upgrade if it's not to late.

What stall are you using in this setup?
 
#18 ·
This combo you've got sounds really close to what I'm getting in parts from you Carl, besides mine being a 548+/-. That GTO looked broken, haha. 400 with a 5 speed.....blah��

Mine will have a cast external crank though, will I be able to up the power later if I so desire with a bigger cam? Safely I guess is what I'm getting at....damn prolly shoulda went with the steel internal crank, I'm such a cheap bastard. I'm gonna call ya, might upgrade if it's not to late.

What stall are you using in this setup?
It stalls at about 1800.

PM sent on the other stuff.


.
 
#19 ·
Finally getting a chance to post up the final results on the 2017 Colorado Mile.

No matter how you slice it, this AFR headed 528 is making more power than the A429 headed 514 despite going from a solid flat cam with 244/252 .608/.633 to a hyd flat with 224/234 .538/.562. I'll add photos of both the 2016, and the 2017 events for comparison purposes.



:D
 

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