Only 460hp

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srduster340

srduster340

FABO Gold Member
FABO Gold Member
Joined
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Location
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I'm hoping some of you more experienced guys can give me some answers. Here's my combo:
414 stroker
850 Holley DP
Eddy AG port matched, center divider modified
Ported Mopar iron heads #P4876179 275@650 (advertised)
1.6 rockers
Comp 242/[email protected]
.558/.573 after lash
Valve timing
Open
@.50 Int:15 BTDC
Exh:51 BBDC
Valve timing
Close
@.050 INT :47 ABDC
EHX:19 ATDC




106 Intake Centerline
106 LSA
KB356.060 Step Dish pistons +23.5 volume (Yeah, I know.)
9.4 Comp.
1.465 comp. height
Eagle SIR rods
Mopar cast crank
Internally balanced
TTI 1 5/8-1 3/4 Step headers
MSD Ignition @34 degrees
Engine made 460@5300
511ft;lbs@3900
Volumetric Efficiency reached 100% at 3900 and stayed till 4900.
Peaked at 102.9@4600
My question is, why did it peak at only 5300 and not pull higher?
According to the info about the heads, the work was concentrated in the "bowl" area.
Flow was supposedly up 44% on the intake over standard 360 heads.
I never had then flowed.
I assumed I had enough cfm for more power but I know that's not the whole story.
I guess the intake ports weren't opened up
Do I need more port volume/ cross sectional area.
I assume the port volume if standard 170-176cc.
Heads were purchased years before the engine was assembled.
My plan is to replace the pistons with flat tops.
Replace the rods with Scat 4340 I beams, ARP2000 bolt material.
Replace the heads?
Any thoughts on the cam?
Those Trick Flows looking good but not if I don't really "need" them.
How do I get 500+ hp?
For the record, I did not build the engine.
This is a street car with 3.55 gears, manual transmission. Not after maximum high rpm power.
Any input will be appreciated.
 
Last edited:
Many of the members here are more experienced than I am, however, with 9.4 to 1 cr, I don't see what is wrong with 460 hp and 511 ft lbs from your combination. A higher cr will help you find more hp, but what you already have is pretty solid IMHO.
 
missing linc said:
Many of the members here are more experienced than I am, however, with 9.4 to 1 cr, I don't see what is wrong with 460 hp and 511 ft lbs from your combination. A higher cr will help you find more hp, but what you already have is pretty solid IMHO.
Click to expand...
For the heads and cam he has, that's what I was thinkin too. Pretty dang stout.
 
srduster340 said:
I'm hoping some of you more experienced guys can give me some answers. Here's my combo:
414 stroker
850 Holley DP
Eddy AG port matched, center divider modified
Ported Mopar iron heads #P4876179 275@650 (advertised)
1.6 rockers
Comp 242/[email protected]
.558/.573 after lash
Valve timing
Open
@.50 Int:15 BTDC
Exh:51 BBDC
Valve timing
Close
@.050 INT :47 ABDC
EHX:19 ATDC




106 Intake Centerline
106 LSA
KB356.060 Step Dish pistons +23.5 volume (Yeah, I know.)
9.4 Comp.
1.465 comp. height
Eagle SIR rods
Mopar cast crank
Internally balanced
TTI 1 5/8-1 3/4 Step headers
MSD Ignition @34 degrees
Engine made 460@5300
511ft;lbs@3900
Volumetric Efficiency reached 100% at 3900 and stayed till 4900.
Peaked at 102.9@4600
My question is, why did it peak at only 5300 and not pull higher?
According to the info about the heads, the work was concentrated in the "bowl" area.
Flow was supposedly up 44% on the intake over standard 360 heads.
I never had then flowed.
I assumed I had enough cfm for more power but I know that's not the whole story.
I guess the intake ports weren't opened up
Do I need more port volume/ cross sectional area.
I assume the port volume if standard 170-176cc.
Heads were purchased years before the engine was assembled.
My plan is to replace the pistons with flat tops.
Replace the rods with Scat 4340 I beams, ARP2000 bolt material.
Replace the heads?
Any thoughts on the cam?
Those Trick Flows looking good but not if I don't really "need" them.
How do I get 500+ hp?
For the record, I did not build the engine.
This is a street car with 3.55 gears, manual transmission. Not after maximum high rpm power.
Any input will be appreciated.
Click to expand...

The VE numbers tell you exactly what the issue is. And the answer depends on who you ask.
 
missing linc said:
Many of the members here are more experienced than I am, however, with 9.4 to 1 cr, I don't see what is wrong with 460 hp and 511 ft lbs from your combination. A higher cr will help you find more hp, but what you already have is pretty solid
Click to expand...

missing linc said:
Many of the members here are more experienced than I am, however, with 9.4 to 1 cr, I don't see what is wrong with 460 hp and 511 ft lbs from your combination. A higher cr will help you find more hp, but what you already have is pretty solid
Click to expand...
 
Don't get me wrong, I'm happy with the performance. Pulls hard through the gears. I was building a cheap stroker when I acquired the rotating assembly. It was all under 1K. Just want to improve it now that more funds are available.
 
missing linc said:
Many of the members here are more experienced than I am, however, with 9.4 to 1 cr, I don't see what is wrong with 460 hp and 511 ft lbs from your combination. A higher cr will help you find more hp, but what you already have is pretty solid IMHO.
Click to expand...
Yep, and should be fun with a 4 spd!
 
srduster340 said:
I'm hoping some of you more experienced guys can give me some answers. Here's my combo:
414 stroker
850 Holley DP
Eddy AG port matched, center divider modified
Ported Mopar iron heads #P4876179 275@650 (advertised)
1.6 rockers
Comp 242/[email protected]
.558/.573 after lash
Valve timing
Open
@.50 Int:15 BTDC
Exh:51 BBDC
Valve timing
Close
@.050 INT :47 ABDC
EHX:19 ATDC




106 Intake Centerline
106 LSA
KB356.060 Step Dish pistons +23.5 volume (Yeah, I know.)
9.4 Comp.
1.465 comp. height
Eagle SIR rods
Mopar cast crank
Internally balanced
TTI 1 5/8-1 3/4 Step headers
MSD Ignition @34 degrees
Engine made 460@5300
511ft;lbs@3900
Volumetric Efficiency reached 100% at 3900 and stayed till 4900.
Peaked at 102.9@4600
My question is, why did it peak at only 5300 and not pull higher?
According to the info about the heads, the work was concentrated in the "bowl" area.
Flow was supposedly up 44% on the intake over standard 360 heads.
I never had then flowed.
I assumed I had enough cfm for more power but I know that's not the whole story.
I guess the intake ports weren't opened up
Do I need more port volume/ cross sectional area.
I assume the port volume if standard 170-176cc.
Heads were purchased years before the engine was assembled.
My plan is to replace the pistons with flat tops.
Replace the rods with Scat 4340 I beams, ARP2000 bolt material.
Replace the heads?
Any thoughts on the cam?
Those Trick Flows looking good but not if I don't really "need" them.
How do I get 500+ hp?
For the record, I did not build the engine.
This is a street car with 3.55 gears, manual transmission. Not after maximum high rpm power.
Any input will be appreciated.
Click to expand...
Looks like a solid reliable build, me personally I do not think your HP is out of line at all. If it is simply a daily driver do you need more HP? I would say run it till it breaks then chase more HP!
 
460 sounds alright. Its what I estimated my 408 put out with a milder cam. It had stock Eddy heads, 10.5:1 compression and a 230 degree Hughes hydraulic roller cam (around 0.500 lift) with 1.5 rockers but I could be out to lunch on that estimate. To me the compression is low for the cam and heads perhaps (what exactly do you have?) What do I know?
 
thats a great street motor
leave it as is
you want 50 more hp put 150 shot of spray on it you wont need it plenty of cool factor
you can play with this calc for the ball park

The Free & Accurate Horsepower Calculator

Use this horsepower calculator to calculate peak engine horsepower and peak power RPM.
www.gofastmath.com
 
7.9 i guessed based on comp ratio and and intake duration
 
I find it kinda sad when someone puts together a new combo and hits the dyno and ends up dejected with the results. See it here often. Then they immediately start thinking about changing out internals, never seeing what they’ve got after some time working on it.

I’d leave it as is, take it to the track and work on launches, hooking and shift points. See what you’ve got there as a package. The ability to put down good numbers at the track is more impressive than some arbitrary horsepower number IMO. 460, 500 hp on the street means nothing other than a number to throw out to impress.
But as it is the CR is kinda low, you could step up a bit on cam, intake, rear gear.
But you have the combo, you say you’re happy with it so work with it for the coming year, see whatcha got on the street and track
Then later maybe go with a 4.10 swap, try a nicely ported single plane intake.
You can always change those internals later as well.
 
srduster340 said:
I'm hoping some of you more experienced guys can give me some answers. Here's my combo:
414 stroker
850 Holley DP
Eddy AG port matched, center divider modified
Ported Mopar iron heads #P4876179 275@650 (advertised)
1.6 rockers
Comp 242/[email protected]
.558/.573 after lash
Valve timing
Open
@.50 Int:15 BTDC
Exh:51 BBDC
Valve timing
Close
@.050 INT :47 ABDC
EHX:19 ATDC




106 Intake Centerline
106 LSA
KB356.060 Step Dish pistons +23.5 volume (Yeah, I know.)
9.4 Comp.
1.465 comp. height
Eagle SIR rods
Mopar cast crank
Internally balanced
TTI 1 5/8-1 3/4 Step headers
MSD Ignition @34 degrees
Engine made 460@5300
511ft;lbs@3900
Volumetric Efficiency reached 100% at 3900 and stayed till 4900.
Peaked at 102.9@4600
My question is, why did it peak at only 5300 and not pull higher?
According to the info about the heads, the work was concentrated in the "bowl" area.
Flow was supposedly up 44% on the intake over standard 360 heads.
I never had then flowed.
I assumed I had enough cfm for more power but I know that's not the whole story.
I guess the intake ports weren't opened up
Do I need more port volume/ cross sectional area.
I assume the port volume if standard 170-176cc.
Heads were purchased years before the engine was assembled.
My plan is to replace the pistons with flat tops.
Replace the rods with Scat 4340 I beams, ARP2000 bolt material.
Replace the heads?
Any thoughts on the cam?
Those Trick Flows looking good but not if I don't really "need" them.
How do I get 500+ hp?
For the record, I did not build the engine.
This is a street car with 3.55 gears, manual transmission. Not after maximum high rpm power.
Any input will be appreciated.
Click to expand...

Have the heads ported more, mill them down some for 10.2:1...should be 500HP.
 
This isn’t a recommendation to change anything, but are just thoughts on “why” it makes what it makes.

Did you have the heads flowed, or is that an advertised number?
If it’s the advertised number...... it’s probably optimistic.

CR isn’t as high as it could be, especially if it had been built with quench.

Cam duration is fairly short for a combo that has smallish heads(for the displacement).
Those 4” crank combos can easily use up a short cam.

You should post up the sheet.

I agree with Brian........probably the easiest way to 500+ is mill the heads, more duration, and maybe a Victor intake.
 
Last edited:
A full weight duster with a good tune up of the suspension is 11's with a good converter. Me personally, I don't think your that far off except for it nosing over at 5300 but that's not a deal breaker. In the spirit of how I have dealt with a less than stellar HP number it's compression test, leak down the cylinders, vacuum check, and timing. If all that checks out then you can atleast know something is not a miss....

As said, a nice 150 nitrous hit would make your combo a 10 second ride no questions asked....

JW
 
a-bodyguy said:
12many said:
I find it kinda sad when someone puts together a new combo and hits the dyno and ends up dejected with the results. See it here often. Then they immediately start thinking about changing out internals, never seeing what they’ve got after some time working on it.

I’d leave it as is, take it to the track and work on launches, hooking and shift points. See what you’ve got there as a package. The ability to put down good numbers at the track is more impressive than some arbitrary horsepower number IMO. 460, 500 hp on the street means nothing other than a number to throw out to impress.
But as it is the CR is kinda low, you could step up a bit on cam, intake, rear gear.
But you have the combo, you say you’re happy with it so work with it for the coming year, see whatcha got on the street and track
Then later maybe go with a 4.10 swap, try a nicely ported single plane intake.
You
Click to expand...
Click to expand...

RustyRatRod said:
More compression and a solid roller.
Click to expand...
More compression is definitely in the plans. How much more cam do I need? I've read that strokers eat duration. Right now I'm at 242/250. Do I need 248/254 or 250/256?
 
For chasing ET........Cam, converter, intake, gears.........all need to be on the same page.

For a car that will see a lot of street use....... all of the above is a compromise.

For comparison:
410”, 10:1, 251/259-108 SR cam, .600/.600
Cleaned up RPM heads, Victor with plenum clean up and port matched, QFT 850.
504tq@4000
524tq@4700

504hp@5200
531hp@5600
538hp@5900
531hp@6400
 
Last edited:
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