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The three lobe .800" 280* cam might be a dead give away...:cool:
Yes true. Reminds me of a beautiful green 69 Chevelle SS396 Toronto streetracer back in the early 90's. Car looked like a nice clean stocker with rallys, till it started.

Still nice results
 

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Personal engine for my street car. Going to be EFI and TB. Dyno'd with a carb.

Needs a bigger carb, left power on the table but just wanted some break in runs, switch to EFI, and chassis dyno tune.

[email protected] [email protected] 500hp from 5300-up. Needs a bigger carb.

4.165 x 3.48
VFactor v2.35 ProFiler 205cc CNC
Ferrea 2.08/1.600 LS Valves
KMotion K800 springs
LGM rockers
Motown EFI Ported manifold
Scat LW crankshaft
Scat LW 6.00 rods
Mahle 1/1/2mm pistons
10.5-1
TPiS/Howards Billet solid roller
231/235 112 LSA 108 ICL
.580 lift
3/8 pushrods
Morel full time oiling lifters
SA Billet chain
cast aluminum chain cover w/roller bearing
BBK billet pullies
Tuff Stuff aluminum water pump
TCI Rattler
Kevco NHRA Pan
Nitrous outlet elbow
TPiS 58mm billet TB
36lb injectors
Edelbrock Rails
Aeromotive regulator
Custom fabricated valve covers
Wix filter
Comp break in oil

 

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765 Posts
Here is mine when I first built the engine 4 years ago. 460 SBF with Ford Racing Boss 351 block. 670hp at 6800 and 587 lb-ft at 5200
 

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.520 lobe with 1.85 rocker
Ive done a metric shitload of work with lobes, and i can run that lobe for 150-200 laps without hurting parts. I ran it with a 1.9 steel rocker for 150 in my car to 8300 rp,m for 125 laps with no spring or valvetrain issues.
if i click the thumbnail, its clear for me.
i originally put it up as a picture, was bigger than a house, so i used the thumb.........lol.
 

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LOL, what size carb and intake??
What was peak hp RPM??
That's a bad bitch.
it has an anomaly at 7400 so i tent to throw any odd numbers out.
ipeaks normally around 7200 ish, but its really flat from 6800 -7400 or so, which is why they haul ass.
that was a 1250 APD, and a ported 2897 edelbrock on SR20 heads.
615 alum block. Wet sump. Callies crank. Gibtec pistons. Bullet rod. Its a really nice combination. But not exotic.
 

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it has an anomaly at 7400 so i tent to throw any odd numbers out.
ipeaks normally around 7200 ish, but its really flat from 6800 -7400 or so, which is why they haul ass.
that was a 1250 APD, and a ported 2897 edelbrock on SR20 heads.
615 alum block. Wet sump. Callies crank. Gibtec pistons. Bullet rod. Its a really nice combination. But not exotic.
Wouldn't it like a bigger carb?
 

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Wouldn't it like a bigger carb?
at sea level it would def make more power with a bigger carb. Up here (Denver) they make slightly more with a 2.250 blade, but they dont run as consistent on the track.
A lot of these people are running in supercomp, so they get a stop put on them. Ive never had good luck with a big carb and a stop under it, so i compromise.
I could also make some changes and have it peak higher and make more power, but this is a bracket combo that they want to get 200 runs out of, so we cant be spinning it 8500 RPM all the time.
My personal 582 made more, but i had to spin it higher and push it harder than that.
 

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Roughed it into Pipemax just to see what cfm it may take to make 1250 hp with 15 to 1 cr at 7300 rpm, what correction factor do you use up there on the mountain? Never mind the VE, I just use it to get the targeted HP at the targeted rpm.

611.582 Cubic Inches @ 7300 RPM with 115.00 % Volumetric Efficiency PerCent

Required Intake Flow between 495.4 CFM and 527.1 CFM at 28 Inches
Required Exhaust Flow between 321.1 CFM and 368.3 CFM at 28 Inches

600 RPM/Sec Dyno Test Lowest Low Average Best
Peak HorsePower 1162.1 1209.9 1233.8 1257.7
Peak Torque Lbs-Ft 915.3 952.9 971.7 990.6

HorsePower per CID 1.900 1.978 2.017 2.056
Torque per Cubic Inch 1.497 1.558 1.589 1.620

BMEP in psi 225.7 235.0 239.6 244.2
Carb CFM at 1.5 in Hg. 1486 1653 1736 1820

Target EGT= 1126 degrees F at end of 4 second 600 RPM/Sec Dyno accel. test
Octane (R+M)/2 Method = 114.8 to 115.0 Octane required range
Air Standard Efficiency = 66.69519 % for 15.000:1 Compression Ratio

Peak HorsePower calculated from Cylinder Head Flow CFM only
600 RPM/Sec Dyno Test Lowest Average Best Potential
Head Flow Peak HP = 1090.3 1179.2 1268.2
 

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De
Roughed it into Pipemax just to see what cfm it may take to make 1250 hp with 15 to 1 cr at 7300 rpm, what correction factor do you use up there on the mountain? Never mind the VE, I just use it to get the targeted HP at the targeted rpm.

611.582 Cubic Inches @ 7300 RPM with 115.00 % Volumetric Efficiency PerCent

Required Intake Flow between 495.4 CFM and 527.1 CFM at 28 Inches
Required Exhaust Flow between 321.1 CFM and 368.3 CFM at 28 Inches

600 RPM/Sec Dyno Test Lowest Low Average Best
Peak HorsePower 1162.1 1209.9 1233.8 1257.7
Peak Torque Lbs-Ft 915.3 952.9 971.7 990.6

HorsePower per CID 1.900 1.978 2.017 2.056
Torque per Cubic Inch 1.497 1.558 1.589 1.620

BMEP in psi 225.7 235.0 239.6 244.2
Carb CFM at 1.5 in Hg. 1486 1653 1736 1820

Target EGT= 1126 degrees F at end of 4 second 600 RPM/Sec Dyno accel. test
Octane (R+M)/2 Method = 114.8 to 115.0 Octane required range
Air Standard Efficiency = 66.69519 % for 15.000:1 Compression Ratio

Peak HorsePower calculated from Cylinder Head Flow CFM only
600 RPM/Sec Dyno Test Lowest Average Best Potential
Head Flow Peak HP = 1090.3 1179.2 1268.2
correction depends on the day, ive seen anywhere from 23.7 baro to 24.7, so we can have pretty stupid swings.
That being said, i can get within less than 2-3 hp average corrected on the same motor no matter what the weather is, so its pretty damn consistent. Had to be when V ran PS
Motor gets air from inside a big building, so the outside temp doesnt effect it. Not sure how much it will change your calcs, but its a 615. 4.600 X 4.625
I use a computech weather station, and a correction based on running a motor at sea level on Mike Edwards dyno then bringing it up here to match the same numbers The depac software doesnt have enough correction built in it to account for there being no air in the air up here. But ive done the math based on in the room numbers etc, and its pretty close.
your airflow numbers are pretty accurate. My 582 is higher and the intake on my 582 is much bigger than our bracket shit. Compression is 15.5 btw. I dont use superflow 600/sec, the depac controls acceleration differently. I have no clue on the EGT, I have 8 o2 on the dyno, and dont monitor EGT
BTW, putting this in a dragster, or any car really. If your car is right (car, converter,gearing etc) they run what the dyno says they should run or very close.
 

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Tuned it up a little, but used 114 VE to get the numbers, it's just something for people to look at.

614.905 Cubic Inches @ 7300 RPM with 114.00 % Volumetric Efficiency PerCent

Required Intake Flow between 492.8 CFM and 524.3 CFM at 28 Inches
Required Exhaust Flow between 319.4 CFM and 366.4 CFM at 28 Inches

600 RPM/Sec Dyno Test Lowest Low Average Best
Peak HorsePower 1162.9 1210.7 1234.6 1258.5
Peak Torque Lbs-Ft 916.4 954.1 972.9 991.8

HorsePower per CID 1.891 1.969 2.008 2.047
Torque per Cubic Inch 1.490 1.552 1.582 1.613

BMEP in psi 224.7 234.0 238.6 243.2
Carb CFM at 1.5 in Hg. 1481 1647 1731 1814

Target EGT= 1114 degrees F at end of 4 second 600 RPM/Sec Dyno accel. test
Octane (R+M)/2 Method = 115.6 to 116.0 Octane required range
Air Standard Efficiency = 67.13563 % for 15.500:1 Compression Ratio

Peak HorsePower calculated from Cylinder Head Flow CFM only
600 RPM/Sec Dyno Test Lowest Average Best Potential
Head Flow Peak HP = 1077.4 1169.4 1261.5
 

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it has an anomaly at 7400 so i tent to throw any odd numbers out.
ipeaks normally around 7200 ish, but its really flat from 6800 -7400 or so, which is why they haul ass.
that was a 1250 APD, and a ported 2897 edelbrock on SR20 heads.
615 alum block. Wet sump. Callies crank. Gibtec pistons. Bullet rod. Its a really nice combination. But not exotic.
That's really good power for that combination and rpm. Should be really reliable and really consistent. (y)
 

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86906

Tmeyer Trackboss #1. 434 cube Cleveland with homemade sheetmetal intake dual 1050. 4.155x4.00. Blue Thunder 3.6 heads. Preliminary runs going to switch to 1.8 rockers and add vac pump and kick over 800 if possible.
86907
86908
With single carb and modded Glidden sc1 made [email protected] and [email protected]
0EE3429B-ACAC-42DF-BB4B-6880D442141C.png

Custom Racetec 14:1 coated pistons
CamResearch solid roller
Austrailian muscle parts adjustable belt drive
Molnar 4” stroke forged crank and h-beam rods
Cometic custom head gasket to fit 4.155 bore x.045
Crower stainless 1.73 rockers
Manley valves
Pac springs
Kevko custom kick out pan
King bearings throughout
Milodon windage tray
Massaged Cleveland hooker super comp headers made to fit 3.6 head
Smith bros 3/8 pushrods 8.60 length
Custom porting by Go-flow
Davis craig water pump
Glidden sc1 9.5 intake cut to fit 9.2 deck. Thanks to my sons machine work abilities!!
Lots of phone calls and texting back and forth to get this thing up and going to Dragboss Tim and Tim Meyer.
Pierre Guyon of Dyno Plus for two days dyno time and expertise to fix some of the things I overlooked. Thanks Pierre
Now we have good baseline to refine from here. Thanks to all involved!!
Steve
 

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That looks great Steve K, great Job. I have learned alot from your build..Thanks.
 

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Thanks Dragboss. Couldn’t have done without you guys help. Have few refinements to do and should have good base. Pierre just sent a novel on dyno pulls so have some light reading now. 27 pulls total.
 
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