Thread: How do i get 400 hp from a 355?

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Just dynoed exact engine and made 438ft/lbs torque@4400 and 449hp @5900. It has a very flat torque curve and doesn't dip in hp until after 6300 rpm. A 1" open spacer added 12hp to the top but cost just as much or more torque in the lower rpm.[/QUOTE]

Looks like a good combo, just a question about the power curve, I notice that it torques at 4400 rpm top end. Do you have any info on when it starts to make power ? And is the power curve fairly broad ?

Oh yeah that was another question I was going to ask "has anybody figured out how to upload or make a graph to go on the treads ?"

At 3K, which is where the dyno started loading, it had over 350ft/lbs and by 3400 it was over 400ft/lbs and didn't fall below 400ft/lbs until after 5300. Will be at the track tomorrow to see what kind of times it will pull in a '72 Nova with 3.90 gears and th-350 with 3500 stall.

Originally Posted by camaro_fever68

Plenty money = Start from scratch

1. Rotating Assembly
356-B13005L+040 SB-Chevy 383ci Street & Strip Rotating Assembly, .040'' Overbore
Bore x Stroke: 4.040'' x 3.750''
Rod Length: 5.700''
Pistons: Keith Black -7cc Flat Top
Comp Ratio: 11.7:1 w/58cc, 10.9:1 w/64cc, 9.6:1 w/76cc
1-piece Rear Main Seal

$945.99

2. Heads
158-1011004 SB-Chevy Race-Rite 180 23° Cylinder Heads
180cc Intake Ports
67cc Combustion Chambers
2.020'' Int/1.600'' Exh Valves
1.470'' Valve Springs
.525'' Max Lift
Straight Plug
Assembled, Sold in Pairs

$1,299.99

3. Cam
CompCams 249-CL12-250-3 Xtreme Energy XE284H Hydraulic Flat Tappet Camshaft & Lifter Kit
Lift: .507''/.510''
Duration: 284°/296°
RPM Range: 2300-6500
$175.99

4. Misc.
Head Gasket: 375-1094
Embossed Shim
Bore: 4.100''
Compressed Thickness: .015''
$19.99


Pushrods: Comp Cams Magnum Pushrods

Magnum Pushrods are the perfect complement to your Hot Street, Bracket, Oval Track, or any other high performance engine. Magnum Pushrods™ are one-piece .080”wall chromemoly steel. These pushrods are an affordable alternative for engines needing a pushrod to stand up to higher spring pressures and the associated stresses of a high performance engine. All Magnum Pushrods™ are Heat Treated to be compatible with guide plates.

Intake: 350-7501 SB-Chevy 262-400
Performer RPM Air-Gap
$203.99


Carb: 510-O-80770 770cfm Street Avenger Carb
Electric choke
400 to 500 HP
$364.99


NOTES:
You will have 10.5:1 Static Compression Ratio and 8.25:1 Dynamic Compression Ratio.
The embossed shim gasket will work with a stock deck height of 9.025 with the piston .025" in the hole to end with a .040" quench.
You will need to check pushrod geometry and get the correct length pushrods accordingly.
Use 1.5 rockers.

Just dynoed exact engine and made 438ft/lbs torque@4400 and 449hp @5900. It has a very flat torque curve and doesn't dip in hp until after 6300 rpm. A 1" open spacer added 12hp to the top but cost just as much or more torque in the lower rpm.

is that enough compression to use the xe284? I bet you would make more power with that combo if you used the xe274 instead.

Oh and I think he already has the edelbrock rpm intake

just put a weiand 142 blower on it...fits under the hood...I have one on my 60 over 350(360")...early Lt1 2.02/1.60 angle plugg heads ported to the max...110 ls with about .555 lift with the 1.6 crower roller rockers (hydraulic cam) 850 holley modified by AED for the blower..hooker 1 7/8 super comp headers with 3 1/2" collectors...Ross 8-1 pistone all O ringed and studded...steel crank and "pinked" rods.....without the blower it was making just over 400hp...with the blower and about 12 lbs of boost...close to 600....slap the blower on it.....

H beam rods are cheap and go with the mls head gaskets cometics and some good forged pistons and a small blower and have at it

Originally Posted by larry62t-bird

is that enough compression to use the xe284? I bet you would make more power with that combo if you used the xe274 instead.

Oh and I think he already has the edelbrock rpm intake

It would make peak torque and hp lower in the band with 274 but will cost the average hp and torque numbers. The 274 will also bring the dynamic CR to almost 8.6 and it's getting pretty tuff to find a decent gas to burn without mixing race fuel. 8.4 Dynamic is about max for pump gas although I do push the limits with some tight quench and lots of prep.

Originally Posted by camaro_fever68

At 3K, which is where the dyno started loading, it had over 350ft/lbs and by 3400 it was over 400ft/lbs and didn't fall below 400ft/lbs until after 5300. Will be at the track tomorrow to see what kind of times it will pull in a '72 Nova with 3.90 gears and th-350 with 3500 stall.

Straight out the gate today we turned a 12.10 ET at 112mph. Dropped the jet's down a size in front and rear and run a 11.97 at 112 also. 60ft wasn't doing so well with a 1.63 best of the two runs. We adjusted tire pressure and the Caltracs and on the next run it pulled a 1.54 60ft and run a 11.92 at 113. Weather was horrible with a storm coming and the rain drops shut us down. Total timing was 35* and we didn't get a chance to play with it any.

Originally Posted by camaro_fever68

Plenty money = Start from scratch

1. Rotating Assembly
356-B13005L+040 SB-Chevy 383ci Street & Strip Rotating Assembly, .040'' Overbore
Bore x Stroke: 4.040'' x 3.750''
Rod Length: 5.700''
Pistons: Keith Black -7cc Flat Top
Comp Ratio: 11.7:1 w/58cc, 10.9:1 w/64cc, 9.6:1 w/76cc
1-piece Rear Main Seal

$945.99

2. Heads
158-1011004 SB-Chevy Race-Rite 180 23° Cylinder Heads
180cc Intake Ports
67cc Combustion Chambers
2.020'' Int/1.600'' Exh Valves
1.470'' Valve Springs
.525'' Max Lift
Straight Plug
Assembled, Sold in Pairs

$1,299.99

3. Cam
CompCams 249-CL12-250-3 Xtreme Energy XE284H Hydraulic Flat Tappet Camshaft & Lifter Kit
Lift: .507''/.510''
Duration: 284°/296°
RPM Range: 2300-6500
$175.99

4. Misc.
Head Gasket: 375-1094
Embossed Shim
Bore: 4.100''
Compressed Thickness: .015''
$19.99


Pushrods: Comp Cams Magnum Pushrods

Magnum Pushrods are the perfect complement to your Hot Street, Bracket, Oval Track, or any other high performance engine. Magnum Pushrods™ are one-piece .080”wall chromemoly steel. These pushrods are an affordable alternative for engines needing a pushrod to stand up to higher spring pressures and the associated stresses of a high performance engine. All Magnum Pushrods™ are Heat Treated to be compatible with guide plates.

Intake: 350-7501 SB-Chevy 262-400
Performer RPM Air-Gap
$203.99


Carb: 510-O-80770 770cfm Street Avenger Carb
Electric choke
400 to 500 HP
$364.99


NOTES:
You will have 10.5:1 Static Compression Ratio and 8.25:1 Dynamic Compression Ratio.
The embossed shim gasket will work with a stock deck height of 9.025 with the piston .025" in the hole to end with a .040" quench.
You will need to check pushrod geometry and get the correct length pushrods accordingly.
Use 1.5 rockers.

Just dynoed exact engine and made 438ft/lbs torque@4400 and 449hp @5900. It has a very flat torque curve and doesn't dip in hp until after 6300 rpm. A 1" open spacer added 12hp to the top but cost just as much or more torque in the lower rpm.

well i just started from scratch

Originally Posted by smokinwoody

just put a weiand 142 blower on it...fits under the hood...I have one on my 60 over 350(360")...early Lt1 2.02/1.60 angle plugg heads ported to the max...110 ls with about .555 lift with the 1.6 crower roller rockers (hydraulic cam) 850 holley modified by AED for the blower..hooker 1 7/8 super comp headers with 3 1/2" collectors...Ross 8-1 pistone all O ringed and studded...steel crank and "pinked" rods.....without the blower it was making just over 400hp...with the blower and about 12 lbs of boost...close to 600....slap the blower on it.....

yeah i have a EDELBROCK RPM INTAKE EDELBROCK performer 750 carb, comp cam ,bored out .30 (355), shaved the heads .030 heddmann headers heddmann glasspacks roller rockers