So tell us about this 331
Horsepower Vs. Cubic Inches?? Help
Thread Starter
Instructor
Joined: Oct 2007
Posts: 118
Likes: 0
Horsepower Vs. Cubic Inches?? Help
Ok, so I have an SBC that was worked to a 355 and with the heads and intake produces 430HP. I was looking to buy a 383 short block and use all the components off my engine for the rest of the build. I am not sure what the HP would be? Do you guys think it's worth going to bigger CI if my engine can already push out 430HP as a 355?
355 SBC
World Products Sportsmand II heads (worked)
9.5:1 compression
Comp Cams TPI roller cam
Edelbrock ProFlo2 intake
Oppinions? Say what you think.
355 SBC
World Products Sportsmand II heads (worked)
9.5:1 compression
Comp Cams TPI roller cam
Edelbrock ProFlo2 intake
Oppinions? Say what you think.
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
If your getting 400+ hp out of a 355 without power adders don't mess with it.
If your going to swap the existing guts out of the running 355 directly why not just overbore your current block if you want more cubes.
If your looking to go with "stroker" application that's a different animal.
If your going to swap the existing guts out of the running 355 directly why not just overbore your current block if you want more cubes.
If your looking to go with "stroker" application that's a different animal.
Last edited by engle1147; Feb 27, 2010 at 10:57 AM.
Drifting
Joined: Aug 2000
Posts: 1,614
Likes: 0
From: Colleyville Texas
Ok, so I have an SBC that was worked to a 355 and with the heads and intake produces 430HP. I was looking to buy a 383 short block and use all the components off my engine for the rest of the build. I am not sure what the HP would be? Do you guys think it's worth going to bigger CI if my engine can already push out 430HP as a 355?
355 SBC
World Products Sportsmand II heads (worked)
9.5:1 compression
Comp Cams TPI roller cam
Edelbrock ProFlo2 intake
Oppinions? Say what you think.
355 SBC
World Products Sportsmand II heads (worked)
9.5:1 compression
Comp Cams TPI roller cam
Edelbrock ProFlo2 intake
Oppinions? Say what you think.
My 350 made 365RWHP when I went to the 396. The 396 made 409RWHP after the change which is 44 more. Realize there are other factors to consider. With my new heads its even more now.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
The torque at all rpms is what will sell you on the 383. I promise you wont go back to a 350 after having the bigger motor. 33 cubes doesnt sound like much but it will take on a total different characteristic. Sure youll pick up some hp. If it were me Id cam accordingly, the 383 will make your current cam act a little smaller in sound and powerband also. Maybe step it up 6-8 deg duration @.050 to get about the same powerband you had with the 355
Burning Brakes
Joined: Jul 2006
Posts: 1,080
Likes: 2
From: Pittsburgh PA
The torque at all rpms is what will sell you on the 383. I promise you wont go back to a 350 after having the bigger motor. 33 cubes doesnt sound like much but it will take on a total different characteristic. Sure youll pick up some hp. If it were me Id cam accordingly, the 383 will make your current cam act a little smaller in sound and powerband also. Maybe step it up 6-8 deg duration @.050 to get about the same powerband you had with the 355
Race Director
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
Ok, so I have an SBC that was worked to a 355 and with the heads and intake produces 430HP. I was looking to buy a 383 short block and use all the components off my engine for the rest of the build. I am not sure what the HP would be? Do you guys think it's worth going to bigger CI if my engine can already push out 430HP as a 355?
355 SBC
World Products Sportsmand II heads (worked)
9.5:1 compression
Comp Cams TPI roller cam
Edelbrock ProFlo2 intake
Oppinions? Say what you think.
355 SBC
World Products Sportsmand II heads (worked)
9.5:1 compression
Comp Cams TPI roller cam
Edelbrock ProFlo2 intake
Oppinions? Say what you think.
Drifting
Joined: Aug 2006
Posts: 1,279
Likes: 0
From: Delray beach FL
my 331 output more than 600 rwhp at 8400 rpm.
because of destrock pistons profile, it allow higher rpms with high comp ratio...
going the other way 383 stroker requires way more energy to deploy in order to achieve it and you stay low rpm zone at 6000 anyway. Way too low.
Even if you eventualy can reach more HP with more cubic inchs, its all a question of balance first to get the best HP/displacment ratio.
For exemple, my honda CBR 1000 (1 liter) output 190 hp. Means its a about the same as a first gen C4 with 6 times less displacment ( 350 CI 5.7L).
because of destrock pistons profile, it allow higher rpms with high comp ratio...
going the other way 383 stroker requires way more energy to deploy in order to achieve it and you stay low rpm zone at 6000 anyway. Way too low.
Even if you eventualy can reach more HP with more cubic inchs, its all a question of balance first to get the best HP/displacment ratio.
For exemple, my honda CBR 1000 (1 liter) output 190 hp. Means its a about the same as a first gen C4 with 6 times less displacment ( 350 CI 5.7L).
Last edited by frenchyoliver; Feb 27, 2010 at 04:45 PM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Instructor
Joined: Jul 2004
Posts: 228
Likes: 1
From: Oakwood GA
Ok, so I have an SBC that was worked to a 355 and with the heads and intake produces 430HP. I was looking to buy a 383 short block and use all the components off my engine for the rest of the build. I am not sure what the HP would be? Do you guys think it's worth going to bigger CI if my engine can already push out 430HP as a 355?
355 SBC
World Products Sportsmand II heads (worked)
9.5:1 compression
Comp Cams TPI roller cam
Edelbrock ProFlo2 intake
Oppinions? Say what you think.
355 SBC
World Products Sportsmand II heads (worked)
9.5:1 compression
Comp Cams TPI roller cam
Edelbrock ProFlo2 intake
Oppinions? Say what you think.
Melting Slicks
Joined: Mar 2002
Posts: 3,108
Likes: 126
From: S.L.C. UT
As inexpensive as it is to build a 383, I don't build 350 or smaller motors. A 383 really isn't any more money to build than a 350. Like mentioned, the torque of a 383 is a day/ night difference over a 350. Our cars are heavy by race car standards, and the extra torque makes a huge difference getting that weight moving.
Thread Starter
Instructor
Joined: Oct 2007
Posts: 118
Likes: 0
Thanks for the imput guys. The engine puts out about 475lbs of torque and it is going into a 59 vette that i will drive more like a granny. yes i'll have some fun with it. but it'll never see the track. it's a toy car to have fun with.
so with that said, if my 355 has 430hp/475tq, would you all agree that it's plenty for a cruiser which is what i am intending the car to be in the first place?
thanks guys.
so with that said, if my 355 has 430hp/475tq, would you all agree that it's plenty for a cruiser which is what i am intending the car to be in the first place?
thanks guys.
Burning Brakes
Joined: Jul 2006
Posts: 1,080
Likes: 2
From: Pittsburgh PA
Guy on thirdgen just dyno'd his superram 383 and it dynos 517 or so peak torque, but it has 500 as low as 2600 rpm where the dyno run started. Keeps over 500 lbft from 2600 to 4500 rpm. IT has 467hp at 5500 rpm. Nasty street motor there. It probably has over 400lb ft off idle! That will get a car moving
Safety Car
Joined: May 2002
Posts: 4,659
Likes: 82
From: Toronto ontario
Guy on thirdgen just dyno'd his superram 383 and it dynos 517 or so peak torque, but it has 500 as low as 2600 rpm where the dyno run started. Keeps over 500 lbft from 2600 to 4500 rpm. IT has 467hp at 5500 rpm. Nasty street motor there. It probably has over 400lb ft off idle! That will get a car moving
Drifting
Joined: Aug 2006
Posts: 1,279
Likes: 0
From: Delray beach FL
classic stuffs.
HTC Crank, Carillo 6.2 inch rods with CPX forging pistons, SB2 NCN Block, prepared by rocket engine devlopment, 11.5 compression ratio, 114 octane fuel, full hand ported LaCross heads with exceldyne titanium pushrod & valves, crower extreme duty roller liffter with pin oilers, Jesel Cam drive and rockerarm setup, custom MSD ignition, Barnes 5 stages oil pump, carb. 830, custom exaust etc etc....
We dynoed it at 560 hp @ 8400.
I dont agree about "there is no replacement for displacement", this is old "muscle car" 70 s mentality.
High displacement means extreme high cost if you want to get up the RPMs. 6000 rpm is low.
did it once on a viper and it costed me more than 50.000 $ for engine.
My C4 GT1 engine only start to output tons of HP a 6000 rpm till 8400.
HTC Crank, Carillo 6.2 inch rods with CPX forging pistons, SB2 NCN Block, prepared by rocket engine devlopment, 11.5 compression ratio, 114 octane fuel, full hand ported LaCross heads with exceldyne titanium pushrod & valves, crower extreme duty roller liffter with pin oilers, Jesel Cam drive and rockerarm setup, custom MSD ignition, Barnes 5 stages oil pump, carb. 830, custom exaust etc etc....
We dynoed it at 560 hp @ 8400.
I dont agree about "there is no replacement for displacement", this is old "muscle car" 70 s mentality.
High displacement means extreme high cost if you want to get up the RPMs. 6000 rpm is low.
did it once on a viper and it costed me more than 50.000 $ for engine.
My C4 GT1 engine only start to output tons of HP a 6000 rpm till 8400.
Last edited by frenchyoliver; Feb 28, 2010 at 05:29 AM.
Race Director
Joined: Jan 2005
Posts: 10,641
Likes: 13
From: Slidell Louisiana
classic stuffs.
HTC Crank, Carillo 6.2 inch rods with CPX forging pistons, SB2 NCN Block, prepared by rocket engine devlopment, 11.5 compression ratio, 114 octane fuel, full hand ported LaCross heads with exceldyne titanium pushrod & valves, crower extreme duty roller liffter with pin oilers, Jesel Cam drive and rockerarm setup, custom MSD ignition, Barnes 5 stages oil pump, carb. 830, custom exaust etc etc....
We dynoed it at 560 hp @ 8400.
I dont agree about "there is no replacement for displacement", this is old "muscle car" 70 s mentality.
High displacement means extreme high cost if you want to get up the RPMs. 6000 rpm is low.
did it once on a viper and it costed me more than 50.000 $ for engine.
My C4 GT1 engine only start to output tons of HP a 6000 rpm till 8400.
HTC Crank, Carillo 6.2 inch rods with CPX forging pistons, SB2 NCN Block, prepared by rocket engine devlopment, 11.5 compression ratio, 114 octane fuel, full hand ported LaCross heads with exceldyne titanium pushrod & valves, crower extreme duty roller liffter with pin oilers, Jesel Cam drive and rockerarm setup, custom MSD ignition, Barnes 5 stages oil pump, carb. 830, custom exaust etc etc....
We dynoed it at 560 hp @ 8400.
I dont agree about "there is no replacement for displacement", this is old "muscle car" 70 s mentality.
High displacement means extreme high cost if you want to get up the RPMs. 6000 rpm is low.
did it once on a viper and it costed me more than 50.000 $ for engine.
My C4 GT1 engine only start to output tons of HP a 6000 rpm till 8400.
Great avatar...Superdupont, however, most Americans will miss the Humor/Irony of your choice.
Last edited by aboatguy; Feb 28, 2010 at 08:03 AM.