1971 LS6 Engine Dyno Results!
#1
Instructor
Thread Starter
1971 LS6 Engine Dyno Results!
Hey Guys,
Figured I would share my results of my fresh engine build for my 71 454.
I used the original block with LS6 square port heads, and LS6 intake. Holley 850 double pumper. Heads were rebuilt, engine was 0.30 over. Around 10.2:1 CR.
Roller tip rockers, Hydraulic cam as well
On the engine dyno it made 425hp and 496lb-ft of torque.
The torque was already at 480lb-ft by 2800RPM which is a very low RPM for square port heads! - Very excited as many people told me I needed round ports to achieve this!
Huge improvement to the tired LS5 that was it in when I got it a few months ago!
Figured I would share my results of my fresh engine build for my 71 454.
I used the original block with LS6 square port heads, and LS6 intake. Holley 850 double pumper. Heads were rebuilt, engine was 0.30 over. Around 10.2:1 CR.
Roller tip rockers, Hydraulic cam as well
On the engine dyno it made 425hp and 496lb-ft of torque.
The torque was already at 480lb-ft by 2800RPM which is a very low RPM for square port heads! - Very excited as many people told me I needed round ports to achieve this!
Huge improvement to the tired LS5 that was it in when I got it a few months ago!
Last edited by Zellerz93; 04-01-2015 at 12:11 AM.
#6
Instructor
Thread Starter
Thanks everyone!
I am very excited.
Working on restoring it right now so i won't get to enjoy the engine for a little while, but once it is in it should be fun!
I am very excited.
Working on restoring it right now so i won't get to enjoy the engine for a little while, but once it is in it should be fun!
#7
Le Mans Master
Very cool.
Stock cam?
Probably way too late, but if that was my engine, I would have used a moderate hydraulic roller cam and picked up another 100 hp, with stock drivability.
Stock cam?
Probably way too late, but if that was my engine, I would have used a moderate hydraulic roller cam and picked up another 100 hp, with stock drivability.
#8
Melting Slicks
The OP is my son.
He's been brought up around corvettes and muscle cars his whole life.
Helped me to restore a 65 corvette, and a few other cars. We learned together, and are still learning as we go.
This 71 is his....I am helping him to restore it but he calls the shots....and pays the bills
Pretty impressive for a 21 year old who is in university full time.
His friends are into newer cars, like mustangs, but he has always been into the old time muscle cars, especially corvettes. Rare for today's kids.
Needless to say I am very proud of him
He's been brought up around corvettes and muscle cars his whole life.
Helped me to restore a 65 corvette, and a few other cars. We learned together, and are still learning as we go.
This 71 is his....I am helping him to restore it but he calls the shots....and pays the bills
Pretty impressive for a 21 year old who is in university full time.
His friends are into newer cars, like mustangs, but he has always been into the old time muscle cars, especially corvettes. Rare for today's kids.
Needless to say I am very proud of him
#9
Team Owner
Member Since: Oct 1999
Location: Land of Thunder
Posts: 33,586
Received 217 Likes
on
160 Posts
2018 C2 of Year Finalist
St. Jude Donor '12-'13-'14-'15, '19
The OP is my son.
He's been brought up around corvettes and muscle cars his whole life.
Helped me to restore a 65 corvette, and a few other cars. We learned together, and are still learning as we go.
This 71 is his....I am helping him to restore it but he calls the shots....and pays the bills
Pretty impressive for a 21 year old who is in university full time.
His friends are into newer cars, like mustangs, but he has always been into the old time muscle cars, especially corvettes. Rare for today's kids.
Needless to say I am very proud of him
He's been brought up around corvettes and muscle cars his whole life.
Helped me to restore a 65 corvette, and a few other cars. We learned together, and are still learning as we go.
This 71 is his....I am helping him to restore it but he calls the shots....and pays the bills
Pretty impressive for a 21 year old who is in university full time.
His friends are into newer cars, like mustangs, but he has always been into the old time muscle cars, especially corvettes. Rare for today's kids.
Needless to say I am very proud of him
#12
Melting Slicks
cam is a comp cam 11-242-3 Xtreme Energy XE268X
Here's a link to the specs:
http://www.compcams.com/Company/CC/c...?csid=395&sb=2
And here are the dyno results
Here's a link to the specs:
http://www.compcams.com/Company/CC/c...?csid=395&sb=2
And here are the dyno results
#13
1st Gear
Member Since: Jun 2016
Location: Toronto, Ontario
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
Hey Guys,
Figured I would share my results of my fresh engine build for my 71 454.
I used the original block with LS6 square port heads, and LS6 intake. Holley 850 double pumper. Heads were rebuilt, engine was 0.30 over. Around 10.2:1 CR.
Roller tip rockers, Hydraulic cam as well
On the engine dyno it made 425hp and 496lb-ft of torque.
The torque was already at 480lb-ft by 2800RPM which is a very low RPM for square port heads! - Very excited as many people told me I needed round ports to achieve this!
Huge improvement to the tired LS5 that was it in when I got it a few months ago!
Figured I would share my results of my fresh engine build for my 71 454.
I used the original block with LS6 square port heads, and LS6 intake. Holley 850 double pumper. Heads were rebuilt, engine was 0.30 over. Around 10.2:1 CR.
Roller tip rockers, Hydraulic cam as well
On the engine dyno it made 425hp and 496lb-ft of torque.
The torque was already at 480lb-ft by 2800RPM which is a very low RPM for square port heads! - Very excited as many people told me I needed round ports to achieve this!
Huge improvement to the tired LS5 that was it in when I got it a few months ago!
Thanks
Last edited by 1967SS427; 06-21-2016 at 08:37 PM.
#14
Instructor
Thread Starter
They dynoed it to get me some numbers but also broke in the cam for me.
It's actually not even in the car yet. Ended up doing a frame off so the engine is sitting on the chassis.