Mild 454 Engine Build
Racer
Joined: Jun 2009
Posts: 409
Likes: 3
From: St. James, NC
I thought I'd share a recent 454 build with your forum. Built for a 1971 Corvette, although not a correct restoration type build but a every day driver build. Compression turned out right around 9.4 along with a 228 @ .050 hyd roller, A 781 oval port head was used with a 2.190/1.880 valve. The factory cast iron intake was used with a Q-Jet. It will be interesting to see what kind of power this type of build will make for power, I will follow up with a dyno test. Some pictures.
with how things have gone so far.
Melting Slicks
Joined: Jun 2003
Posts: 2,802
Likes: 241
From: Niles, MI
I say about 360-370 horsepower....420 ft/lbs. torque....the low rise intake is a HP killer.....
Please do not use a square bore carb on a Q-Jet manifold.....even the best spacers have a horrible mismatch that not only is detrimental to flow....but wreaks havoc on tuning....
It should run great with a Q-jet.....you will have a lot of fun with it.....lots of torque down low
Jebby
Please do not use a square bore carb on a Q-Jet manifold.....even the best spacers have a horrible mismatch that not only is detrimental to flow....but wreaks havoc on tuning....
It should run great with a Q-jet.....you will have a lot of fun with it.....lots of torque down low
Jebby
Last edited by Kid Vette; Dec 21, 2015 at 03:31 PM.
Dr. Detroit
Joined: Mar 2012
Posts: 10,095
Likes: 4,025
From: New Braunfels Texas
462 HP @ 5600 RPM with 532 TQ @ 3500 on this one with a flat tappet cam. The one on this thread (w/roller cam) will make more.
Jebby
Le Mans Master
Joined: Mar 2001
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From: Watkinsville, GA and Glen Cove, NY
Drifting
Joined: Oct 2005
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From: Angier nc
Racer
Joined: Jun 2009
Posts: 409
Likes: 3
From: St. James, NC
He knows. That was my choice...I wanted to stay close to the LS5 theme. I wanted the engine to look OEM and was willing to sacrifice some HP. Anyway, it will be way stronger than the original LS5, which will now be in safekeeping.
Pro
Joined: Dec 2004
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Likes: 2
From: Connecticut
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Thread Starter
Racer
Joined: Aug 2011
Posts: 493
Likes: 217
I finished the 454 build, I noticed it was pulling quite a bit of vacuum at WOT, 2 inches, Idle vacuum was 13 inches @ 860 RPM @ 6400 feet, vacuum should come in at 17-18 inches @ 1000 feet. Very smooth and mild. BSFC was from .420-.470.
Last edited by Vortecpro; Dec 28, 2015 at 08:25 PM.
Race Director
Joined: Jan 2000
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From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
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Nice! Going to be a nice Christmas present!!!
JIM
JIM
Burning Brakes
Joined: Nov 2012
Posts: 788
Likes: 100
From: Indianapolis IN
What's next ? A ported intake and a modified large bore Qjet ? That's a lot of vac @ WOT !
Racer
Joined: Jun 2009
Posts: 409
Likes: 3
From: St. James, NC
Mark hit it out of the Ballpark. A closer look at the dyno sheet reals 553 torque at 3500 and 501 HP at 5500. Super happy with the results.
Racer
Joined: Jun 2009
Posts: 409
Likes: 3
From: St. James, NC
Le Mans Master
Joined: Apr 2015
Posts: 9,428
Likes: 124
I thought I'd share a recent 454 build with your forum. Built for a 1971 Corvette, although not a correct restoration type build but a every day driver build. Compression turned out right around 9.4 along with a 228 @ .050 hyd roller, A 781 oval port head was used with a 2.190/1.880 valve. The factory cast iron intake was used with a Q-Jet. It will be interesting to see what kind of power this type of build will make for power, I will follow up with a dyno test. Some pictures.
Anyway the point is that yours should run pretty darn good.
Melting Slicks
Joined: Jun 2003
Posts: 2,802
Likes: 241
From: Niles, MI
Also, what's a good number for vacuum at WOT? I've always heard you need at least 1-1.5 so 2 doesn't seem that high. Do you have a target you shoot for?
Can you post bigger pics of the dyno printout? My old eyes can't make out the numbers.
Last edited by Kid Vette; Dec 29, 2015 at 05:48 PM. Reason: Added comment on pics
Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
Damn.. I was close on the torque but guessed a little high on the hp. No doubt that intake is a killer.. Probably 40hp + hiding in there.
Gives the owner some room to grow down the road if he decides to put an L88 hood on it...
Still damn good power, should get him in the 11s and look stock while doing it.
Gives the owner some room to grow down the road if he decides to put an L88 hood on it...
Still damn good power, should get him in the 11s and look stock while doing it.
Racer
Joined: Jun 2009
Posts: 409
Likes: 3
From: St. James, NC
Damn.. I was close on the torque but guessed a little high on the hp. No doubt that intake is a killer.. Probably 40hp + hiding in there.
Gives the owner some room to grow down the road if he decides to put an L88 hood on it...
Still damn good power, should get him in the 11s and look stock while doing it.
Gives the owner some room to grow down the road if he decides to put an L88 hood on it...
Still damn good power, should get him in the 11s and look stock while doing it.
Racer
Joined: Jun 2009
Posts: 409
Likes: 3
From: St. James, NC
BSFC = Brake Specific Fuel Consumption? Could you explain what the numbers mean? I believe a lower number means you are getting more power with the same amount of fuel, right? Seems I heard somebody say .450 is good and below .420 is awesome. Does that sound right?
Also, what's a good number for vacuum at WOT? I've always heard you need at least 1-1.5 so 2 doesn't seem that high. Do you have a target you shoot for?
Can you post bigger pics of the dyno printout? My old eyes can't make out the numbers.
Also, what's a good number for vacuum at WOT? I've always heard you need at least 1-1.5 so 2 doesn't seem that high. Do you have a target you shoot for?
Can you post bigger pics of the dyno printout? My old eyes can't make out the numbers.
I was able to read the numbers better by increasing my display size to 175%. Those are some good dyno #s