Dyno today Results
Race Director
Joined: Jan 2000
Posts: 13,018
Likes: 2,262
From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
2020 Corvette of the Year (performance mods)
C2 of Year Winner (performance mods) 2019
2017 C2 of Year Finalist
That's one sweet smallblock!! Congratulationson some stout numbers.
That's deep 11's/120+ mph for sure!!
Try some new points....I had a 7 year old set that finally started bouncing around 6900 rpm. New ones put me right back over 7000+.
JIM
That's deep 11's/120+ mph for sure!!
Try some new points....I had a 7 year old set that finally started bouncing around 6900 rpm. New ones put me right back over 7000+.
JIM
Thread Starter
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Thanks Jim. I will try a new set of HD points and see what happens. Unfortunatly for us living up where it gets cold I am pretty much done for the year. We were fortunate that the weather held out this long. It will probably be this spring before I get it back out on the road. Time for some upgrades and a little freshening up of some components.
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
He has over 40 HP more so it's definetely a mid 11 second ride WITH traction!
Race Director
Joined: Feb 1999
Posts: 19,659
Likes: 34
From: Lenoir City Tennessee
Ci 6, 8 & 10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15
Sounds really good Gordon. I really should be out in the garage tinkering with the vette more often. I have not touched it in about 2 or 3 weeks. 
Thread Starter
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
I have a set (2) Convo Pro wheels (15 x 8.5) with 28 x 11.5 - 15 ET Street tires with tubes (95% tread remaining..only 10 passes with short burnouts on the tires and they are good for about 150 - 200 passes) for less than 1/2 the new price!!
Those wheels are only 13 lbs each which should further lower the ET's..
In front, you'll need softer springs and some adjustable 90/10's to bring the front up some to get more weight to the rear... Just a few things and you'll be there!!
Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
GREAT numbers Gordan!! That thing is making some serious power. I agree with Grandsport, in a C3 with heavy halfshafts swinging I would think the loss for a stick would be 20-25% and an auto would DEFINETLY be 25-30%, if not 35%. TH400s eat tons of HP, the IRS eats a lot of HP and normally the exhaust systems on C3s are restrictive due to the bends etc(tight fit)
I would bet money that Gordon's SB is making 500-520hp on a engine dyno.
73JST, I think the numbers on your car are pretty good also!! I mean 300 rwhp with a TH400...?? That thing is putting out 375-400hp at the crank. Pretty damn strong for a 9.5-1, 350. That is NOTHING to be dissappointed about.
BTW with a good stall converter and some decent gears in the rear, that 73' will go some high 12s to low 13s...very respectable basically a stocker.
Gordon, your car is going 11s easy, get that biatch to the track!
I would bet money that Gordon's SB is making 500-520hp on a engine dyno.
73JST, I think the numbers on your car are pretty good also!! I mean 300 rwhp with a TH400...?? That thing is putting out 375-400hp at the crank. Pretty damn strong for a 9.5-1, 350. That is NOTHING to be dissappointed about.
BTW with a good stall converter and some decent gears in the rear, that 73' will go some high 12s to low 13s...very respectable basically a stocker.
Gordon, your car is going 11s easy, get that biatch to the track!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Very strong motor and I agree it would put out around 500 HP on an engine dyno. Do you have the dyno printout ? I would like to see the torque curve
Thread Starter
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Drifting
Joined: Nov 2002
Posts: 1,951
Likes: 1
From: Shore NJ
GREAT numbers Gordan!! That thing is making some serious power. I agree with Grandsport, in a C3 with heavy halfshafts swinging I would think the loss for a stick would be 20-25% and an auto would DEFINETLY be 25-30%, if not 35%. TH400s eat tons of HP, the IRS eats a lot of HP and normally the exhaust systems on C3s are restrictive due to the bends etc(tight fit)
I would bet money that Gordon's SB is making 500-520hp on a engine dyno.
73JST, I think the numbers on your car are pretty good also!! I mean 300 rwhp with a TH400...?? That thing is putting out 375-400hp at the crank. Pretty damn strong for a 9.5-1, 350. That is NOTHING to be dissappointed about.
BTW with a good stall converter and some decent gears in the rear, that 73' will go some high 12s to low 13s...very respectable basically a stocker.
Gordon, your car is going 11s easy, get that biatch to the track!
I would bet money that Gordon's SB is making 500-520hp on a engine dyno.
73JST, I think the numbers on your car are pretty good also!! I mean 300 rwhp with a TH400...?? That thing is putting out 375-400hp at the crank. Pretty damn strong for a 9.5-1, 350. That is NOTHING to be dissappointed about.
BTW with a good stall converter and some decent gears in the rear, that 73' will go some high 12s to low 13s...very respectable basically a stocker.
Gordon, your car is going 11s easy, get that biatch to the track!
...wait a minute, I know, it's my old water pump on his engine 
that's it!
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
GREAT numbers Gordan!! That thing is making some serious power. I agree with Grandsport, in a C3 with heavy halfshafts swinging I would think the loss for a stick would be 20-25% and an auto would DEFINETLY be 25-30%, if not 35%. TH400s eat tons of HP, the IRS eats a lot of HP and normally the exhaust systems on C3s are restrictive due to the bends etc(tight fit)
I would bet money that Gordon's SB is making 500-520hp on a engine dyno.
73JST, I think the numbers on your car are pretty good also!! I mean 300 rwhp with a TH400...?? That thing is putting out 375-400hp at the crank. Pretty damn strong for a 9.5-1, 350. That is NOTHING to be dissappointed about.
BTW with a good stall converter and some decent gears in the rear, that 73' will go some high 12s to low 13s...very respectable basically a stocker.
Gordon, your car is going 11s easy, get that biatch to the track!
I would bet money that Gordon's SB is making 500-520hp on a engine dyno.
73JST, I think the numbers on your car are pretty good also!! I mean 300 rwhp with a TH400...?? That thing is putting out 375-400hp at the crank. Pretty damn strong for a 9.5-1, 350. That is NOTHING to be dissappointed about.
BTW with a good stall converter and some decent gears in the rear, that 73' will go some high 12s to low 13s...very respectable basically a stocker.
Gordon, your car is going 11s easy, get that biatch to the track!
I have experience with the TH400 myself.. I used to own a black '69 Vert and bought a 383/439 HP engine for it. I had a TH400 in that car and went to a chassis dyno and only dynoed 289 HP.. That was slightly less than a 35% loss.. OK, it was on a Mustang brand dyno and they tend to show lower numbers than Dynojets.. I was also running all mechanical accessories which didn't help either..
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Next to Gordon's car I was pretty disapointed, but as I said the THD400 really eats up the power, sure would like to know exactly how much it eats up and the halfshafts/drivetrain. I have a good converter (breakaway) and 3:55 gears to keep it streetable and about as much cam it will take for the auto trans, I was planning on installing a BTP 2004R overdrive trans this winter but that won't help the power loss, maybe get the trans looked at for effeciency and change the pistons for some more compression... hard to stay with Gordons 72, it was quite impressive on the dyno ...wait a minute, I know, it's my old water pump on his engine that's it!
...wait a minute, I know, it's my old water pump on his engine that's it!The powerglide is the most efficient transmission, followed by TH350 and then the TH200R4.
Thread Starter
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Drifting
Joined: Nov 2002
Posts: 1,951
Likes: 1
From: Shore NJ
From what others have posted and what I've been researching that THD400 and drive train/axles really does eat HP, and the numbers are between 25-35%, so with an average of 30% say we were right on the money with the HP and TQ numbers for my "tu---oops my 73 (inside joke with Gordon)based on your old numbers of 400-420 hp at the flywheel we got the max out of the engine through the jet changes (76/83 to 78/89) and the A/F pretty flat through the rpm range. I feel alittle better now, but not much...
Melting Slicks
Joined: Jan 2006
Posts: 3,028
Likes: 2
From: North NJ
Awsome numbers....and rather close to me location wise.
Any word on their engine building repuation? I've been looking for a good reputable, not expensive engine builder to build me a big block this winter. Every shop around Jersey is soooo darn pricey.
Any shops you know of that are decent in the area?
I like that I could dyno the engine once its built.
Gordonm & 73jst4fun, we'll have to get together for a cruise this summer
Any word on their engine building repuation? I've been looking for a good reputable, not expensive engine builder to build me a big block this winter. Every shop around Jersey is soooo darn pricey.
Any shops you know of that are decent in the area?
I like that I could dyno the engine once its built.
Gordonm & 73jst4fun, we'll have to get together for a cruise this summer
Thread Starter
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Awsome numbers....and rather close to me location wise.
Any word on their engine building repuation? I've been looking for a good reputable, not expensive engine builder to build me a big block this winter. Every shop around Jersey is soooo darn pricey.
Any shops you know of that are decent in the area?
I like that I could dyno the engine once its built.
Gordonm & 73jst4fun, we'll have to get together for a cruise this summer
Any word on their engine building repuation? I've been looking for a good reputable, not expensive engine builder to build me a big block this winter. Every shop around Jersey is soooo darn pricey.
Any shops you know of that are decent in the area?
I like that I could dyno the engine once its built.
Gordonm & 73jst4fun, we'll have to get together for a cruise this summer
There was no machine shop at this location but I have not seen the other location so I don't know about the engine building from them. The guy who did my machine work is a small shop down in S. Jersey called Withers automotive. Not much to look at but the shop is spotless and he is meticulous on his machine work. He has machined 4 motors for me and I keep coming back. He is reasonable pricing but his work is top notch.
Melting Slicks
Joined: Jan 2006
Posts: 3,028
Likes: 2
From: North NJ
There was no machine shop at this location but I have not seen the other location so I don't know about the engine building from them. The guy who did my machine work is a small shop down in S. Jersey called Withers automotive. Not much to look at but the shop is spotless and he is meticulous on his machine work. He has machined 4 motors for me and I keep coming back. He is reasonable pricing but his work is top notch.
4 Motors? I hope for 4 diff cars
This one looks like a keeper!
Thread Starter
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ