Questionable results from mods
Thread Starter
7th Gear
Joined: Jul 2009
Posts: 7
Likes: 0
From: Plantation fl
Questionable results from mods
I just bought my first vette about 2 months ago. It is a 94 6 speed with 40K original miles. At 34,704 miles the previous owner had the engine rebuilt with the following:
383 eagle stroker assembly, ported and polished heads and manifold, hot cam, and 1.6 rr
The owner supplied all paperwork for the parts and labor and included a dyno printout. The printout shows max hp as 313 and max tq as 339.
I love the car as it is incredibly clean but the power seems low for the mods. What do you guys think????
383 eagle stroker assembly, ported and polished heads and manifold, hot cam, and 1.6 rr
The owner supplied all paperwork for the parts and labor and included a dyno printout. The printout shows max hp as 313 and max tq as 339.
I love the car as it is incredibly clean but the power seems low for the mods. What do you guys think????
Le Mans Master
Joined: Mar 2002
Posts: 5,889
Likes: 2
From: Castro Valley Calif.
St. Jude Donor '03 thru '26
That sounds very low...........I wonder if he pulled a fast one? And then, how could you tell the bore/stroke without opening it up?
Maybe he just did the cam & rockers?
Maybe he just did the cam & rockers?
Thread Starter
7th Gear
Joined: Jul 2009
Posts: 7
Likes: 0
From: Plantation fl
It is at the wheels. Guess he could have pulled a fast one. But it sure seems like a lot of paperwork. I got invoices from Summit and from the shop showing vin numbers. Maybe poor tuning or no tuning.
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Race Director
Joined: Jan 2005
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From: Slidell Louisiana
What type of dyno? (mustangs generally are more stingy than dynojets)
How high did they spin it? (revs are your friend on a dyno)
Does it have heavy rear wheels (car with heavy wheels will dyno lower than same car with lighter wheels)
Supporting mods? Headers/exhaust/ported intake etc
IMO you will never see 450 RWHP, 383 and hotcam in the same sentence.
Most importantly top end makes most of the power (heads/cam/intake etc) so a 383 with same mediocre top end may not make any more HP than a 350 the difference will be that the power will be made at a lower RPM
....and if many times ported (modified) heads are installed on a short block built by a normal SBC guy engine end up with less compression than stock due to a larger combustion chamber. LT1s love compression. (mines a RCH more than 12 to one and runs on pump gas without detonation or knock retard)
How high did they spin it? (revs are your friend on a dyno)
Does it have heavy rear wheels (car with heavy wheels will dyno lower than same car with lighter wheels)
Supporting mods? Headers/exhaust/ported intake etc
IMO you will never see 450 RWHP, 383 and hotcam in the same sentence.
Most importantly top end makes most of the power (heads/cam/intake etc) so a 383 with same mediocre top end may not make any more HP than a 350 the difference will be that the power will be made at a lower RPM
....and if many times ported (modified) heads are installed on a short block built by a normal SBC guy engine end up with less compression than stock due to a larger combustion chamber. LT1s love compression. (mines a RCH more than 12 to one and runs on pump gas without detonation or knock retard)
Team Owner
Joined: Aug 2005
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From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
What are your heads specifications?
Valves Duration for Intake___, Exhaust___
Lift:___
CC:___
Flow:___
CFM:___
Cam:_________
Did you get the Vette tuned for a 383?
Valves Duration for Intake___, Exhaust___
Lift:___
CC:___
Flow:___
CFM:___
Cam:_________
Did you get the Vette tuned for a 383?
Thread Starter
7th Gear
Joined: Jul 2009
Posts: 7
Likes: 0
From: Plantation fl
Here are the answers I have. As stated earlier, I bought the car as is. I have not done anything to it.
I don't know the extent of headwork done, but I am pretty sure it was minor and the valves were left stock.
Peak tq occured at about 3500 rpm and peak hp at about 5750 rpm. I don't know what kind of dyno it was on.
The exhaust is all stock from the manifolds to the tail pipes.
I know it should be higher so I was either lied to or some shop just slapped parts together.
Should I maybe get it tuned.????
I don't know the extent of headwork done, but I am pretty sure it was minor and the valves were left stock.
Peak tq occured at about 3500 rpm and peak hp at about 5750 rpm. I don't know what kind of dyno it was on.
The exhaust is all stock from the manifolds to the tail pipes.
I know it should be higher so I was either lied to or some shop just slapped parts together.
Should I maybe get it tuned.????
Le Mans Master
Joined: Jul 2000
Posts: 5,012
Likes: 5
From: OKC OK
What type of dyno? (mustangs generally are more stingy than dynojets)
How high did they spin it? (revs are your friend on a dyno)
Does it have heavy rear wheels (car with heavy wheels will dyno lower than same car with lighter wheels)
Supporting mods? Headers/exhaust/ported intake etc
IMO you will never see 450 RWHP, 383 and hotcam in the same sentence.
Most importantly top end makes most of the power (heads/cam/intake etc) so a 383 with same mediocre top end may not make any more HP than a 350 the difference will be that the power will be made at a lower RPM
....and if many times ported (modified) heads are installed on a short block built by a normal SBC guy engine end up with less compression than stock due to a larger combustion chamber. LT1s love compression. (mines a RCH more than 12 to one and runs on pump gas without detonation or knock retard)
How high did they spin it? (revs are your friend on a dyno)
Does it have heavy rear wheels (car with heavy wheels will dyno lower than same car with lighter wheels)
Supporting mods? Headers/exhaust/ported intake etc
IMO you will never see 450 RWHP, 383 and hotcam in the same sentence.
Most importantly top end makes most of the power (heads/cam/intake etc) so a 383 with same mediocre top end may not make any more HP than a 350 the difference will be that the power will be made at a lower RPM
....and if many times ported (modified) heads are installed on a short block built by a normal SBC guy engine end up with less compression than stock due to a larger combustion chamber. LT1s love compression. (mines a RCH more than 12 to one and runs on pump gas without detonation or knock retard)
Thread Starter
7th Gear
Joined: Jul 2009
Posts: 7
Likes: 0
From: Plantation fl
Maybe it was vettemed's car. I only know by his real name as I bought it locally and not through the forum. The real question is what to do next.
Tune, cam, ported intake, or exhaust?
I know all 4 should be done but having a desire to stay happily married things need to be spaced out.
Tune, cam, ported intake, or exhaust?
I know all 4 should be done but having a desire to stay happily married things need to be spaced out.
