Getting the Carb Tuned
Thread Starter
Instructor
Joined: Mar 2020
Posts: 167
Likes: 42
From: Virginia
Burning Brakes
Joined: Oct 2012
Posts: 1,152
Likes: 252
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
The answer to that is a solid “maybe”. It depends on how old the current gaskets are and what material they’re made of. It would be good to have them on hand, cuz the only real way to find out is to pull the valve cover. Do you know whether they’re aluminum or iron? A magnet will tell you that quickly.
Thread Starter
Instructor
Joined: Mar 2020
Posts: 167
Likes: 42
From: Virginia
The answer to that is a solid “maybe”. It depends on how old the current gaskets are and what material they’re made of. It would be good to have them on hand, cuz the only real way to find out is to pull the valve cover. Do you know whether they’re aluminum or iron? A magnet will tell you that quickly.
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
I did a little bit of research, and I can say that they're not AFR, TFS, Edelbrock and I don't think they're GM heads. My best guess is ProComp, but not 100% sure.
AFR, TFS, Edelbrock have branding and model #s milled into that surface, GM seems to have slightly different patterns from what I can see, and some look like they've got some stamping in at any rate.
AFR, TFS, Edelbrock have branding and model #s milled into that surface, GM seems to have slightly different patterns from what I can see, and some look like they've got some stamping in at any rate.
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,171
From: Hermosa
Looks like Stock manifolds. Those could account for lower dyno. Numbers even with decent aftermarket parts. Chokes the exhaust pretty badly.
go here:
https://www.compcams.com/xe284h
notice your torque is perhaps in line with the dyno numbers but your way down on HP. Given you have an air gap intake I would not say the intake is responsible for that. But with those manifolds I would say a high probability that they are.
this is assuming you actually have this cam.
I tend to believe you don’t, given at what rpm max torque And HP was met vs the dyno chart. In either case if it were mine I’d ditch the cast iron manifolds if I wanted more HP .
go here:
https://www.compcams.com/xe284h
notice your torque is perhaps in line with the dyno numbers but your way down on HP. Given you have an air gap intake I would not say the intake is responsible for that. But with those manifolds I would say a high probability that they are.
this is assuming you actually have this cam.
I tend to believe you don’t, given at what rpm max torque And HP was met vs the dyno chart. In either case if it were mine I’d ditch the cast iron manifolds if I wanted more HP .
Last edited by REELAV8R; Sep 27, 2020 at 01:47 PM.
Thread Starter
Instructor
Joined: Mar 2020
Posts: 167
Likes: 42
From: Virginia
Looks like Stock manifolds. Those could account for lower dyno. Numbers even with decent aftermarket parts. Chokes the exhaust pretty badly.
go here:
https://www.compcams.com/xe284h
notice your torque is perhaps in line with the dyno numbers but your way down on HP. Given you have an air gap intake I would not say the intake is responsible for that. But with those manifolds I would say a high probability that they are.
this is assuming you actually have this cam.
I tend to believe you don’t, given at what rpm max torque And HP was met vs the dyno chart. In either case if it were mine I’d ditch the cast iron manifolds if I wanted more HP .
go here:
https://www.compcams.com/xe284h
notice your torque is perhaps in line with the dyno numbers but your way down on HP. Given you have an air gap intake I would not say the intake is responsible for that. But with those manifolds I would say a high probability that they are.
this is assuming you actually have this cam.
I tend to believe you don’t, given at what rpm max torque And HP was met vs the dyno chart. In either case if it were mine I’d ditch the cast iron manifolds if I wanted more HP .
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Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,171
From: Hermosa
.
http://www.superchevy.com/how-to/491...power-increase
also do a search here in the forum for headers, you’ll get all the reading on that subject you can take.
do some google searches as well, there is a ton of info on headers, primary sizes and lengths ( block huggers, shorties and long tube)
I personally lean towards long tube headers for upper rpm gains.
http://www.superchevy.com/how-to/491...power-increase
also do a search here in the forum for headers, you’ll get all the reading on that subject you can take.
do some google searches as well, there is a ton of info on headers, primary sizes and lengths ( block huggers, shorties and long tube)
I personally lean towards long tube headers for upper rpm gains.
Last edited by REELAV8R; Sep 27, 2020 at 02:53 PM.
Thread Starter
Instructor
Joined: Mar 2020
Posts: 167
Likes: 42
From: Virginia
.
http://www.superchevy.com/how-to/491...power-increase
also do a search here in the forum for headers, you’ll get all the reading on that subject you can take.
do some google searches as well, there is a ton of info on headers, primary sizes and lengths ( block huggers, shorties and long tube)
I personally lean towards long tube headers for upper rpm gains.
http://www.superchevy.com/how-to/491...power-increase
also do a search here in the forum for headers, you’ll get all the reading on that subject you can take.
do some google searches as well, there is a ton of info on headers, primary sizes and lengths ( block huggers, shorties and long tube)
I personally lean towards long tube headers for upper rpm gains.
Would the grade fuel affect the HP? I run Shell 93 octane through it because the previous owner said he only runs that in his cars. I read through an old thread on here about how fuel grade does not actually affect how clean the engine runs and doesn't help with power. If that is true I'm gonna drop down to a lower grade because gas at Sam's Club is so much cheaper than the one Shell station I have nearby.
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
Thank you for the info. I'm gonna read up on it but it will be a while before I can sneak new headers into the garage without my wife knowing.
Would the grade fuel affect the HP? I run Shell 93 octane through it because the previous owner said he only runs that in his cars. I read through an old thread on here about how fuel grade does not actually affect how clean the engine runs and doesn't help with power. If that is true I'm gonna drop down to a lower grade because gas at Sam's Club is so much cheaper than the one Shell station I have nearby.
Would the grade fuel affect the HP? I run Shell 93 octane through it because the previous owner said he only runs that in his cars. I read through an old thread on here about how fuel grade does not actually affect how clean the engine runs and doesn't help with power. If that is true I'm gonna drop down to a lower grade because gas at Sam's Club is so much cheaper than the one Shell station I have nearby.
As for fuel, as long as you're not pinging and you can run maximum timing for performance, you'd see no difference with better fuel.
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,171
From: Hermosa
The problem you may encounter with Sam's club fuel has ethanol in the fuel. Your vette will run the ethanol but the fuel lines are likely not be ethanol resistant, ethanol requires a richer mixture so carb re-jetting may be required. Give it a shot, most guys are too rich already so you may not have to do anything. fuel lines will slowly degrade internally from the ethanol in the fuel.