Intake and carb upgrade
Thread Starter
Instructor
Joined: May 2015
Posts: 135
Likes: 8
Intake and carb upgrade
How much performance should I see going from an Edelbrock performer (non rpm) and a holley 750 vacuum secondaries to a edelbrock scorpion intake and a holley 750 double pumper. I have them lying around just need to rebuild the holley wondering if it'd be worth it to swap the carb and intake
current engine specs
SBC 400 bored over to a 406
291 heads with screw in studs and 1.6 rockers
Crane cam .449/.449 lift with .222 duration
Dished pistons
Hedman headers
Edelbrock performer intake manifold
Holley 750 vacuum secondaries carb
current engine specs
SBC 400 bored over to a 406
291 heads with screw in studs and 1.6 rockers
Crane cam .449/.449 lift with .222 duration
Dished pistons
Hedman headers
Edelbrock performer intake manifold
Holley 750 vacuum secondaries carb
Melting Slicks
Joined: Apr 2009
Posts: 2,632
Likes: 112
From: Great Plains Iowa
I'd bet you would lose a lot of the low end torque that you want from a street manifold and carburetor and the 750 mechanical secondary Holley is a track racing carburetor that was never intended for street use. I'd stay with your present manifold and carburetor because they're a better match for your engine.
Race Director
Joined: Jan 2000
Posts: 13,015
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From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
2020 Corvette of the Year (performance mods)
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The heads are holding you back more than anything..along with the cam. 406" could use some airflow.
The 750DP can work excellent on the street...but depending on what you've got for gears, trans, converter(?) what you have might not be hurting much based on what's between the pistons and the air filter. You've got a lot of restriction with those heads/intake/cam.
JIM
The 750DP can work excellent on the street...but depending on what you've got for gears, trans, converter(?) what you have might not be hurting much based on what's between the pistons and the air filter. You've got a lot of restriction with those heads/intake/cam.
JIM
Thread Starter
Instructor
Joined: May 2015
Posts: 135
Likes: 8
The heads are holding you back more than anything..along with the cam. 406" could use some airflow.
The 750DP can work excellent on the street...but depending on what you've got for gears, trans, converter(?) what you have might not be hurting much based on what's between the pistons and the air filter. You've got a lot of restriction with those heads/intake/cam.
JIM
The 750DP can work excellent on the street...but depending on what you've got for gears, trans, converter(?) what you have might not be hurting much based on what's between the pistons and the air filter. You've got a lot of restriction with those heads/intake/cam.
JIM
So .582 lift respectively with 1.6 rockers
Race Director
Joined: Jan 2000
Posts: 13,015
Likes: 2,260
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
Tell us more about the whole combo and what your plans are for it. What pistons? Cast or forged? Stock rods or aftermarket? Crank?
Some real heads will wake it up...but cam choice needs to come after heads are picked.
JIM
Some real heads will wake it up...but cam choice needs to come after heads are picked.
JIM
