Will ported 305 heads be fine with LT1 intake?
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Joined: Jan 2003
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From: San Diego
Car: 1994 Trans Am
Engine: LT1
Transmission: Auto
Axle/Gears: 3.23
Will ported 305 heads be fine with LT1 intake?
My friend is selling his LT1 intake from his '95 Formula for $50. Not a bad price, right. Now the heads will become the next hinderance in flow correct? Will ported Lb9 heads be good and what cam should I go with?
Thanks, Kevin.
Thanks, Kevin.
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From: Savannah, GA
Car: 1997 Jeep Wrangler
Engine: 4.0L
Transmission: 5 speed
Axle/Gears: 8.8 rear, 4.56 gears, 4:1 transfer
I would use a L99 intake on your 305, not a LT1 intake. The smaller ports of the L99 intake should match the smaller ports of the heads and velocity should stay high for you. Just my opinion.
L99, LT1 and LT4 port compare pics
L99, LT1 and LT4 port compare pics
Joined: Jul 1999
Posts: 12,100
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From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Originally posted by John Millican
I would use a L99 intake on your 305, not a LT1 intake. The smaller ports of the L99 intake should match the smaller ports of the heads and velocity should stay high for you. Just my opinion.
L99, LT1 and LT4 port compare pics
I would use a L99 intake on your 305, not a LT1 intake. The smaller ports of the L99 intake should match the smaller ports of the heads and velocity should stay high for you. Just my opinion.
L99, LT1 and LT4 port compare pics
Trying to get an idea of different intake/head combinations.
-- Joe
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From: Savannah, GA
Car: 1997 Jeep Wrangler
Engine: 4.0L
Transmission: 5 speed
Axle/Gears: 8.8 rear, 4.56 gears, 4:1 transfer
Originally posted by anesthes
John, For my "stats book", whats your compression ratio, and hows that thing running in the 1/4 this year?
Trying to get an idea of different intake/head combinations.
-- Joe
John, For my "stats book", whats your compression ratio, and hows that thing running in the 1/4 this year?
Trying to get an idea of different intake/head combinations.
-- Joe
I havn't been to a 1/4 mile track in 3 years. The Camaro is also on Ebay right now.
Ebay link
Thread Starter
Supreme Member

Joined: Jan 2003
Posts: 2,043
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From: San Diego
Car: 1994 Trans Am
Engine: LT1
Transmission: Auto
Axle/Gears: 3.23
John, this is the part I'm still confused about. If I switch over to a 350 some day, I'll need the LT1 intake for it. Would you be willing to trade up at that point when I'm ready for the swap? Because I will be trading you soon for the L99 intake.
Also, have you ever dynoed the 2 intakes on the 305?
Thanks again John.
Also, have you ever dynoed the 2 intakes on the 305?
Thanks again John.
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From: Savannah, GA
Car: 1997 Jeep Wrangler
Engine: 4.0L
Transmission: 5 speed
Axle/Gears: 8.8 rear, 4.56 gears, 4:1 transfer
Sorry, I can't trade you a L99 for a LT1 intake. You can port match the L99 intake when it comes time for the 350.
I don't have access to a dyno in Savannah. Some of the board members may have dynoed a 305 with a LT1 intake though.
I don't have access to a dyno in Savannah. Some of the board members may have dynoed a 305 with a LT1 intake though.
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Joined: Jan 2003
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From: San Diego
Car: 1994 Trans Am
Engine: LT1
Transmission: Auto
Axle/Gears: 3.23
So let's say I go with the L99 intake, it will be good for stock heads. Would it still be good for ported Lb9 heads?
Now alot of guys, well most seem to be MAF Lb9's that have the peanut cam, since I am SD and have the L98 cam, would 1.6RR's be a nice upgrade and compliment the L99/Lt1 intake more than it would the TPI?
I've done a search so many times and different phrases, but no one has any dyno results or at least results with the mods I have planned. Most have crazy heads and cams and such.
This is all I have planned, anything over these mods and it becomes more hassle and headache than fun and worthwhile.
<L99/Lt1 intake, 2055 headers, 1.6RR's (some better springs as well), 3.42 or 3.73 gears.> After all that maybe a nice conv, vette servo, and shift kit and I'll call it a day.
I'm thinking I should be in the 230whp area with these mods.
Now alot of guys, well most seem to be MAF Lb9's that have the peanut cam, since I am SD and have the L98 cam, would 1.6RR's be a nice upgrade and compliment the L99/Lt1 intake more than it would the TPI?
I've done a search so many times and different phrases, but no one has any dyno results or at least results with the mods I have planned. Most have crazy heads and cams and such.
This is all I have planned, anything over these mods and it becomes more hassle and headache than fun and worthwhile.
<L99/Lt1 intake, 2055 headers, 1.6RR's (some better springs as well), 3.42 or 3.73 gears.> After all that maybe a nice conv, vette servo, and shift kit and I'll call it a day.
I'm thinking I should be in the 230whp area with these mods.
Joined: Jan 2005
Posts: 10,450
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From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
The 305 heads have the same port size as the 350!!! Why would it not work to stick the LT1 intake on them.
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