1979 L48 cam/intake
Thread Starter
Instructor
Joined: Jun 2018
Posts: 108
Likes: 17
From: Blue springs mo.
1979 L48 cam/intake
Hello all. I’m getting overwhelmed here. This winter project will be intake cam efi and port stock heads.
getting Holley sniper 4150 efi
getting 1982 fuel sending unit for tank and a walbro255 pump for tank.
changing fuel lines to 3/8”
need advice on intake Duel plane yes.
which one for a stock hood?????
would like to get comp thumper cam
which one. ??? Middle range.
I am not raceing just weekend shows and lots of burn outs. Lolol.
could use part numbers please. Some help.
thanks.
getting Holley sniper 4150 efi
getting 1982 fuel sending unit for tank and a walbro255 pump for tank.
changing fuel lines to 3/8”
need advice on intake Duel plane yes.
which one for a stock hood?????
would like to get comp thumper cam
which one. ??? Middle range.
I am not raceing just weekend shows and lots of burn outs. Lolol.
could use part numbers please. Some help.
thanks.
Race Director
Joined: Nov 2006
Posts: 13,248
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From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
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Cruise-In VIII Veteran
I have a fair bit of experience with EFI on my 77. been quite a learning curve. I ran a thread about 2 years ago. "77 EFI conversion". You might wish to google it. I know our gas tanks are different, but everything else is the same.
I am in the process of switching out my duel plane manifold for a single plane. Hoping to cure the last little tuning bugs.
If you haven't purchased a manifold yet. would highly recommend you look at a single plane.
As per porting the stock heads. Complete waste of time and money. look at some budget alloy heads. You will be way ahead. Stock heads are garbage that are prone to cracking and have combustion chambers that are way to big.
As per Cam. once you get an idea which heads, head gasket, etc. you will be running. then we can give more advice. Keeping in mind those L48 dished pistons are going to be a limiting factor.
I am in the process of switching out my duel plane manifold for a single plane. Hoping to cure the last little tuning bugs.
If you haven't purchased a manifold yet. would highly recommend you look at a single plane.
As per porting the stock heads. Complete waste of time and money. look at some budget alloy heads. You will be way ahead. Stock heads are garbage that are prone to cracking and have combustion chambers that are way to big.
As per Cam. once you get an idea which heads, head gasket, etc. you will be running. then we can give more advice. Keeping in mind those L48 dished pistons are going to be a limiting factor.
Thread Starter
Instructor
Joined: Jun 2018
Posts: 108
Likes: 17
From: Blue springs mo.
1979 l48 cam/intake
I have a fair bit of experience with EFI on my 77. been quite a learning curve. I ran a thread about 2 years ago. "77 EFI conversion". You might wish to google it. I know our gas tanks are different, but everything else is the same.
I am in the process of switching out my duel plane manifold for a single plane. Hoping to cure the last little tuning bugs.
If you haven't purchased a manifold yet. would highly recommend you look at a single plane.
As per porting the stock heads. Complete waste of time and money. look at some budget alloy heads. You will be way ahead. Stock heads are garbage that are prone to cracking and have combustion chambers that are way to big.
As per Cam. once you get an idea which heads, head gasket, etc. you will be running. then we can give more advice. Keeping in mind those L48 dished pistons are going to be a limiting factor.
I am in the process of switching out my duel plane manifold for a single plane. Hoping to cure the last little tuning bugs.
If you haven't purchased a manifold yet. would highly recommend you look at a single plane.
As per porting the stock heads. Complete waste of time and money. look at some budget alloy heads. You will be way ahead. Stock heads are garbage that are prone to cracking and have combustion chambers that are way to big.
As per Cam. once you get an idea which heads, head gasket, etc. you will be running. then we can give more advice. Keeping in mind those L48 dished pistons are going to be a limiting factor.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Not a fan of those cams, lots out there that will perform and still sound good. Same with bootlegger or names that draw kids in
Too much overlap for thier size youre blowing all your torque right out the exhaust.
Too much overlap for thier size youre blowing all your torque right out the exhaust.
Last edited by cv67; Oct 10, 2021 at 11:46 AM.
Pro
Joined: Jul 2021
Posts: 719
Likes: 156
Pro
Joined: Jul 2021
Posts: 719
Likes: 156
And here's a Very Low Profile (3.575") single plane, square bore intake ... Weiand 7547-1 ... in stock ... $213
https://www.summitracing.com/parts/w...make/chevrolet
https://www.summitracing.com/parts/w...make/chevrolet
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Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
Stay away from Thumper cams, especially with EFI.....the late exhaust closing will cause issues with tuning.....A/F, and vacuum overall......
The 7530 Team G will fit under the stock hood and would be the way I would go.......the 7547-1 mentioned above would work well too.....I would use a 1/2" spacer with it (wood phenolic)......
The Performer RPM fits under a 79' hood.....with a dropped base air cleaner....but the Sniper may be too fat for it to clear.....the RPM had the divider milled....and would work well with EFI.
Jebby
The 7530 Team G will fit under the stock hood and would be the way I would go.......the 7547-1 mentioned above would work well too.....I would use a 1/2" spacer with it (wood phenolic)......
The Performer RPM fits under a 79' hood.....with a dropped base air cleaner....but the Sniper may be too fat for it to clear.....the RPM had the divider milled....and would work well with EFI.
Jebby
Melting Slicks
Joined: Aug 2003
Posts: 3,416
Likes: 291
From: dayton oh
OR you could save BIG $$$ on the TFS and find some alum Vette L98 heads (58cc) but they wont want to rev past 5000-5500. I scored some for $50 off CL for a budget L48 project i'm building
Last edited by Fast81; Oct 12, 2021 at 08:43 PM.