Please help with my 383 build up
Thread Starter
Burning Brakes
Joined: Dec 2001
Posts: 901
Likes: 15
From: Punta Gorda, FL
Please help with my 383 build up
The LT1 383 for my '95 is under construction. The basics are: ported LT1 heads with bigger valves, GM Hot Cam, shorty headers with stock cats, Borla catback, stock 3.45 gears, 52 mm TB, custom programing. Hoping to reach 425 fwhp.
1) Does the stock MAF need to be changed?
2) Do I need a replacement or anciliary fuel pump?
3) Do I need to change to LT4 fuel rails?
4) What size fuel injectors do you recommend?
4) What plugs do you recommend?
5) Any other advice?
Any and all opinions appreciated.
1) Does the stock MAF need to be changed?
2) Do I need a replacement or anciliary fuel pump?
3) Do I need to change to LT4 fuel rails?
4) What size fuel injectors do you recommend?
4) What plugs do you recommend?
5) Any other advice?
Any and all opinions appreciated.
Team Owner
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: Please help with my 383 build up (lspalding)
You shouldnt need to change the MAF, not with the Hotcam, the MAF is good to the ~500hp range before youd need to consider changing to MAP.
Stock pump should be fine, standard injectors for a 383 are #30s.
Stock pump should be fine, standard injectors for a 383 are #30s.
Le Mans Master
Joined: Apr 2001
Posts: 7,411
Likes: 253
From: Little Elm TX
Re: Please help with my 383 build up (lspalding)
The LT1 383 for my '95 is under construction. The basics are: ported LT1 heads with bigger valves, GM Hot Cam, shorty headers with stock cats, Borla catback, stock 3.45 gears, 52 mm TB, custom programing. Hoping to reach 425 fwhp.
1) Does the stock MAF need to be changed?
2) Do I need a replacement or anciliary fuel pump?
3) Do I need to change to LT4 fuel rails?
4) What size fuel injectors do you recommend?
4) What plugs do you recommend?
5) Any other advice?
Any and all opinions appreciated.
1) Does the stock MAF need to be changed?
2) Do I need a replacement or anciliary fuel pump?
3) Do I need to change to LT4 fuel rails?
4) What size fuel injectors do you recommend?
4) What plugs do you recommend?
5) Any other advice?
Any and all opinions appreciated.
1. I still run the stock MAF less screen.
2. Still have stock fuel pump but will be going to Walbro when I can.
3. Still have stock fuel rails and don't see they need to be changed.
4. 30lbs. SVO (about $600 cheaper than GM)
4. (again? :jester ) I run NGK TR55's at .035 now. May change to AutoLite 103 or 104's next.
5. Prefer a 7 quart pan and High Volume oil pump. I've got the Canton race pan.
I don't know your exact plans on the heads, but if your going to the Hot cam, you'll need new springs and will probably want to get 1.6 roller rockers as well. I'd suggest if you're you going with a custom head, to get a cam to match. If you're just cleaning them up (like I did) then the Hot cam is fine.
