94 LT1 Exhaust question.
Thread Starter
Intermediate
Joined: Mar 2011
Posts: 36
Likes: 0
From: Enterprise Alabama
Ok awesome. I am rebuilding my LT1 and got headers I am worrying about the back pressure thats all. I am wondering how much of a difference taking the cats off will have on my HP.
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
The LT1/4/5 cats flow extremely well. Unless you are going big...500+, you might see a 5hp improvement.
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Thread Starter
Intermediate
Joined: Mar 2011
Posts: 36
Likes: 0
From: Enterprise Alabama
Stock block I am not boring it, LT4 intake with a bored 54mm throttle body, Pacesetter headers, A new cam not sure the specs on it! I will get the specs and put on here later. The heads are being ported and polished at the machine shop. Ummm new pistons just a stock rebuild kit. Cold air intake.
Race Director
Joined: Jan 2002
Posts: 12,263
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From: O'Fallon Missouri
My understanding is the LT4 intake has the same port location and dimensions as the LT1 intake. That being said if it was port matched to an LT1 head it might work. The LT4 head has a taller ceiling of the port, if the intake was matched to an LT4 head it won't work.
Maybe Jim "96GS#007" will chime back in. I'm sure he knows the answer.
Maybe Jim "96GS#007" will chime back in. I'm sure he knows the answer.
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
You need to slow down and plan what you want to do before buying a bunch of parts.
Regarding the intake...
- Is it a GM LT4 intake (verified by looking at the p/n) or one of the Edelbrock LT4 intakes?
- Do you have a pic you can post?
- What type of port work has been done?
- Have you laid one of you old LT1 intake gaskets on the intake to see if the ports align?
"Ready, Fire!, Aim" is never a good approach and you're at risk that you're going to p!ss away a lot of money as a result.
Regarding the intake...
- Is it a GM LT4 intake (verified by looking at the p/n) or one of the Edelbrock LT4 intakes?
- Do you have a pic you can post?
- What type of port work has been done?
- Have you laid one of you old LT1 intake gaskets on the intake to see if the ports align?
"Ready, Fire!, Aim" is never a good approach and you're at risk that you're going to p!ss away a lot of money as a result.
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
In addition, why in the world would you "cut them off" when they are bolt on? Unbolt them from the factory manifolds and add replacement pipes. Sell the cats for a few hundred dollars to help fund the rebuild.