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A couple of experiences I’ve had:
First, with a 78 Thunderbird 351M 2bbl. I put on an Edelbrock 4bbl manifold so I could install a Holley 4bbl. I spent lots of money to gain nothing.
On a 1983 Grand Prix with the 5.0 Chevy V8 I installed Heddman Hedders and a dual exhaust. I swapped out the electronically controlled Qjet for an older Qjet and also swapped the computer controlled HEI distributer for an older vacuum controlled HEI distributer. Once I found the right timing for this setup, the car was completely different. This car was a bit of a slug before the work. But, it really moved afterwards.
If your manifold is cracking, you’re probably having problems already. A vacuum leak causes lots of problems. If you’re just wanting to replace it, it’s your money, but you won’t gain anything from it.
A couple of experiences I’ve had:
First, with a 78 Thunderbird 351M 2bbl. I put on an Edelbrock 4bbl manifold so I could install a Holley 4bbl. I spent lots of money to gain nothing.
On a 1983 Grand Prix with the 5.0 Chevy V8 I installed Heddman Hedders and a dual exhaust. I swapped out the electronically controlled Qjet for an older Qjet and also swapped the computer controlled HEI distributer for an older vacuum controlled HEI distributer. Once I found the right timing for this setup, the car was completely different. This car was a bit of a slug before the work. But, it really moved afterwards.
If your manifold is cracking, you’re probably having problems already. A vacuum leak causes lots of problems. If you’re just wanting to replace it, it’s your money, but you won’t gain anything from it.
I really don’t think the air intake plans you have will help anything. I’ve seen side by side comparisons and changing the air intake did not make a measurable difference. If you use bigger injectors you will run rich unless the PCM is reprogrammed to inject less fuel. Therefore, the bigger injectors will not give a benefit unless you add forced induction to bring in more air.
I’m thinking a complete change of plans would bring more benefit. Headers and a free flowing exhaust pipes will allow more timing advance. A bigger cam will increase power, but this is a commitment to a lot of work to install. Both of these will require a PCM retune.
Installing new plugs, wires, and coils will help if the old parts are worn. However, these cars came with a very effecient ignition system that does the job quite well. Spending money on “High Performance” brands will just be money that you don’t have anymore.
The L67 engine is a very good engine. I have one with 134000 miles and it still runs strong and clean. Although it requires a little more money at the pump, it makes up for it withd 35mpg on the highway. But, the choice is yours.
I really don’t think the air intake plans you have will help anything. I’ve seen side by side comparisons and changing the air intake did not make a measurable difference. If you use bigger injectors you will run rich unless the PCM is reprogrammed to inject less fuel. Therefore, the bigger injectors will not give a benefit unless you add forced induction to bring in more air.
I’m thinking a complete change of plans would bring more benefit. Headers and a free flowing exhaust pipes will allow more timing advance. A bigger cam will increase power, but this is a commitment to a lot of work to install. Both of these will require a PCM retune.
Installing new plugs, wires, and coils will help if the old parts are worn. However, these cars came with a very effecient ignition system that does the job quite well. Spending money on “High Performance” brands will just be money that you don’t have anymore.
The L67 engine is a very good engine. I have one with 134000 miles and it still runs strong and clean. Although it requires a little more money at the pump, it makes up for it withd 35mpg on the highway. But, the choice is yours.
I added a high flow, reusable stock replacement air filter. I then got some cheap insulation wrap and covered the plumbing from the air box to the throttle body. No way for me to have numbers, but it felt like there was a little something more.
A stock air system is already designed to bring in air from outside the engine bay. This is going to have cooler air than most of the $300 CAI kits I’ve seen that will suck in the hotter air from the engine bay.
I added a high flow, reusable stock replacement air filter. I then got some cheap insulation wrap and covered the plumbing from the air box to the throttle body. No way for me to have numbers, but it felt like there was a little something more.
A stock air system is already designed to bring in air from outside the engine bay. This is going to have cooler air than most of the $300 CAI kits I’ve seen that will suck in the hotter air from the engine bay.