First off, I unfortunately don't have pics of the work in progress but I will have pics of it in the car when I get it running. They wouldn't really look any different than the pics of John's and RCR's page anyways. Well the intake is completely done and bolted onto the fastburn heads. Everything went fairly smootly and I didn't run into many surprises thankfully. Modding the intake to fit was exactly like what John has done with the LT1 intake. The only extra work I had to do was match the ports on the LT4 intake to the ports on the Fast Bun heads. And when I say "extra", it doesn't mean much. The Fast Burn ports are HUGE. The LT4 ports aren't quite as big, but they're still a good bit taller than the ports on the old TPI intake. The bottom of the ports matched perfectly with the ports on the Fast Burns. The only work needed to be done was gasket matching the top of the LT4 intake ports. I ended up having to remove about .10" of material on the intake. The heads needed no work to match up (a huge relief). I did however remove a bit of the casting flash in the heads. The gaskets I used were FelPro 1255 "Vortec" style gaskets. These have the tall (much taller than a standard gasket) ports for the Fast Burn heads and they have both the Vortec and standard bolt pattern in them. These gaskets made the job ALOT easier. As of right now, the motor is sitting in the car with the intake installed. The only thing that's keeping me from firing it up is the lack of fuel rails. They're on there way from a guy in Canada (they also have an Aeromotive adjustable regulator) and won't be here until next week. Hopefully I'll have the car running by next weekend. I still have to break in the new motor at the same time. For those who are wondering, the motor consists of a ZZ4 shortblock, LT4 Hot cam, 1.6 roller rockers and the Fast Burn heads. I still need to get a custom prom burned for the new setup to make it run right. I'll probably go to Ed Wright for that because I have no clue how to burn my own proms and don't have the time to learn any time soon. I can't wait to get this thing running. the anticipation is killing me.

 

I'm gonna have to follow this thread. I've been planning on a super-ram/miniram & AFR 190 combo. This looks cheaper.

I wonder how it would compare to the LT4 intake on top of a set of AFRs. The Fastburns really aren't much cheaper than the AFRs.

 

Well the thing about the Fast Burns is that they are raised runner Vortec style heads. The ports are taller and positioned slightly higher than standard heads like the AFRs. When the LT4 was designed, it also incorporated the raised runner style. So it's possible that an LT4 intake would take alot more work to match to the ports of a standard head.

 

To let everyone know I emailed AFR to know if any of there standard heads will work with an LT4 intake and they told me that the LT4 intake ports will align with there AFR 195 ports

 

Hey IRACE87, nice username. Irace is my last name.

 

It would be rad if you got custom license plates.. On those two cars you could put:

IRACE 01
IRACE 02

 

My Grandmother said the same thing. I thought about it, but having "I RACE" on shiny sports cars just seemed like an open invitation to get pulled over on a daily basis.

 

What about the LT1 manifolds? Want to venture a guess as to whether or not the fastbruns would work? Thanks.


Adam

 

The lt1 will not work on the fast burns or vortec their just isnt enough meat on the top side of the intake ports to cut a whay and port mach to the heads I started to do this same convertion and then i ran in to cash problems and stoped but I do have an lt1 intake with fuel rails that I will use for part for the lt4 intake if I do ever get a chance to do it.

 

lol I just posted to the Power Adder Forum about LT1 intake/vortec heads....DUH!

 

When I put a standard gasket up to the Fast Burn ports, it's obvious why an LT1 intake won't work with them (This is assuming that the LT1 ports are in the same spot as a standard sbc intake---which I believe I remember seeing John Millican say that). You have to think of it this way: It's not so much the size of the ports, it's the location of them. On an LT1 intake, there would not be enough material to completely cover the port on a Fast Burn head. On the LT4 intake however, the ports are located slightly higher, thus making them the way to go for a Fast Burn head. I only had to remove about .1" of material from the top of the ports on the LT4 intake to make them match the Fast Burns. The bottom of the ports lined up practically perfect. Now for those of you who are considering doing this with the iron Vortec heads, you'll have to get them drilled with the standard bolt pattern. the Fast Burns come predrilled with both bolt patterns. I really wish I had taken pictures of this to show exactly what I'm talking about. What you could do is buy a set of standard sbc gaskets and compare them to a FelPro 1255. This is the gasket I used and it has the Fast Burn ports with both bolt patterns on it. Let me know if you have anymore specific questions and I'll try to answer them as best I can.

Stephen

 

That what I found when I mesured every thing up. I found that the lt4 was almoct .1 larger then the standerd heads and the fast burns are .2 larger if you take the .2 from a lt1 intake their is nothing left.

 

Steve,
How much material was left at the top of the ports on the intake ? Any concern with vaccum leaks ?

 

There was plenty of material left on the intake. I could've taken even more off and it would still be fine.