I am working on a sbc 406 and putting on modified vortec heads. I am thinking about running a FI setup. I may have access to the upper half of an LS1. It looks like the intake bolt patterns are the same and I think after 93(?) they started using the 8 bolt intake. Correct?

But my questions are: will it fit, are the vortec heads or the LS1 heads better, and is there any special work that has to be done to make it work? that is other than wiring and changing computers. Any machine work that needs to be done? How do I run plug wires and ignition system? The system is off a '01 SS and it uses the independent ignition coils. So is it possible and how much work is it?

Thanks in advance for any input.

 

The LS1 intake will not work at all. I cant think of anyway for it work. If you get a different set of heads you can use the lt1 intake with out too much work. ls1s started in 98 also.

 

Theres absolutely no way you can put an LS1 intake on any SBC head. Ports dont line up at all, not even remotely close.

 

Even if you got around the ports which you can't, the LS1 intake is something like a 15° and stock SBC is 23°. Angle is WAY off.

 

If I can get the intake, the heads will be available also. Will the heads fit the older sbc? And if it could, which would be better anyway, the modified LS1 heads and intake or the vortec heads and a performer rpm (carb) intake?

I have not looked at the pieces when they are off of the motor so I have no idea how everything lines up. Do the waterjackets line up or are they reverse flow or anything that would not work? And for any comparrison, I could probally get the entire setup for about the same cost as the vortec stuff.

So is it at all possible? If not, its no big deal, but like I said I havent looked at all the ports, bolt patterns, etc. So I come here and ask you guys.

 

Oh yeah, John, you say the angles are way off. What angles are you referring to. That is only the valve angles correct?

 

Nothing from an LS1 fits an older SBC, they are not even remotely related, other than being a V-8 internal combustion engine, all similarities stop there.

 

Hmm... well I wont say no they wont fit but I will tell you the head bolt holes dont line up at all. Not to mention your camshaft will not work with those heads and it'll cost a minimum of $700 to have one made. As an idea, forget it. It'll save you money.

 

The valve angles are different, but that doesnt matter. The intake manifold faces on the head arent 90 to the block like a SBC is.

 

ls1 heads wont work on a sbc block. coolant passages arent in the same spots and im sure bolt holes dont line up. plus a i think the bore of an ls1 is different than a sbc 350, but thats the least of worries.

 

The only item that DOES interchange are the connecting rods. EVERYTHING else is totally re-designed by GM.

The LS1 will be THE V-8 engine to have for the next 20 years though, just like the orginal SBC. IMHO.

 

The bore is smaller on the LS1, but that doesnt matter much. The bore spacing is identical.

 

hmm, exactly what i said, least of worries

 

Nada they were made in 97 in the Vette, 98 in the Fbodys.


This is a totally differnt Engine

up to 92 SBC is a 1st Gen
93-97 SBC is a 2nd Gen
98-02 SBC is a 3rd GEn

 

Thats cool. Thanks for the input. I am now more educated. I am glad we have a board to come to and can ask the stupidest of questions and someone if not everyone will try to help. I appreciate all the feedback. Guess that idea was a wash, though.

:hail: Thirdgen and all the cool folks participating.

 

Keep in mind, the `93-`02 trucks still got Gen I SBC's & passenger cars still got Gen I SBC`s in '93. I don't know if any `03 vans are still getting them.

 

Really? So my '02 Silverado with a 4.8L gen III engine that I bought new off the dealer's lot was some kind of oddball one-off?

And the really sinister plot...Chevy even prints a truck catalog that lists 4.8, 5.3, and 6.0L LS1 engines as the only options for their 1500 line of trucks. Not a gen I engine to be found.

Clearly you know something GM doesn't.

 

What I should have said was vans, not trucks. Vans still got Gen I SBC's (Vortec 5.7) through '02. I think we both knew the 1500 truck line is all Gen III already.

 

One of us did.

 

Kevin,

Did I hammer you & say that 97 had all 3 gens produced? No. Calm the hell down; I just wanted to clarify a couple things. I can point out as many mistakes if not more, in your post, as you did in mine.

Matthew

 

Point out one incorrect statement in my post...then go take your Ritalin ya spaz.

By the way, the part about passenger cars you posted is also wrong...Camaro, Firebird, and Vette platforms got Gen IIs.

The only thing you posted that was correct was "I don't know".

 

Now was that about '03? I already said I didn't know what the '03 vans got. Are you saying the '02 light truck & van line didn't get a Gen I SBC?

What I said was

1992 & 1993 B-body & D-body platforms received Gen I small blocks. My Uncle bought a brand new 1993 Fleetwood. Are you telling me it's not a Gen I SBC, or not a passenger car?

About '03 vans. I already corrected my statement about Trucks vs. Vans.

Having fun yet?

 

One correction to my earlier post...take 2x your normal Ritalin dose.

No further posts from me on this one, go ahead and reply if you feel it necessary.