How would all you LTx engine owners like to be able to build a 434 or larger LT1? Well if the likes of Dart or World products would cast us a block we could have one. But for them its an economics question. So if all you guys were to call Dart and ask if they have a little M block for a LT1, maybe they would consider casting one. It is only going to happen if they know that there would be considerable interest in one of these blocks. It is just an idea.....

 

Sounds cool but how much would something like that cost . I dont think that many people will go for this because im sure that your could make more power for less $$$ with a blown 355,383,396. I guess if you wanted to stay na then maby but im sure its going to be really expensive.

 

A little M LT1 block, Hmmm mabey it's time to start over. I can tell you that i would have been all over somthing like this if it would have existed when I built my motor. A 434 LT1 could make over 450 RWHP and still idle like stock and get good gas milage. At almost a 15% CI increase over the 383 this would be a nasty combo if done right.

 

What makes an LT1 an LT1 is the heads. Even the best LT1 heads are only fair compared to the 18 degree heads out there, so why stick with an "LT1" if you are building something exotic enough to require an aftermarket block? Just chuck the LT1 and build a gen I.

Rich

 

It would be very cool and i would prob do it if i had the $$$. Like said before, something like that has to cost a lot.

 

The FI system also. Mostly the reason I like the LT1, cheap tuning.

 

With that size motor there's no way you could feed it with lt1 heads. I think it would be a better idea to create and intake that allows us to swap our fuel injection setup over to fit a sbc, that way we wouldn't be stuck with 23 degree heads.

 

Remember though, If you want to swap the stock injection setup and ecu, be ready to figure out a way to make the opti work. the opti is a necessary and unreplaceable part of the fuel injection setup on the lt1's. It controlls the fuel injector events and also the spark timing.

 

you would have to have some sort of custom timing cover made up and use a longer pin in the cam like the later lt1s. im sure someone's done something like this before. you'd also have to do something with the thermostat.

 

23 degree 434's is done every day and AFR makes heads that do, and can be ported even farther, to flow more then enough. A little M block is around $1800 I spent over $600 just on my splayed mains so it is what I would consider a reasonable fee. I find it interesting that when the subject of going 383 or 396 is brought up it seems that there are a lot of folks that say go 396 for the extra few $$$, the difference in rotating assembly and machine work would be around the same and the little M block is on a completely different level then the LT1 block and could easily take added stroke without worrying about grinding into a water jacket.. The 18 degree head is great but it is a completely different subject. I see plenty of TPI based 400+ CI motors being built with 23 degree heads and modified intakes such as the single plane.

 

Why not make an LS1 FI and timing system work for it? The coil per cylinder is a much better design.

 

the whole point to this thread (as far as i gather) is about doing this in a lt1 car. if you want coil per cylinder in an lt1 then just do ltcc or delteq. and when you get into the ls1 FI setup there are way more sensors and crap you have to deal with. besides if someone wants a 4xxci Fbod then ls1 is the way to go. nothing wrong with a 427 ls1

 

You could always sleeve the LT1 block to do a large bore setup. The 4.00" crank is always hard too.

Either way a SBC with a Accel DFI or a FAST setup would be easier and cheaper.

Bret

 

Well i just was saying because the opti-spark sucks. It seems like too much work for what it would be worth though. It would be nice to be able to retain OBD1 with the LT1 block though.

 

so with out worrying about the opti and a stock water pump. What else is different from and LT1 and a GEN 1 block?