Hi there

Would like to know, does a L-98 also run on carb ? Where to get a new L-98 ? Would like to swap my LG4 to a L-98, but should be running on carb.

1985 IROC ,4 wheel disc, sbfc, LG4 dyno 193HP, Flowmaster muffler, Centerline Hatchet...

 

Engines are almost exactly the same, easy change to this. To use the carburetor you need the intake manifold, carb, and an HEI distributor with a vacuum advance like the earlier cars back in the 70s. You may have to change the flywheel if the L98 is a newer engine, 1987 and later.

 

i just bought a new L98 about $1200 w/ shipping a little more but dont remember. to purchse go to sdpc2000.com then find the short blocks(thats the only L98 i could find)

 

I received a SDPC catalogue this week, but it looks like they don't offer it anymore.

What exactly did you add to your L-98 ? How much HP do you expect ? I think a L-98 could really be a good choice, cuz it is somehow an original engine, but of course with a carb a bit different.

 

i have a carbed L98 in my 86 camaro. ofcourse i tore it to pieces and built it from the ground up, but i still call it an L98. manifold, carb, and all MSD electronics and your good to go

 

I think you will be disappointed. The L98 shortblock is a 2 bolt main, designed to spin to 4500 rpm and has a rather mild cam for its displacement. It can spin reliably to 5500 rpm on a carb but will REQUIRE a much more aggressive cam to do so.

Save yourself some money and get a regular old rebuilt 350 shortblock, minus the cam. Then pick your own cam and maybe stick some Vortec heads and intake on it. Should be good for 330 to 350 hp. Way more than the L98's original and lethargic 230 hp.

 

Hi Sitting Bull

Well I was told by SDPC that the announced 350 engine with 330HP uses the L-31 short block. Where does it come from ? I've never heard fom a L-31. This could be a nice solution too.

 

Don't know, really. I'm sure it is just a standard 350 engine with a better cam, heads and intake. Maybe forged pistons but I doubt it.

Any old 350 with 8.5 or 9:1 hypereutectic pistons can be made to pump 350 hp with relative ease--as long as it is in good shape.

It is when you insist on turning 6000 or 7000 rpm to hit 450 hp that it gets REALLY expensive because then you NEED forged internals and high quality parts in the valve train. And then you need to beef up the tranny and rear end to handle it all. All of a sudden you are up to $10,000 in parts alone!

 

You are right, but I don't want that much HP, cuz overhere we have a strict law and that means it is not so easy to modifie parts on you car. It depends what age you car has, the older it is the easier it's to change parts.

So I need to think about the 350 with 330 HP or as SDPC recommended using a ZZ-4 with a milder cam, I was told that the ZZ-4 is actually based on a L-98 using nice parts to end up with 355 HP. Just to mention overhere headers are not allowed (depends on the year of car) and I would like to use my stock tranny. I think an announced engine of 330HP will make just 240 RWHP without headers so my TH-700R4 should handle it.

 

Yes, I think you've got a handle on it now.

A ZZ4 has four bolt mains, however, while the L98 has only two.

If you want to buy a crate motor with all the parts already there, GM does make that 330 hp 350, which is just one step below the ZZ4. Probably just what you want.

 

Hi there

I talked to my mechanic today and he thinks I should save some money as I was told before on the board, to get a ZZ-4. The reason: Overhere we do talk about DIN PS that means a 330HP will only make 270 DIN PS without headers even less, so he thinks a ZZ-4 as a minimum.

 

Converting from DIN to SAE HP numbers won't cost you that much (calulated) power. 10-20 HP tops. You need somebody smarter than me to calculate it for you, but you won't drop 50HP in the recalculation. Without headers you might be close to that much of a drop, but still, I think you're being a bit conservative.

How is anyone going to know how much HP you make anyway? It's a 350 with a carb- how much more could they possibly know about it? They're not going to rip off the cam and heads to do flow and lift checks. What business is it of theirs what the motor makes as long as it passes inspection. I mean, what if you rebuilt your LG-4 with different cam, heads, etc.? How would they know your horsepower on a home-built combination like that? Do they actually do rear wheel HP measurements? If so, that would be REAL easy to scew the results. For that matter how do they even know it's a 305 and not a stock 305?? They all look the same on the outside.

I'm with Sitting Bull on this one. Sounds like the 330HP 350HO motor would be about what you are looking for.