(L99) 4.3L V8 (Possibly Building A Stroker...)
12-27-2017, 07:21 AM
#21
You want a small cube high rpm engine to move a 5000lb car? Not the best way to do it. Building a different engine like that has a "unique" factor about it, but nothing more, and it's a bad choice to put that into a heavy car. Small bore= small valves= limited airflow= limited power. You'll spend a small fortune to try and get 400hp.
12-27-2017, 07:54 AM
#22
Teching In
Thread Starter
It doesn't matter if you have the same stroke it's not going to be the same as a 383 because it will not have the same displacement. You'll make the same shitty power with maybe a little more torque and that's if you put decent heads and cam on it. Judging by your other thread it looks like you're going down the road to Failville as well, but go ahead and try to reinvent the wheel.
I'm telling you, if what you're trying actually made power it would've been done long ago.
I'm telling you, if what you're trying actually made power it would've been done long ago.
12-27-2017, 08:04 AM
#23
Teching In
Thread Starter
I mean we got guys making 400HP N/A K20/K24 Setups out of a 4 Cylinder and it not be an issue... Why can't I make 350HP in a Stroked L99? It hasn't be done because nobody has tried and actually put effort into it... I'm not a Lazy, sorry MF though... ��dum♂️
12-27-2017, 09:43 AM
#24
Village Troll 
iTrader: (2)
I'm not trying to be anything like a 383 besides the Torque from the Stroke. It makes 200HP/245TQ Stock. I want to try and obtain 350HP at least from my L99. That's all. I want to see if it can be done N/A. That's it. If I was that worried about Gappin' someone up, it'd be LS Swapped Months ago.
My suggestion is LPE heads and a LPE/Accel(whoever makes it now) 211/219 cam with .533/.560 lift and 112LSA as I think has already been suggested. You'll have a lot more promise of achieving your goal than your current cam choice and the car will be fun to drive. You may only have to stall it to something like a 2800 and use something like a 3.42 or maybe a 3.73 gear because of your CID.
12-27-2017, 09:48 AM
#25
Teching In
Thread Starter
I planned on using a 4.10 Gear... Well, I do plan on doing Springs, Lifters, Hardened Pushrods... IDK what the absolute Limit is on Lift I can go on L99 Heads... Keeping and Porting... Will be CNC'd...
12-27-2017, 10:14 AM
#27
Teching In
Thread Starter
I'm made up on keeping my Heads, Upgrading Parts in them. Also made up my mind on Stroking my Car. What I have a problem with is deciding what Cam to use right now.
12-27-2017, 10:31 AM
#31
Village Troll
iTrader: (2)
I can only recommend what I've ran. I do know with the short intake runners you want to run a smaller duration on the intake side than exhaust. I would suggest talking to someone who does this for a living. Advanced Induction would be my choice.
Another cam I ran on a 350 was the GM 847. It made 399.9rwhp on my same LPE heads, same torque and it was miserable to drive on the street. Ran a best of 12.3 @ 113 or 114mph. Was still running a 3.73 gear, but a 4.10 would've only helped marginally. Big cam/small cubes is a no no for a street car.
Another cam I ran on a 350 was the GM 847. It made 399.9rwhp on my same LPE heads, same torque and it was miserable to drive on the street. Ran a best of 12.3 @ 113 or 114mph. Was still running a 3.73 gear, but a 4.10 would've only helped marginally. Big cam/small cubes is a no no for a street car.
12-27-2017, 11:35 PM
#35
A 220*/225* cam (with about 114* LSA) would be as big as I'd go if you can't get more than about 10:1 to 10.5:1 compression.
Good HP and very good torque numbers would be possible.
Lift? Completely unimportant as long as your heads can handle the airflow without turbulence and the valve train is well spec'ed out.
Hell.....I routinely do more than .600" in my daily drivers.
If it were my engine, I would get the cam last.....after I had the heads flowed up to .700". That, or just keep cam lift to .550" or slightly less.....when even stock heads can handle.
Agreed!!
KW
Good HP and very good torque numbers would be possible.
Lift? Completely unimportant as long as your heads can handle the airflow without turbulence and the valve train is well spec'ed out.
Hell.....I routinely do more than .600" in my daily drivers.
If it were my engine, I would get the cam last.....after I had the heads flowed up to .700". That, or just keep cam lift to .550" or slightly less.....when even stock heads can handle.
Agreed!!
KW
Last edited by KW Baraka; 12-27-2017 at 11:41 PM.
12-28-2017, 08:49 AM
#36
On The Tree
There's a guy in the post below that did basically this exact same thing, took an L99 4.3 and put the 305 rotating assembly in to get to 305 CI, LT4 cam, and headers, all in a Caprice.
15.3 quarter mile. Meh. Different is good and all, but it's going to be slower than a more usual swap. If you're getting the engine on the cheap and can use OEM parts that you get for cheap as well to build it, and that's your budget, then cool, go with it. If you're dumping in a bunch of money just for the sake of being "different", buying new cam, pistons, etc, you might as well be different with something with more cubes.
Nobody here is trying to be a dick, but if you're posing a question about the set up, people are trying to give honest answers. As you can see in the post linked below it has been done, you won't be the first - it's just not done often because it's slow.
https://www.thirdgen.org/forums/ltx-...ml#post4008788
15.3 quarter mile. Meh. Different is good and all, but it's going to be slower than a more usual swap. If you're getting the engine on the cheap and can use OEM parts that you get for cheap as well to build it, and that's your budget, then cool, go with it. If you're dumping in a bunch of money just for the sake of being "different", buying new cam, pistons, etc, you might as well be different with something with more cubes.
Nobody here is trying to be a dick, but if you're posing a question about the set up, people are trying to give honest answers. As you can see in the post linked below it has been done, you won't be the first - it's just not done often because it's slow.
https://www.thirdgen.org/forums/ltx-...ml#post4008788
01-02-2018, 02:26 PM
#38
TECH Resident
There's a guy in the post below that did basically this exact same thing, took an L99 4.3 and put the 305 rotating assembly in to get to 305 CI, LT4 cam, and headers, all in a Caprice.
15.3 quarter mile. Meh. Different is good and all, but it's going to be slower than a more usual swap. If you're getting the engine on the cheap and can use OEM parts that you get for cheap as well to build it, and that's your budget, then cool, go with it. If you're dumping in a bunch of money just for the sake of being "different", buying new cam, pistons, etc, you might as well be different with something with more cubes.
Nobody here is trying to be a dick, but if you're posing a question about the set up, people are trying to give honest answers. As you can see in the post linked below it has been done, you won't be the first - it's just not done often because it's slow.
https://www.thirdgen.org/forums/ltx-...ml#post4008788
15.3 quarter mile. Meh. Different is good and all, but it's going to be slower than a more usual swap. If you're getting the engine on the cheap and can use OEM parts that you get for cheap as well to build it, and that's your budget, then cool, go with it. If you're dumping in a bunch of money just for the sake of being "different", buying new cam, pistons, etc, you might as well be different with something with more cubes.
Nobody here is trying to be a dick, but if you're posing a question about the set up, people are trying to give honest answers. As you can see in the post linked below it has been done, you won't be the first - it's just not done often because it's slow.
https://www.thirdgen.org/forums/ltx-...ml#post4008788
Like I said I only did it because it was a 4.3 to start with, the 5.7 LT1 commanded a fairly steep price at the time, and I had the 305 crank and rods sitting on the shelf. With everyone ditching the LT based engines for the newer LS/LT engines, I would just find a 350 block and aluminum heads. If you want different, bore the 350 block .030", put a 3.875" stroke crank in it, 6" rods and build a 6" rod 396 LT1.
I am currently building a healthy 426 small block 400 based stroker (4.185 x 3.875" with 6" rods) for my Express van to replace the 350. In something heavy displacement makes torque and torque moves the weight.
Last edited by Fast355; 01-02-2018 at 03:26 PM.
01-03-2018, 11:21 AM
#39
On The Tree
AHHH...My old 305 LT1 build.
Like I said I only did it because it was a 4.3 to start with, the 5.7 LT1 commanded a fairly steep price at the time, and I had the 305 crank and rods sitting on the shelf. With everyone ditching the LT based engines for the newer LS/LT engines, I would just find a 350 block and aluminum heads. If you want different, bore the 350 block .030", put a 3.875" stroke crank in it, 6" rods and build a 6" rod 396 LT1.
I am currently building a healthy 426 small block 400 based stroker (4.185 x 3.875" with 6" rods) for my Express van to replace the 350. In something heavy displacement makes torque and torque moves the weight.
Like I said I only did it because it was a 4.3 to start with, the 5.7 LT1 commanded a fairly steep price at the time, and I had the 305 crank and rods sitting on the shelf. With everyone ditching the LT based engines for the newer LS/LT engines, I would just find a 350 block and aluminum heads. If you want different, bore the 350 block .030", put a 3.875" stroke crank in it, 6" rods and build a 6" rod 396 LT1.
I am currently building a healthy 426 small block 400 based stroker (4.185 x 3.875" with 6" rods) for my Express van to replace the 350. In something heavy displacement makes torque and torque moves the weight.
01-03-2018, 02:01 PM
#40
FormerVendor
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LT-1 Swap Camshaft Firing Order Hi L-99, I would like to know the Firing Order of your chosen camshaft ?
I have, my 2nd hand parts shelf, an Eagle Forged Crankshaft/Rods. (one piece)
You could have a great price if interested ?
Lance
I have, my 2nd hand parts shelf, an Eagle Forged Crankshaft/Rods. (one piece)
You could have a great price if interested ?
Lance