Tsp 421
Thread Starter
On The Tree
Joined: Jul 2009
Posts: 146
Likes: 0
From: Moore, OK
Tsp 421 http://texas-speed.com/p-678-tsp-421...ong-block.aspx
Thinking about going this route for my next engine build. When my stocker gives out. I am looking for something with large cubes and makes a *** ton of power, on a budget. LOL
The engine will be going into a full weight 2004 Pontiac GTO,6 speed,with 3.91 gears. I will be street driving this car as well as the occasional run down the track. I am unsure if it will be a DD at the time the engine is built.
I was planing on useing the PRC stg 3 LS6 heads, a Victor jr intake with 100mm TB. There are several things that i am still unsure of.
Cam?
Valvetrain?
Fuel?
I am looking for around 600 rwhp.
What are your thoughts? What would you recomend? Thanks guys.
Thinking about going this route for my next engine build. When my stocker gives out. I am looking for something with large cubes and makes a *** ton of power, on a budget. LOL
The engine will be going into a full weight 2004 Pontiac GTO,6 speed,with 3.91 gears. I will be street driving this car as well as the occasional run down the track. I am unsure if it will be a DD at the time the engine is built.
I was planing on useing the PRC stg 3 LS6 heads, a Victor jr intake with 100mm TB. There are several things that i am still unsure of.
Cam?
Valvetrain?
Fuel?
I am looking for around 600 rwhp.
What are your thoughts? What would you recomend? Thanks guys.
You do know that's an iron block right? That might be 100-200 lbs. heavier, though if you're willing to absorb the weight you should be good with gears. You'll probably have difficulty getting 600 to the wheels, but if you can, look out because that sucker's going to cook.
Thread Starter
On The Tree
Joined: Jul 2009
Posts: 146
Likes: 0
From: Moore, OK
Yes i realize the added weight. And from what i have read 600 rwhp is verry easy to do with these engines. But i need to look at this in a more logical way. I am not building a drag car. I am building a all motor street car. But also something that i can take to the track and put down some good times. So that being said i am sure that i will be sticking with a hyd cam and not go with a solid cam. Im just not sure of how big or small to go. I relize that its a large bore and c.i. so i was thinking something with a med duration (230-250) and something with alot of lift (600+).
I was also planing on use a LPE 225 fuel pump bu i am not sure of what size injector to go with.
I was also planing on use a LPE 225 fuel pump bu i am not sure of what size injector to go with.
TECH Resident
Joined: Jan 2009
Posts: 873
Likes: 1
From: oakland, ca
I think you should rethink those heads. I would look at getting the PRC 227 at least. A cam in the 240s should get the job done and still keep it streetable for daily duty. You could always keep the cam on the smaller side and hit her with a little juice. I would do a 42lb-60lb injector as well.
600rwhp is definitely not the norm from a long-stroke iron block unless you add the extra bore size and go with the LSx bowtie block. At that point you can run the LS7 heads and really start to extract the power you want from it, but with that relatively small bore size on that 421, you are a bit limited in that regard.
__________________
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
The problem with long stroke is RPM limit. Yeah it's easy to pull killer torque numbers but it will run out of breath at just over six thousand. You want to pull a serious number then I would bore and stroke it. With the better bore-to-stroke ratio it will also allow for better heads.
Last edited by lsx24; Aug 10, 2011 at 05:51 PM.
Trending Topics
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
You do know that's an iron block right? That might be 100-200 lbs. heavier, though if you're willing to absorb the weight you should be good with gears. You'll probably have difficulty getting 600 to the wheels, but if you can, look out because that sucker's going to cook.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
