I have seen 402, 408, 427 but is the 427 the largest motor for our cars?

No there are bigger. We also do 434s to even 447s but they are mostly NA only.

So what would be the best choice for running a 200+ shot?
track only

I believe the biggest ls1 so far is a 455

Iron block 408 would do nicely. Thats the plan for a customer-owned C5: HPE 408 longblock, let him get used to that, then work his way up from a 100 shot eventually to a 200 shot.

And whats the deal with iron block vs resleaved? (sorry learning as I go here)
benefits/disadvantages

Something reliable, that I can count on year after year

What is the C5r deal?

Iron block is stronger, more reliable. Also like 80lbs heavier? I do believe thats the #.

C5R is great. Also $6,000. Nice block tho.

wet sleeve block is .......wouldn't have anything else

If you have the money, get a Darton wet sleeve block and build a 427. Or a 455 No replacement for displacement. Iron is stronger, sure, but who here has heard of an aluminum LS1 block not being reliable or blowing up because of the material it is made of? I've been here since the begining and have never seen a post about it lol.

I got a bigger one, I love it. And I'm gonna spray the **** out of it, 200-300 shot, not sure yet.





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is it better to keep stock displacement if running 14+ psi? or do the iron sleeves serve better?

mti can do a 455 for you. if you look in the dyno section you can see the graph of the one they built for the shop gto. and let me tell you, the cam in that car is small. very small. the droping sleeves issue was with the older style dry sleeving method. it is not really possible for a wet sleeve motor to drop one. they also have recently done a 427 procharged vette for the car and driver tuner shoot out that made over 700rwhp. i think it was posted in the texas section by nineball if you want to check it out. just give jayson a call and he'll hook you up.

The wet sleeve block is practically indestructible. I have one and can say this because:


The min wall thickness at the bottom of the sleeve (smallest part) is 0.250" thick at a 4.125" bore and it only gets thicker as you go up the bore of the sleeve (STRONG!!!!). The sleeves are retained by a ledge in the main web so it can not drop and locked in by the head.

So really it comes down to "how much HP can the aluminum block its self hold?" (not the sleeves) and that has shown to be upwards of 1K HP or more if built with quality parts.

so a 455 wet sleeve would be the way to go for a reliable stroker that can handle tons of spray built with quality parts?

GEN 3 has every one beat with a 451............and its only 23K......

check out there site.............................................. .....................------>>>>>>

guess he didn't read the above post...

455 stroker from MTI is the biggest i seen

Power Torque Engines (Australia) are building my 434 (4.155" bore 4.00" stroke) I currently have a 383" motor from them while I wait for the 434".

They are also building a 461 (4.155" bore and 4.25" stroke) it will also have a direct port 300 NO2.

These are inhouse built blocks-wet sleeve.

Well I chose the iron block because I did not want to chance sleeves wet or dry. My last motor broke a valve spring and for some reason the valve dropped into the cylinder and cracked the sleeve pretty good. Pretty much cracked the block. I personally think if the exact same thing would have happened to an iron block I would have only scratched the cylinder wall. Lets hope this never happens again. If I had to chose blocks all over again I would still go iron.

GM's Toy box had the biggest possible in that Penske Replica Camaro. It started as a 471" motor. 4.2" bore and 4.25" crank. But it didn't stay together I think. They switched to a 427.