FormulaV8A4

anybody know who sells a good 421 stroker kit for the LT1?

dhdenney

iTrader: (53)

I don't know that an LT1 block could handle a 4.125" stroke crank. I've never heard of anyone trying something that big.

regorih383

iTrader: (21)

iooik0-k0-

Jordan57

I'll wait for Vendetta to chime in here, but I'm pretty sure Jason Short (a moderator on here) either builds them or knows where to get them. If I remember correctly, he had a 410ci LT1 built, sold the shortblock to another member on here, who sold it to my friend just up the street. I don't know the specs of hand but it is a 410ci.

BTW- You can make the same or more power on a 38X-39X with superior heads. A 421 would cost a lot, leave no room for a mistake, be prone to overheating, allow no n20, boost, power adders, oh yeah did I say expensive? Ballpark 9k+ for a forged shortblock.

rockcamaro97

The stroke/rod combo would cause a great deal of side loading, and to get those cubes ud have to go .060 over. So with that being said, id expect you having to buildin a new engine ever15-20K mi(im being optimistic) 388 is the BEST size to do max effort with. plently of cyl wall for good ring seal and the stroke is short enough it wont be trying to push the piston out the side of the block with a 6in rod.

Matt

JasonShort

iTrader: (242)

421 is "doable" but in my opinion not worth doing. I know a guy that built 2 421ci LTx motors for his car. Not cheap, but the parts were not the problem.....its the machine work. You are running on the edge with a build like that (clearances/wall thickness, etc..). I personally would not go larger than 410ci. You can build a 410 for no more than a 383/396 motor. Just be sure to use Lunati or Oliver rods since the big end is more profiled for clearing the pan rail. I wish now I would have kept the 410ci I sold



Jason

dhdenney

iTrader: (53)

I figured it up to be .030" over with a 4.125" crank. A couple people told me a 396 would be walking the line on the block with a 3.875" crank! I would be afraid to turn a 421 past 3000!

METALBEAST

iTrader: (1)

My friend Jeff has a 421 LT1 in his 99 S10. It puts down well over 500 RWHP but the engine alone cost him $16,000.

Vendetta

Haven't seen any 421ci LT1s in person, or even heard of many. I knew a guy who bought a 410ci LT1 to drop into a 97 Z28, but don't talk to him much and haven't heard from him since he bought it.

Jay, what was that shortblock in the garage that I saw while up there, that wasn't the 410ci was it?

Jordan57

i believe he sold that to another member on here, who ended up selling it to my friend, who is also on here...to drop in a 97 z28 vert

GhostZ

I really don't see the point. If it's only for saying "I have a 4XX ci motor" then more power to you but for me, it just isn't worth the enormous costs involved.

More power can be had out of a 2.2, Brodix, etc "exotic" head with a SR setup in a 355, 383 or 396 setup and would cost quite a bit less.

Personally I don't see why people dump a ton of money into these huge displacement LT1 setups. Hell if I wanted large displacement I would get rid of the LT1 block completely and go with an old SBC setup.

To me trying to push the LT1 block much further than it was ever meant to go is just putting money into something that won't have the longevity or cost of a much better platform.

GhostZ

To add to that it seems like a good many people want all of this and that without thinking everything through. They don't realize the costs involved in all of the peripherals. $1500 fuel system setups. $3000+ in transmission and drivetrain setups. Suspension, engine management, the list is endless.

People see a $1500 budget stroker kit and forget about everything else that has to go along with it to make a setup that works.

I don't know how many pipe dreams I've seen or read. People with these grand ideas of making a 1000HP beast usually don't get past the basic bolt-ons. It takes more than pipe dreams and hopes....it takes time, dedication, research and most of all, money to put together a setup that works well together.

FormulaV8A4

so how much power did you get out of your 410ci? the reason i've been thinkin bout a 421,is,i know a guy who had on,and he put down about 650-700rwhp, and that was the meanest sounding car i've ever heard (other than cars that make your ears bleed), to me, it's just cooler with all motor,rather than blower,or NOS

dhdenney

iTrader: (53)

650-700 rwhp? He had to have a little dose of juice or boost in there.

Fahad

Which company did your friend bought that engine 421ci??? i Haven't seen any 421ci LT1s so give me more details of your friend engine. please...

JasonShort. i think you right man..


Anybody know who sells a good 410 stroker kit for the LT1??

GhostZ

Do a search on CZ28...I remember seeing a few threads about them.

Really not worth it but different strokes for different folks.

FASTFATBOY

iTrader: (23)

I gotta ask this question, why would anyone build anything over a 396 inch LT1? Really anything over a 383 you have to worry about bottom end cracking into water if street driven. I put 1.5 inches of hardblock in my 383 just to be safe. A properly fed 383/396 will make 650 flywheel hp if you got the bank account to put the proper top end on it, fuel system and buy the cooling system to run it on the street. Is it to say" I gotta 421"? Because any cylinder head short of 330 cfm aint gonna begin to feed it over 5000 rpm, add that sheetmetal or HEAVILY modded converted Victor carb intake to feed those heads is gonna cost ya......so why even go down that road?

Just curious.

David

dhdenney

iTrader: (53)

Yeah sheetmetal intake is like $3000. Put that money in a dose of nitrous or something.

Fahad

CZ28 is invalid user name!!

Vendetta

CZ28 = camaroz28.com