Northwest Members - 421CID stroker from texas speed

anyone seen this new motor yet? looks like the same price as the 408 iron block. could be something to lool into.

being the same price as a 408, it seems to good to be true. 421ci is some serious cubes

I'm not a big fan of the 4.1+ stroke cranks, especially on a 6.0 iron block with short cylinder walls.

Mike

I'm not a big fan of the 4.1+ stroke cranks, especially on a 6.0 iron block with short cylinder walls.

Mike

is there an issue with it? iim kinda likeing the sound of this motor

is there an issue with it? iim kinda likeing the sound of this motor

Greater thrust angle = greater piston loading against the cylinder wall. Couple that with a short cylinder length and it's a recipe that many engine builders don't care for. I personally wouldn't run a 4.1+ stroke crank in any LS based engine except a tall deck block. But that's just me.

Mike

Greater thrust angle = greater piston loading against the cylinder wall. Couple that with a short cylinder length and it's a recipe that many engine builders don't care for. I personally wouldn't run a 4.1+ stroke crank in any LS based engine except a tall deck block. But that's just me.

Mike

so...realistically, would running that motor be a bad idea? i wouldnt be running boost or N20. just na

i mean is it prone to thro a rod or something?

Sounds like he is just saying you gonna crack the block or something... But it makes sense i guess... Im not very smart on the subject but it sounds like its right

Joe is your car all up and going again? Back cruisin?

Joe is your car all up and going again? Back cruisin?

no not yet, maybe soon...maybe not, im not really worreid about it right now

Greater thrust angle = greater piston loading against the cylinder wall. Couple that with a short cylinder length and it's a recipe that many engine builders don't care for. I personally wouldn't run a 4.1+ stroke crank in any LS based engine except a tall deck block. But that's just me.

Mike

Totally agree. It would be interesting to find out what kind of longevity this setup is capable of...especially with some spray or FI. I'm no expert, but it seems like it would be a pretty short-lived scenario. :confused:

You should just sell me your SS and buy a 421 :)

There is a lot of controversy over running a 4.1" stroke on an ls block. It puts too much pressure on the sides of the piston skirts, especially with how short they are as it is. A lot of people don't even like the 4" stroke just because you don't have much piston side skirt to make it be able to clear the crank. look in some of the threads people get furious about it lol.

Greater thrust angle = greater piston loading against the cylinder wall. Couple that with a short cylinder length and it's a recipe that many engine builders don't care for. I personally wouldn't run a 4.1+ stroke crank in any LS based engine except a tall deck block. But that's just me.

Mike


It isn't just you that thinks that. A friend (in Utah) HAD a 427 Agastino that he had nothing but problems with and eventually meet it's demise.

In my experience a motor built as close to square as possible usually last the longest and you can spin the crap out of them.

In my experience a motor built as close to square as possible usually last the longest and you can spin the crap out of them.

ive decided not to go with the 421 stroker...it will be about another 6 months before im gonna seriosly plan out my build anyway. need to catch a few more squid before i can afford it. im kinda thinking a 408 would be the most cost effective anyway

370 is the most cost effective I think.(with a 76mm)

370 is the most cost effective I think.(with a 76mm)

but isnt a turbo/IC plus the price of the block and and all the internals gonnna cost significantly more than say a 408? i guess a turbo 370 should be good for about 550+hp? i really have no clue, plus its harrd for me to judge stuff like that since my brain surgery

actually a lsx454 shortblock only costs $2K more than a 408 short block..if i do well enough with fishing the rest of the year ill pull the trigger on the 454. im just in dream mode right now but the 454 is the motor i want and hope to have.

Just depends man. Do you want to buy a turbo or SC new or used? New you're looking at about 3G's and up for either set up. I would find a motor in a wrecking yard like I did. I only paid 1,000$ for mine. Internals, again just depends on what you want. I'll be probably 4grand into my motor before I sell everything else and will have around 620+ to the wheels. Hell John aka fury is into only 1600 including his motor.:D

Just depends man. Do you want to buy a turbo or SC new or used? New you're looking at about 3G's and up for either set up. I would find a motor in a wrecking yard like I did. I only paid 1,000$ for mine. Internals, again just depends on what you want. I'll be probably 4grand into my motor before I sell everything else and will have around 620+ to the wheels. Hell John aka fury is into only 1600 including his motor.:D

since i plan on lsx454, ill have to just but it all new, thats fine with me...but i change my mind aloy and buying a 454 will depend on how much money i make in cali. i will be going NA for this build and my goal is to have at least 600RWHP. plus car will have gobs of TQ thats what is most appealing about the 454

Yep I hear ya bro.:).. I would love to have a 454 in mine. But for the price you pay to get that HP just doesn't justify. But hell! I know you will be extremely happy if you got one, so I say keep your dreams high and it will come to ya:)

Yep I hear ya bro.:).. I would love to have a 454 in mine. But for the price you pay to get that HP just doesn't justify. But hell! I know you will be extremely happy if you got one, so I say keep your dreams high and it will come to ya:)

ya the 454 is the sickest lsx motor in my opinion. id say it justifies pretty well, the cost of the shortblock is only $2000 more than a 408, the topend kits will cost the same. ill pay around 10 grand for it tho. i considered goin with a procharged 408 but staying NA seems easier to me and i like the oldschool CI :)

ya the 454 is the sickest lsx motor in my opinion. id say it justifies pretty well, the cost of the shortblock is only $2000 more than a 408, the topend kits will cost the same. ill pay around 10 grand for it tho. i considered goin with a procharged 408 but staying NA seems easier to me and i like the oldschool CI :)

the amount of NA TQ justifies:) lol

Turbo for the win. I wanna do a t88 on 19lbs Should be good for high 700's

Turbo for the win. I wanna do a t88 on 19lbs Should be good for high 700's

id opt for a big procharger or other type of supercharger...i just really like NA cars.

big cube NA cars are just so beastly, i love it!

big cube NA cars are just so beastly, i love it!

That they are....but if you're going to DD the thing, feeding a big-cube engine will be expensive as hell at every fill-up. Just something to consider on a DD vehicle. Might be better to just spray a smaller-cube powerplant if it's a DD. If it's a weekend toy, then go big-cube.

Whatever you decide to do, it'll be a shitload of fun :D

That they are....but if you're going to DD the thing, feeding a big-cube engine will be expensive as hell at every fill-up. Just something to consider on a DD vehicle. Might be better to just spray a smaller-cube powerplant if it's a DD. If it's a weekend toy, then go big-cube.

Whatever you decide to do, it'll be a shitload of fun :D

wont be a dd, i always have pos dd's that dont last but ive learned my lesson. i will have a decent car before i go thrus with a motor swap

so, ive decided not to go with a new motor at all...at least not for a while. just gonna get some gears with a 9 inch, clutch, tranny work, roller rockers etc...get the car back in shape and running good. i dont need to buy rediculously expensive motors right now. its easy to let your dreams get out of control. i can get mid to low 11's just by doing the mods i listed plus the motor i have is allready pretty mean..it has alot more than a low 12 in her lol. anyway i was just thinking about this today and thought i would share it.

good night

Skip the roller rockers, stock rockers are as good as it gets. All the aftermarket roller rockers weigh more and cause valvetrain stability issues.

Really?

No shit? I've always heard good things about roller rockers. There has got to be something more I can do to squeeze out some more ponies.

Who knows, a super charger is something I'd also love tl do. A Maggie or another type of roots blower would be the shit...not a big fan of turbos..I don't want Turbo lag plus blowers sound so. Cool

Skip the roller rockers, stock rockers are as good as it gets. All the aftermarket roller rockers weigh more and cause valvetrain stability issues.

Just have the stock rockers upgraded by Harland Sharp or do the trunion upgrade yourself. Like $300-$350 for them to do and like $150-$200 to buy kit and DIY. Theextra $150 for them to do 16 of them sounds great to me. And I'm the DIY type. I will be assembling my 408 or 416 stroker.

I'm keeping my eyes out for a LS3 or L92 block so I can do a 416 but may settle on a 408 iron build. Will be blown by Kenne Bell or Whipple.

Skip the roller rockers, stock rockers are as good as it gets. All the aftermarket roller rockers weigh more and cause valvetrain stability issues.

^^^^^^Werd....

Also...Consider Comp Hi Tech pushrods, Ti retainers, etc if you really plan to spin the hell out of it. Maybe LS7 lifters and new trays as well.

Guess you haven't been in a turbo'd lsx :D I've been around most ls setups, nitrous, big cubes, procharger etc. Turbo hands down is the best setup in my opnion.

Guess you haven't been in a turbo'd lsx :D I've been around most ls setups, nitrous, big cubes, procharger etc. Turbo hands down is the best setup in my opnion.

For me it's the idea of the modern take on old school... Chevelle, cubes, blower, headers... F-Body I would go turbo in a heart beat.

Sorry to hijack...:D

The way i see it blowers are for muscle cars and turbos are for imports. Plus I want brute force low end of a blower