408 Guys what size injector?

putting 42s in mine as soon as I find some under $200. Sheesh you'd think they were made of gold...

The 90mm setup will work. Wouldn't go anything smaller than 80mm. There is a guy by me with 75mm MAF and T/B on his 408. HP and TQ take a nose dive @ 5900 rpm when it runs out of air.

I'd go with 42lber's if it were mine.

toolow91 said:

Dude woody is a pretty known engine builder and he knows his stuff id trust what hes telling you....

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+1, I'd go with whatever Woody is telling you to go with. Also, google "fuel injector calculator", there are a ton of them out there.

As far as the TB, it is actually hard to go too big for parts on a 408. I would consider nothing less than a 90 for a 408. What is the rest of the setup?

Also google 408w and read. You'll notice a trend: 42lb injectors, 90mm tb, usually some variant of a Vic Jr/Sr, and at the least a single 255 lph pump

hoopty5.0 said:

putting 42s in mine as soon as I find some under $200. Sheesh you'd think they were made of gold...

The 90mm setup will work. Wouldn't go anything smaller than 80mm. There is a guy by me with 75mm MAF and T/B on his 408. HP and TQ take a nose dive @ 5900 rpm when it runs out of air.

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www.lightningrodder.com im sure you can find them in the classifieds

sweet, thanks. Might be a month or so. I blew my wad on valve covers and a big 'ol throttle body today.

hoopty5.0 said:

sweet, thanks. Might be a month or so. I blew my wad on valve covers and a big 'ol throttle body today.

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if they give you about being a newb and trying to buy parts just tell them derek@amazon sent you over.

srtthis said:

if they give you **** about being a newb and trying to buy parts just tell them derek@amazon sent you over.

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hahahah ok. Do they tend to be cheaper over there since 42s are OEM on the lightnings? All the ones I see on Corral are grubby used ones with no proof of quality or miles and they still want well over $200. Every now and then you see them show up for $180 or so, but are usually snatched up instantly

Posted in the 94-95 Sticky. The 42lb injectors are good up to around 685HP Flywheel.

hoopty5.0 said:

hahahah ok. Do they tend to be cheaper over there since 42s are OEM on the lightnings? All the ones I see on Corral are grubby used ones with no proof of quality or miles and they still want well over $200. Every now and then you see them show up for $180 or so, but are usually snatched up instantly

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yup... you can find them for about 100-150 most of the times

srtthis said:

yup... you can find them for about 100-150 most of the times

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You just made my day

Is this a street car? What tuner will you be using?

Either injector will work, truly a 36lb could work and be a little less hassle in a street car, less to trim out down low where you'll spend most of your time. IF you need a little up top you can increase pressure, still better then having a overly large injector to deal with.

90mmTB, and 92mm Pro-M meter get my vote.

srtthis - Whats your thoughts on the issues with large injectors in a street car, this is something I think about more often now days....tuning out large injectors can be a PIA.

hoopty, having the 75mm tb shouldnt be an issue with the 408, his big issue is the 75mm MAF.

Rick@amazon did all the tuning and never seemed to have any issues doing it.

but i def see where your coming from.

I find 60+ to a PIA down low

really? i know 60's are better then 50's or 55's. i have heard issues from some tuners on the 83's though

more so on turbo cars, damn things are finiky down low

actually i may have a answer for you on why...

does it do it on ALL the 60's you use or just some?