Looking for advice on intake manifold selection for a 15psi 408 motor. If the stock truck manifold will do fine I'll just go with that, but since I've been s/c'ed since I got into this stuff I really haven't paid attention to what has worked well for other setups. Recommendations?

Also - I'm thinking I'll need to step up to 60# injectors. I'm going to be running the stock in-tank pump and the Walbro inline from the Radix kit. 42#'ers were maxing out with a stock 6.0L and 9psi, so I doubt they will be enough for the new setup. Also - are stock fuel rails enough for something like this?

Thanks!

 

hmm, you might be able to get away with 60# injectors but the fuel pump might be an issue. I ended up going with 72lb injectors and a HUGE aeromotive pump along with the speed-eng 1000hp fuel system. Also got the vic jr intake and Nick williams 90mm TB. Probably overkill, but, we'll see. Best of luck.

 

I would go with a Vic Jr. intake manifold hands down. Don't waste time with the stock one and run the risk of leaning out old #7.

So what brought on this sudden urge to build a turbo 408? Why not just put the new MP122 on it since you have the Radix setup already?

 

Ready for something new....I dunno....potential motor problems with the LQ9 here
https://www.performancetrucks.net/fo...d.php?t=379166

I think my end goals will be better suited by a turbo setup overall.

 

I think the Vr. Jr and a nice motor with a T76 would be sweet!

 

Well, I'd buy that LQ9 off of you because I garauntee it's not that bad. Did you do a compression test on it? You could always build off that block, crank and rods to save some coin. Check out the 4 digit numbers guys on tech are making with 347's and 370's.

Either way a Victor Jr. is where its at. What are your power goals? That will tell us what injectors and fuel pump(s) you should use.

 

I honestly don't know how far I'll want to go with it, I'd say 700 rwhp for now, but I wouldn't be surprised if I'm looking for more in a year. I guess for now I should plan for 800, that way if I'm in the 600-700 range I'll have some room to grow. I would really like to just go for it, do it once, and do it right. I know that at some point I'll want more cubes, so I really don't want to sink money into something that I'll want to replace soon anyway. If the LQ9 problem isn't bad then I'll be able to sell it for a good price, sell the Maggie, and come out as close to even as I could ever hope for a good forged 408. Then I can buy turbo parts as I feel like it and have the money to.

 

i think a 6.0 with pistons and rods and a 76 is a very solid and well matched set up. decent hp without too much lag and you save a little money over a 408.

 

When you say decent what do you mean exactly?

 

with good fuel over 600rwhp with the same 76 i had. should be over 700rwhp with the right 76(gts76?).

if you looking for much more than 700rwhp then you will need something bigger than a 76 and at that point a 408 might be nice to help reduce lag.