ltonenewbie

Long time reader, wanting some impressive stock bottom end results that many have shown.
going to ai for the h/c combo but before bombarding them with my newbieness I wanted to try to learn on here.

At this point I'm looking to hear what stock bottom end, untouched 350ci guys are revving to. Also any advice on trying to keep it alive for atleast a little while?

So far I've got..
-cai
-longtubes with 3" dumped bullets
-4.10s
-yank 4000
-built trans with sufficient rear end
-55lb injectors incase I go e85

Not sure on fuel pump as I read walbro will die on e85
Which bearings need replacement?
Melling oil pump?

Looking at an estimated 3300 race weight, I'm trying to get as deep into 11s as I can get all motor and hope I'll only need 50-100 shot to break high 10s. Any tips?

joelster

I rev mine to 6800-6900 no problem. Mine was rebuilt with new bearings and a new oil pump. Has amazing oil pressure. I just ran a bunch of 7.30's (1/8th) at our local track which is notoriously slow (about a tenth) in the summer heat. Not to bench race but i'm sure it will run 7.2's/11.25ish in the 1/4 as it sits now in the heat of the day. I have some more weight to take out, and i'm going to try to get a 10.99 sometime in the late summer/early fall when we get a "good air" day.

I would get the car as light as possible. 3300 race weight is light but you can get it down 150lbs from that without spending too much coin. Keep in mind you will need a cage. Get a chromoly one when you do. You are going to need a tall rear tire to offset those gears. If you want to run in the high 10's you'll be around 120mph. Combined with an auto that will slip a bit up top, I don't think a 26 inch tire will get you there.

ltonenewbie

thanks for the reply it sounds like you're right there NA!

after reading, it seems like the general idea for 4.10s is 28" diameter..

i'm almost wishing i had more gear because i'm seeing some awesome 60s from people running 30", but to cross the traps at 6900 and 120mph i would need around a 4.80 gear.

Wicked94Z

iTrader: (26)

you'll need dual walbros to hit 10s on e85. good fuel systems arent cheap, especially with alcohol compatible efi pumps.

ltonenewbie

i'll have to read more, but wasn't sure if the walbro failures on e85 were duty related or component

T/ALT1

iTrader: (3)

I went 10's on a stock bottomend 6yrs. back and it wasn't very hard to do once you add a little n2o. Any decent ported heads/cam, longtube headers, good exhaust, boltons, 3.500 stall, 3.42-3.73gears, 26-28" tall drag radials, little weight reduction, minor suspension work should run 11's on motor. So add a 100shot to that and your in the 10's very easy. My car would run 11.20-40 depending on weather and run low 10's on 150HP n2o with stock 3.42's in the 10bolt. The car ran 10.17@133mph on 150HP with 3.55's in an 8.8" rear with a best of 9.83@136mph on 200HP of n20 but that was a built 355" LT1 with good pistons rods etc.... Later Clint

blackmagicturbo

iTrader: (2)

Walboros are for volume not pressure, ive seen people run on e85 over a year now with Walboro 255 with no problem, just not high fuel pressure above (75psi) I personally run two 255s on my cars just because it makes me feel better and 100psi is no problem with two..

joelster

You cannot use those gear calculators when trying to get a true mph. An auto car will always lose mph due to slippage. You could plug in your rpm, your tire height and your gear (3rd 1:1), and it may say 120mph, but when you actually do it you might get 115-116. If you rock a 4L60e you can still cut an amazing 60ft time because of the insanely low first gear in those trannies.

ltonenewbie

Yeah I'm on a lower budget for this build, glad high 10s with a small shot doesn't sound impossible..

I'll have to look into dual walbros then, I appreciate it

So with slippage the rpms would be higher than the mph reflects? Then if I understand correctly, a little too much gear is ok.

You guys running bigger than 28" tires?

T/ALT1

iTrader: (3)

I run both 325/50/15 M/T Et street radials and 28"M/T slicks and they both work well here is a pic of my car leaving on the 28x10.5's,

It's not easy to get into the 10's on motor with a 350" LT1 N/A but plenty people have made it just not very many had a stock PCM. My car ran 11.009@123mph with the 355" LT1 and would have gotten into the 10's on the stock PCM and small cubic inches but I only made 5-6 passes before the oilpressure dropped and I built the current 383. I used the same LE heads/cam, everything except for the rotating assembly, crank, rods and pistons. Now the car ran 10.82@127mph on it's second outing. I am going to step up the cam since it was designed for my 355" LT1 engine but works good in a lower rpm 383 too. I also added a singleplane intake and a Fast management so it should be cooking soon. Later

gillbot

iTrader: (27)

i've been spinning mine to ~7200 but I think i've played with fire too much lately so I dropped it to 6900-7000 lately.

thatguy383

iTrader: (1)

e85 contains ethanol, not alcohol or methanol, there is a big difference.

ltonenewbie

TAlt1.. that is one of the sickest launch pics lol

I can't help but wonder if you would have seen 10s with more diameter. Was that the braked th350 w 4000vig at that point?

T/ALT1

iTrader: (3)

Yeah that was a t-brake TH350/4k vig. 4.10, in the picture but that was with my 383 after tightening the front shocks b/c it wheelied higher on the first pass. Here is the first pass.
I never got a chance to T-brake the 355 b/c I was just testing/tuning when the bottomend went south. I am sure it would have ran 10.90's with 123mph. Later

SPRAYED Z

iTrader: (4)

how bout 10s on a bone stock longblock, cam only with spray
That can be done if you want to.

T/ALT1

iTrader: (3)

Yeah thats doable with good suspension and 60' times. I ran 10.80's@125mph on a stone stock LT1 shortblock with LE1 heads, stock valves/ small hydraulic roller cam, boltons, stock suspension with a 150shot back about 8yrs ago. I did that with the stock 10bolt with 3.42's. I am sure if I put a stock Lt1 in my car it would run high 11's N/A so a 100shot and it would go 10's. JMO

vtec

iTrader: (1)

my car with a cam and self ported heads went a 10.14 with a 135 shot.... cant remember the mph. lol

ltonenewbie

got me thinking now lol.

custom grind + 100 shot, wonder how close i'd get

Wicked94Z

iTrader: (26)

ethanol IS alcohol. the brass inside the walbros doesn't like alcohol and the increased conductivity, that's what burns them up. I've had walbros in my car since last year, and they've done fine so far on the e85. Doesn't mean I recommend it though.

ltonenewbie

so why go that route if you know you're on borrowed time?

not flaming, just asking. did you have your eye on something e85 friendly but the walbros were cheaper?