87TPI350KID

Simple what will i run setup.

400 sbc bored .30 (406)
8.5:1 compression
fresh bottom end
882 heads ported
lg4 intake ported
stock quadrajet
shorty headers

Pretty much what he did was take the 305 out, and put a 400 underneath it.

Think he should drill steam holes in the 416 heads and use those?

After a few paychecks he plans on running a dual/plane intake with a holley 670. Any radical changes to expect?

GTA matt

iTrader: (1)

The 8.5 compression matched with the Lg4 intake won't exactly be a powerhouse. You never mentioned a cam so I will assume slightly larger then stock. In a thirdgen i would say low thirteens.

Not sure on the steamhole issue.

87TPI350KID

How could I forget the cam.

.480/.480 lift
230/230 duration at .500
comp cams CS 280H-10

car is gutted with only 2 front seats, no carpet, no a/c, no smog.

the 416 would need steam holes to run on the 400, but it has 58cc chambers which would bump the compression up to 10.5:1 with the same size valves. So the debate is where to get the power, top end flow with 76cc heads, or much higher compression.

327???

from what i understand, ported 416's outflow ported 882's by a pretty good margin.

five7kid

iTrader: (14)

Those heads are probably going to keep you in the 15's.

The intake and cam aren't well matched, either.

mw66nova

iTrader: (13)

the 416 will flow way better than those 882's ever will, though i've already told you that. 10.5:1 c/r with a better cam and a good dual plane intake (like a performer RPM or Holley Street Dominator p/n 300-36) would work really well with a 750 double pumper. don't worry, a properly tuned double pumper would get better drivability than that 670 VS and would work way better on the track. a cam like what i'm running would be best honestly. a crane powermax solid lifter cam 238*/248* @ .050 .480"/.500". while it's not the cheapest combo in the world, it's still far cheaper than other combos and will put you solidly in the mid/low 12's with a good converter/gear combo.

87TPI350KID

thanks for the info
this is his only car, so a converted and dp are prob out of the question.

Obviously the intake sucks, but its better than the stock truck intake. The carb sucks, but hes just using it because it works and he wants to make sure the motor runs.

I talked to him about the cam, he keeps debating between 4 of them. He told me under .480. I believe thats all the stock style spring can handle.

As for the heads, they suck. But he doesn't have much cash lying around, so he'll get to it when he can. He's looking for some l98 heads, drill steam holes, voila. I can find a dual/plane intakes on ebay for about 100 bucks. Anything is better than the stocker. As for the carb, we need to go some what economical and flow enough cfm for the motor. I calculated somewhere in the 650cfm-700cfm range.

mw66nova

iTrader: (13)

with a 350 with much bigger cam, heads, a 4000 stall converter and 4.10's with a 28" tall tire, i managed to knock down 15/21 city/hwy with a 750 double pumper. you're not gonna do much better than that with a q-jet.

87TPI350KID

dang, he was getting 8 mpg with his 305 haha.

I told him not to worry about it. I told him its worth it to let those secondaries flow when he hits the go pedal.

btw, this is superbean of IZ. Names Randy.

mw66nova

iTrader: (13)

nice to officially meet you Randy, now that i've been talking to you on both boards for months now, lol!

87TPI350KID

haha, so when are you gonna build me a killer tree of five

I'm almost done porting my 416 heads, i want you to check them out. I still need to decide on a cam/intake for that 400 i was talking about.

mw66nova

iTrader: (13)

you come down to GA and we'll build ya something killer! yeah, just PM me pics of the heads and we'll go from there.

87TPI350KID

I'm taking a mild approach to them. im not messing with the valves, but I am smoothing the lip around the spark plugs, all casting lines in the exhaust ports, and gasket matching the intake. Have you noticed on some heads, where there is a stud for the valve covers, there is an obstruction in the way about 2 nickles thick? That alone should even out the runner volume for each cyl. even if it doesnt help flow that much, which it should a little, it should even out the flow and make each cyl run more consistently.

mw66nova

iTrader: (13)

make sure you focus on the bowl area behind the valves and the exhaust side more than the intake runners. while you have the valves out, put a back cut on the back of them...oh so worth it!

87TPI350KID

I don't have a spring compressor

Got any good links to show how to put a backcut on the valves?

Edit: Just found this, it would work I beleive?..
http://www.partsamerica.com/ProductD...tnumber=T70034

mw66nova

iTrader: (13)

you really need to take those things apart, i'm sure they need a valve job and new valve seals...but if no valve job, just make sure you don't nic the valve seats (not easy for the beginner, or even someone with experience.)

as far as that compressor you showed me...i gotta be honest, i'm not sure exactly how it works, though it's cheap enough. here is one that would work just as good if not better:
JEGS High Performance - JEG'S Stud Mounted Valve Spring Compressor

no links on backcutting valves, but i bet if you googled it, you'd find a ton of info!

87TPI350KID

im pretty sure i didnt nic the valve seats. can u find an image and show me where to not port lol

mw66nova

iTrader: (13)

https://www.thirdgen.org/forums/tech...-pictures.html

read all of that and learn how to get stock vortec flow numbers from 416's.

87TPI350KID

cool, thanks. These heads should be pretty good considering they were practically free.

Orr89RocZ

iTrader: (20)

now thats what i'm talkin about! thats a good combination of parts and tuning.
thats not too far off my L98!! i'm around 17/23ish.
i got some 383-406 ideas in my head and hopefully by next year i can start them up. i think you'll like them

mw66nova

iTrader: (13)

haha, and a very light right foot! with the holley on top though i could still somp on it and watch the numbers go up on the speedo (digi speedo) watch the tach flash up and watch the gas guage go down...that's kinda depressing, lol!

87TPI350KID

haha

How the heck do I get these retainers off the valve springs? I'm real eager to start on the bowls today.

87TPI350KID

Well, the 400 is in the car

No official times yet, but on the long strech of abandoned road we hit 110, the best we could hit with the lg4 was about 80.

It still has the open diff rearend with 2.73 gears in it and does a 1 wheel peel like no tommarrow.
Some 3.23 posi gears are going in this week and should launch hard, really hard. I would put 20 bucks that this thing would take my 350 tpi.

mw66nova

iTrader: (13)

sweet action bro! keeps us updated with some real track numbers soon!

87TPI350KID

3.23s are in...

Now the weak link is the 700 automatic.

Seems like a good setup. VERY VERY stong bottom end torque from the 400 mixed with mild gears makes an awesome street car. Pulls real similar to my tpi car. Has quite a bit more top end than my tpi however, it pulls to about 5k before you feel it not pulling as hard.

btw, it does good doughnuts two. Now we should put the fenders and hood on with some exhaust before we get in too much trouble.

87TPI350KID

Nova, your 305 runs good because of its gearing. I'm just wondering if we should use the stock stall since this thing makes gobs of torque, or should we use a mild 2400 stall? Its power range is from idle to about 5200, cam is good for idle to 5500.

It feels like this
Ok im going, hold on, slowing down, nothing, shift, hold on, nothing, shift hold on nothing lol

mw66nova

iTrader: (13)

i would run a 2400 and see what she likes, however Butt-Dyno is not a good way to tune it, get it to the track after every major change to get real data.

five7kid

iTrader: (14)

Shift sooner.

You're probably floating the valves. These are the 882 heads, right? 280H cam? Stock springs?

Valve float city.

mw66nova

iTrader: (13)

nah, he put the 416's on it with new springs.

87TPI350KID

416, roller rockers, 1.94 intake, 1.5 exhaust valve, behive style springs, smoothed plug holes in the chamber (about 60cc now), bowl blended, opened up intake, and exhaust ports.