85 burb meets 6.0 lq4

[68GMCCustom]

how much more you need?

[85burb]

Intake manifold and figure out the exhaust crap. It get it in. But if all stays the same at work i will be putting cam in. Gm HOT CAM is what i have planed so far. Also need all the small crap like hoses and MAP sensor. What map sensor are you going to use with yours?

[68GMCCustom]

Not sure with this intake...but the MSD does have a input for it. You're getting the Performer intake aren't you?

[85burb]

Pretty sure i getting single plain. What ever one that is. Looks ten times better. Seems to have faily good low end still. Should be around 400 ft lbs of tq at 2200. The instructions do not say what one you need. I guess i will have to call them next week to see what one they say to use.

[68GMCCustom]

you've got a lot of weight with that sub though...and a dual plane makes much better torque then a single plane. And for what you'd gain up top with the single plane...I don't think up top its worth what you'd loose down low...and the dual plane wouldn't loose as much up top as the single plane does down low. Lets face it....you're not going to be turning that motor near 7k rpm all the time, if at all...but you will be running from idle to 4500rpm...most of the time. That LQ4 doesn't really need to turn more then 6500 or so. I don't plan on twisting my LY6 more then 6800.

[85burb]

I know im not going to go 7k all the time. I have just never seen any dyno runs with duel plain manifolds yet. Wish i had some to compair. It has a 18-2000 stall converter so will get up in rpm pretty fast. I really dont want to put the duel plain on if it will fall on its face at like 4000. Am not set one way or the other yet. Looked like the single plain followed the efi manifold almost perfictly. Would like to see motor with both manifolds dyno with no other mods.

[68GMCCustom]

Well, the Victor's operating range is:
VICTOR JR. LS1 CARBURETED OR COMPETITION EFI FOR GM GEN III (3500-7500 rpm)



and the Performer RPM is:
offering maximum power and a broad torque curve from 1500 to 6500 rpm.


...this is why I have waited for the LSX dual plane. How many rpm below the rated range would I be with a SP? 2000? Unless you are going for all out race mode...you're better off with the dual plane. Specs are the same for the LSX DP intake, so max rpm would only be 300rpm over its "rated" range.

[85burb]

I do see you point. The duel plain is just so horible looking. Would like to see dyno still. So if the single plain has about 400 tq at 2200 what would you guess the duel plain would gain there? I plan to set rev limiter at 5800-6000. Think 5800 is factory. I will have better springs in it of course. Think that is a pretty safe rpm. problay wont see that often. Dosent the govener in trans mission set shift point any way unless you are in manual shift mode (moving lever manualy).

[68GMCCustom]

Yes the trans will shift way earlier then redline w/o modification. Your LQ4 has a 5800 redline and a 6000rpm fuel cutoff. I'd guess you'd be OK to up the cutoff to 6200 or so and when racing shift 1-2 at 6000 and 2-3 at 5800. I ran my LQ4 in my '01 Sierra C3 up to 6000 (after tune) quite a bit since the 4L60HD has such a rpm drop for the 1-2 shift.

My guess is that you might loose 3-5% power in the upper range with a dual plane vs single....but will gain 7-10% in the lower to mid range....well worth the swap.

Jim? Your thoughts?

[85burb]

Will have to look up what govener they put in. May be the corvette one. Not sure. Yes more opinion will help. Dont get me wrong i trust what you say 68.

[68GMCCustom]

hey I'm no expert! and advice is what you pay for it.....
I do however prefer to steer people the right way if I have an opinion on the subject.

[85burb]

I do remember in school i built a 400 hp sbc (at wheels) and teacher told us that the duel plane made about 25 or so more horses. We could choose single or duel plain. Every one chose the RACING single plain of chorse. Only one picked the duel and the made the most power. They also had the worst upgrades. We did heads and cam swap. Dont remember what cam but used prety stock vortec heads. I guess i will try the duel plain. I also found out my trans has corvette govener in it. Not sure what diff it makes but i think it shifts higer.

[68GMCCustom]

I plan on adding a floor shifter (and a tilt wheel)...so I can shift manually (w/o miss-shifting and putting it in N ) when I take it to the track. Problem is that $500 needs to go towards my cam and stuff.

[85burb]

Cam, lifter, spring kit i am getting is 550 i think. Plus gaskets. So dang pricy. I guess it should be worth it. I am going to get all the swap parts befor i get the cam stuff. So if any thing goes south i can have it in.

[68GMCCustom]

Gave up on ECE today and ordered drop spindles from CPP. Should be here in a week....we'll see.

[85burb]

Thats cool. We never used drop spinles when we dumped wifes 68. Got 6 inch drop coils and cut 2 coils off. Still road ok and tires wore great. Could not rotate due to size and had them on for 3 year and never got any kind of funny ware pattern. Tiny bit of fethering twards the end. Broke off one of the u bolt deals that holds lower control arm on. Did not re align after replace ment.

[85burb]

Should i get a carb spacer? On of them fancy ones with 4 holes that tapers all 4 into one.

[68GMCCustom]

depends on the intake you go with?

[85burb]

The duel plane. Says makes carb flow up to 110 cfm more. I was thinking that will help make up the difference in my small carb.

[68GMCCustom]

I put one on my 383 and it seemed to like it.

[85burb]

You put one like that or a different type. Our 68 had on and it ran good. Never actually drove one befor and after install. Would you say the tapered hole kind or the open one is better? That one in pic is about $170 would it be worth that? Heard they help with low end power.

[68GMCCustom]

I bought one from Summit that had an aluminum frame and plastic inserts....so you could run it open, split, or ported. It wasn't that expensive either.

[85burb]

I will have to look of one like that. Sounds cool.

[68GMCCustom]

My intake is finally on its way!!! I can't wait to see it!

Kurt,
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[85burb]

YAY how exciting. I will be ordering mine next week. Not the GM one too pricy and dont think they make a duel for my heads. I also found that carb spacer with 3 different incerts for it. May also get that.