Want one for power. But are there any installation tricks i should know of? Never done it before and don't want to mess off, pretty sure i'm getting the 1" spacer.

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--Steve S-- 84 Trans Am 305 (cough)LG4(cough), 5 speed, Flowmaster 80 series, otherwise an emissions restricted slow 150 hp(chilton rating) 240 torquer that needs RELEASE!!!!

P.S. Daily Driver

 

As long as the spacer preserves the separation of both halves of your stock dual plane manifold.

But, if you're wanting to install an open spacer, that would defeat the purpose of any two-plane intake manifold. Dual planes work like they do because the vacuum impulse from a cylinder draws down the volume of only half of the manifold. This causes a stronger vacuum impulse to show up across the carb giving a sharper throttle response. An open spacer would create a huge "leak" between the halves.

Of course, as RPMs get up there, along with better heads, more aggressive cams, freer flowing exhaust, THEN it would be time to go to something like a Torker or some other single plane manifold rather than an open spacer.

Do you have smog inspections where you are? If not, the easiet thing to do is to retrofit that 305 back to something resembling a 1972 engine. A plain Q-Jet with a regular non-CCC HEI distributor. Do you have one of those hideous pellet-bed cat converters? Trash it and put a Catco or some other free-flowing cat in. Go check out the Exhaust BBS on this website for more ideas.

Your 305 is not that far removed from the good ol' pre-smog days. Take advantage of that.

[This message has been edited by jrr (edited January 09, 2001).]

 

Yah i have smog inspection, but only visual. I'm going to take it off for inspection so i'm not too concerned about it. Is the LG4 intake manifold a dual plane? The carb spacer is open and can suport Holleys, which i think it was intended for even though i have the stock computer controlled Quadrajet.

I'm just looking to this as a quick fix for higher-rpm driving. I'm getting the catalytic converter gutted today too...

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--Steve S-- 84 Trans Am 305 (cough)LG4(cough), 5 speed, Flowmaster 80 series, otherwise an emissions restricted slow 150 hp(chilton rating) 240 torquer that needs RELEASE!!!!

P.S. Daily Driver

 

A great way to gut a monolith, brick-type, cat converter is to take a pipe that just small enough to slide into the cat and drive it from one end to the other. I've gutted four cats that way but I ground the end of the pipe to be real sharp. It's just like coring an apple.

That AIR pipe in the middle of the two bricks may cause problems, though. Just drive from one end, then the other. Let the cored pieces come out then cut out that AIR tube if you want.

Another exhaust trick is to remove the AIR manifold from your exhaust manifold and pull each of the air injection tubes out. Then put the AIR manifold back on. Those injection tubes stick into the exhaust stream and just get in the way.

Leaving the AIR manifold in place is good for appearances as well as a bogus cat!

I'm still not too sure about putting an open spacer atop a stock dual-plane intake. I think that would cause fuel distribution problems. I'm sure somebody has done a study on that.


[This message has been edited by jrr (edited January 10, 2001).]

 

[This message has been edited by 84TransAm (edited January 10, 2001).]

 

I bet you dont notice much improvement on that lg4.it might even be worse.and what you might gain in some ares you will lose in others.

 

yeah get a phenolic one it some kind of wood so it wont transfer heat and also get some longer studs.

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1989 firebird formula

Mods: converted from T.B.I. to a carburator 305 to a 350. Flowmater exhaust,hedman shortie hedders,202 heads,350 horse cam,bored.40 over, Edlebrock torker2 intake.

Future mods 400 performer rpm intake (polished) and 600 edlebrock carb, comp roller cam, and way better heads. orpossibly a 383 stroker?

 

Definately stay away from an open-hole spacer period. Matter of fact don't bother with any kind of spacer until you upgrade your stock intake manifold, then the 4-hole spacer will add significant bottom end, or a dual-plane (two-hole) spacer will soften the bottom end with usually a bit more on the top end. That's a general guideline but everything always depends on your final combo.
good luck,


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White 1986 Irocz, 305/383 with Edlebrock Performer-RPM intake and Performer #1407 carburetor, +110hp shot of crack, 700R-4 tranny, 3.25:1 rear, Mcreary Road-Stars, single 3" Borla exhaust, Linginfelter-TPI camshaft pulls 17" vacuum solid. N/A runs 10.9 @124, Crack-runs 10.3 @135... haven't run at track since Oct-99

 

In addition to the above:

Holley spacers don't fit Q-jets (actually square bore don't fit spread bore) unless they are double threaded to fit both.

Also, the stock air cleaner sits rather high as it is. There are plenty more perfomance modifications before you get to the niddy-griddy 5 HP stuff. The electric fan idea you had was start.......
.

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1984 WS6 Trans Am Hartop
Former L69 Car under restoration
1984 Trans Am T-tops
4-bolt main 350, performer intake, headers, Holley 650, T-5, hayes clutch, dual elec. fans and 3.23's.
Daily driver and restoration
13.98 @ 101