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2/21/13 11:48pm - Original Message: 'Carb Spacers'
Wally71 Gold Member
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Palos Heights, IL - USA

Vette(s):
1971 LT 1 4spd Coupe numbers matching #s114893

Joined: 2/8/2013
Posts: 11
  I have considered placng a 1" spacer under my carb. I have a stock aluminum dual plane manifold on my LT 1 350 engine. does the hood have enough clearance between the stock open air cleaner? I read a article on spacers and they talked about these spacers increasing power and torque at the low to mid power band. High Velocity Heads has one ST4150-4AL that they reccomend but will it fit without hood interference. Thats the Question

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2/22/13 7:32am - Reply: 'Re: Carb Spacers'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19458
I don't think it will without going to a shorter air filter element, or a dropped filter base. The only way to know for sure is to check the clearance you have now.
You could use some modeling clay(or play-doh) on the air cleaner top, and then slowly close the hood. Open the hood, and check to see how thick the clay is, and go from there.
You can also run a straight edge across the fenders, on the lips of the fenders where the hood fits, and measure from the highest point of the air cleaner to the straight edge.


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2/22/13 9:17am - Reply: 'Re: Carb Spacers'
ebo Lifetime Member
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Holland Patent, NY - USA

Vette(s):
#1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

Joined: 6/3/2008
Posts: 4395
My Red project car came with a eldebrock performer manifold and a 750 holley double pumper carb. Previous owner had a 1 inch spacer block on the car.
Hood WOULD NOT CLOSE owner told me he never drove fast in reverse so it was never a problem Wacko 
BTW that whole set up is for sale......
Evil Smileebo


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Evil Smileebo
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2/22/13 12:49pm - Reply: 'Re: Carb Spacers'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19458
ebo said:
Hood WOULD NOT CLOSE owner told me he never drove fast in reverse so it was never a problem Wacko 



LOL
Actually...it could turn into a problem. At certain velocities driving forward, the rear of the hood could come up fast enough to flip it forward...possibly all the way off the car to the front, and then you could drive right over it. Do NOT ax me how I know this could happen....I do NOT care to discuss it any further..... Censored Angry

LOL Embarrassed


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Joel Adams
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2/22/13 1:13pm - Reply: 'Re: Carb Spacers'
anips
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sonoma, CA - USA

Vette(s):
72 LT-1 AC coupe,69 l-36 coupe

Joined: 8/9/2002
Posts: 783
if you want low to mid range power use a 4 hole spacer, if you want mid to top end power use an open spacer, the spacer tricks the motor into beleaving it has a bigger intake manifold, sometimes these spacers help sometimes not.

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2/23/13 8:36am - Reply: 'Re: Carb Spacers'
nosal1 Gold Member
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Dunedin, FL - USA

Vette(s):
1980 Corvette Torch Red with Gold metallic 370HP/350 CU.IN.Turbo 350 w/shift kit.Originally CA.Car with 305 CU.IN.

Joined: 3/21/2006
Posts: 238

If you use a spacer,any size spacer,I suggest a Phenolic type instead of aluminum for better service and performance.Test them both and the latter proved out to be the best.   God luck on the depth/height of any of them..Have a great day.



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8/8/13 2:53pm - Reply: 'Re: Carb Spacers'
C17Flyer
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Charleston, SC - USA

Vette(s):
1979 Silver w/oyster 350/290 crate motor

Joined: 8/5/2013
Posts: 11
I had to go with a 1/2" phenolic and 2" low profile filter. I've got an Edelbrock 2701 intake with a Holley 670 carbCool. It just does fit.(at least on my 79)
 
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8/8/13 7:28pm - Reply: 'Re: Carb Spacers'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 870
Wally71 said:   I have considered placng a 1" spacer under my carb. I have a stock aluminum dual plane manifold on my LT 1 350 engine. does the hood have enough clearance between the stock open air cleaner? I read a article on spacers and they talked about these spacers increasing power and torque at the low to mid power band. High Velocity Heads has one ST4150-4AL that they reccomend but will it fit without hood interference. Thats the Question


I'll be curious, as the E10 gas in my carb boils after I shut it off in these Texas summer days.  The mechanic I took it to wants to put a heat shield between my carb and the manifold.  A phenolic spacer would be even better.  I wish I had the car home so I could put a wad of clay on the air cleaner for ya.

I think the LT-1 already comes with a drop down air cleaner base.


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8/10/13 9:52pm - Reply: 'Re: Carb Spacers'
rick jay Gold Member
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Liverpool, NY - USA

Vette(s):
72 coupe, 350 4 spd, modified motor, exhaust, tires & wheels. '91 ZR1, modified exhaust.

Joined: 1/21/2003
Posts: 82
F4Gary, do you use any additives to help compensate for the E10 gas you use?  If not, I'd recommend a product called ValvTec.  Go to there website and check it out.  I get it from a local marime supply store (I believe it can only be found in a marine supply).  I use it in all my vehicles when I can't get the non-ethanol gas (72 & 91 Vette, 92 full size Blazer and a 99 Buick Regal).  You may not have experienced any issues yet with using the E10, but you eventually will.
 
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8/11/13 4:08am - Reply: 'Re: Carb Spacers'
nosal1 Gold Member
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Dunedin, FL - USA

Vette(s):
1980 Corvette Torch Red with Gold metallic 370HP/350 CU.IN.Turbo 350 w/shift kit.Originally CA.Car with 305 CU.IN.

Joined: 3/21/2006
Posts: 238

F4Gary/Rick J   I am presently evaluating a product from Lucas for counteracting the corrosive nature of Ethanol fuels and to date has improved idle,smoother idle and running.This in a '72 Chevy 1/2 ton truck I am testing. Product and will be used in my '80 Vette,'68 Camaro also.I have notice a slight increase of performance as well. I think at this time there is a marked improvement of performance,more later when more is determined.Have a great day all.                    Sal C



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8/11/13 11:58am - Reply: 'Re: Carb Spacers'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 870
Al I've put in my gas is Stabil.  I'll have to check those out.

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8/12/13 2:33pm - Reply: 'Re: Carb Spacers'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 870
OK, I got the car home (runs a lot better) and I put a wad of clay bar on top or my air cleaner, and it looks like I have about 3/4ths of an inch clearance.  Would be tight  though.  I'd probably go with a 1/2 in phenolic spacer and may be a thin heat shield too.  1 inch might be pushing it.

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8/13/13 9:05am - Reply: 'Re: Carb Spacers'
nosal1 Gold Member
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Dunedin, FL - USA

Vette(s):
1980 Corvette Torch Red with Gold metallic 370HP/350 CU.IN.Turbo 350 w/shift kit.Originally CA.Car with 305 CU.IN.

Joined: 3/21/2006
Posts: 238

I concur with the 1/2" phenolic spacer,however do not think you would have to use a heat shield wit phenolic spacer. By the way I failed to mention about testing the Lucas ethanol combative product,that I have noticed an increase in fuel economy.I have not a definative number as yet,however I drive the truck I have been testing everyday and normally have used more fuel then I have at the normal interval.I drive the same places everyday and by now I am in need of fuel and don't now..Like I say no definite MPG and will later determine next fillup etc..     Sal C



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8/13/13 12:22pm - Reply: 'Re: Carb Spacers'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 870
Hey, for me to put a 1/2" spacer under my carb, how do I lengthen the choke rod that is connected to the manifold?

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8/13/13 4:07pm - Reply: 'Re: Carb Spacers'
anips
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sonoma, CA - USA

Vette(s):
72 LT-1 AC coupe,69 l-36 coupe

Joined: 8/9/2002
Posts: 783
with a couple pairs of plyers,  best bet is to make a new one in case the spacer doesn't work out.

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