Does this tbi adaptor plate look right? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cr92 · 05-20-2014, 03:55 PM

just installed my rochester 4bbl intake manifold to tbi adaptor plate and it does not seem to line up correctly with the holes in the manifold. anyone ever installed one of these ? dont seem right having a portion of the original holes in the manifold partially blocked by the spacer....

Jonboy · 05-20-2014, 04:53 PM

nope. Maybe try turning it around?

mrolds88 · 05-20-2014, 05:35 PM

Now I know why I got one off of a 454..

gonecountry · 05-20-2014, 05:51 PM

Yes I think you have to put the ports in the adapter over the large area of the intake for the secondaries

cr92 · 05-20-2014, 06:19 PM

this seemed to be the only way it would bolt on... will check again tomorrow maby i overlooked something simple

Tx Firefighter · 05-20-2014, 07:55 PM

Quote:

Originally Posted by mrolds88

Now I know why I got one off of a 454..

Agree. If you can handle the extra height it gives, the 454 piece is an example of fine GM quality that fits perfect.

mrolds88 · 05-20-2014, 11:35 PM

Mine just happens to be going on a 403 Olds too.

Katrina/10 · 05-21-2014, 07:47 AM

The throttle body goes over the secondary holes in the intake.

cr92 · 05-21-2014, 12:23 PM

just went out and tried to switch it around... it only bolts on like shown in the picture... will not bolt on or even come close to bolting on any other way... what am i missing? the engine was a 79 chevy 350 with a 4 barrel carb on it, did they send me the wrong one i wonder? all it says on the receipt is Adaptor Front Mount QJET SB T

heres the one i bought from summit http://www.summitracing.com/parts/trd-2208

Katrina/10 · 05-21-2014, 01:15 PM

Sorry if I gave you incorrect info, the only TBI adapters I have ever seen go over the rear of the carb intake. If it only fits one way, yours must be different. Contact Summit? Maybe that's the way it's intended to be used, but looks restrictive.

geezer#99 · 05-21-2014, 02:09 PM

Pop your adaptor off and take a pic of your intake for us.
Not all rochestor intakes are the same.

cr92 · 05-21-2014, 02:22 PM

il get a pic.... the gasket they included fits perfect around the intake is the strange part!

cr92 · 05-21-2014, 03:45 PM

wrong adaptor???

Man that 454 one looks nice..

y5mgisi · 05-21-2014, 09:09 PM

That particular adapter is just not meant to work with that particular manifold. THat, or someone built the adapter backwards.

cr92 · 05-22-2014, 11:43 AM

the bolt holes line up when laid on the manifold in either direction, but the air holes do not line up at all... did i order the wrong plate on summit or is this just an error on there behalf?

y5mgisi · 05-22-2014, 08:31 PM

Wrong plate for your application.

cr92 · 05-23-2014, 11:29 AM

so which plate should i have ordered? it said small block chevy quadra jet spread bore to TBI... this is what was on my engine? i can't see this being square bore? and the gasket fits perfect i think they sent me the wrong plate with the right gasket... I'm just wondering should i be under the impression they made a mistake when i call or was i the one who made the mistake?

geezer#99 · 05-23-2014, 01:33 PM

I'm afeared you mighta got the wrong one.
Look here.
http://www.customclassictrucks.com/t.../photo_19.html

That plate would work on an eddy performer 2101 though.
Call Summit. Explain the situation. Not like they haven't seen mistakes made before.

05-20-2014, 03:55 PM	#1
cr92 Registered User Join Date: Apr 2014 Location: NL Posts: 54	Does this tbi adaptor plate look right? just installed my rochester 4bbl intake manifold to tbi adaptor plate and it does not seem to line up correctly with the holes in the manifold. anyone ever installed one of these ? dont seem right having a portion of the original holes in the manifold partially blocked by the spacer.... Attached Images

05-20-2014, 04:53 PM	#2
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: Does this tbi adaptor plate look right? nope. Maybe try turning it around? __________________ 1974 Jimmy- 5.3/4L80e/NP241

05-20-2014, 05:35 PM	#3
mrolds88 Registered User Join Date: Jul 2011 Location: WV Posts: 946	Re: Does this tbi adaptor plate look right? Now I know why I got one off of a 454.. __________________ 72 GMC C2500 402/Th400 first truck (still have) 77 GMC C3500 CC dually Sold 70 C50 dump truck "Rusty" 87 K10 Suburban Sold 93 K2500 xcab 6.5TD 96 GMC K2500 Suburban 6.5 TD

05-20-2014, 05:51 PM	#4
gonecountry Registered User Join Date: Jul 2013 Location: Nova Scotia, Canada Posts: 20	Re: Does this tbi adaptor plate look right? Yes I think you have to put the ports in the adapter over the large area of the intake for the secondaries __________________ 1977 Sierra Long stepper 1986 Silverado swb 355 700r4 SOLD 1979 Sierra Grande 4x4 swb 350 4 inch lift SOLD

05-20-2014, 06:19 PM	#5
cr92 Registered User Join Date: Apr 2014 Location: NL Posts: 54	Re: Does this tbi adaptor plate look right? this seemed to be the only way it would bolt on... will check again tomorrow maby i overlooked something simple

05-20-2014, 11:35 PM	#7
mrolds88 Registered User Join Date: Jul 2011 Location: WV Posts: 946	Re: Does this tbi adaptor plate look right? Mine just happens to be going on a 403 Olds too. __________________ 72 GMC C2500 402/Th400 first truck (still have) 77 GMC C3500 CC dually Sold 70 C50 dump truck "Rusty" 87 K10 Suburban Sold 93 K2500 xcab 6.5TD 96 GMC K2500 Suburban 6.5 TD

05-21-2014, 07:47 AM	#8
Katrina/10 Registered User Join Date: Oct 2010 Location: Ocean Springs, MS Posts: 1,746	Re: Does this tbi adaptor plate look right? The throttle body goes over the secondary holes in the intake. __________________ Gary 1971 Chevrolet C/10 1951 GMC 100 1977 GMC C15 1955 Chevrolet 3100

05-21-2014, 12:23 PM	#9
cr92 Registered User Join Date: Apr 2014 Location: NL Posts: 54	Re: Does this tbi adaptor plate look right? just went out and tried to switch it around... it only bolts on like shown in the picture... will not bolt on or even come close to bolting on any other way... what am i missing? the engine was a 79 chevy 350 with a 4 barrel carb on it, did they send me the wrong one i wonder? all it says on the receipt is Adaptor Front Mount QJET SB T heres the one i bought from summit http://www.summitracing.com/parts/trd-2208

05-21-2014, 01:15 PM	#10
Katrina/10 Registered User Join Date: Oct 2010 Location: Ocean Springs, MS Posts: 1,746	Re: Does this tbi adaptor plate look right? Sorry if I gave you incorrect info, the only TBI adapters I have ever seen go over the rear of the carb intake. If it only fits one way, yours must be different. Contact Summit? Maybe that's the way it's intended to be used, but looks restrictive. __________________ Gary 1971 Chevrolet C/10 1951 GMC 100 1977 GMC C15 1955 Chevrolet 3100

05-21-2014, 02:09 PM	#11
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,542	Re: Does this tbi adaptor plate look right? Pop your adaptor off and take a pic of your intake for us. Not all rochestor intakes are the same.

05-21-2014, 02:22 PM	#12
cr92 Registered User Join Date: Apr 2014 Location: NL Posts: 54	Re: Does this tbi adaptor plate look right? il get a pic.... the gasket they included fits perfect around the intake is the strange part!

05-21-2014, 03:45 PM	#13
cr92 Registered User Join Date: Apr 2014 Location: NL Posts: 54	Re: Does this tbi adaptor plate look right? wrong adaptor??? Man that 454 one looks nice.. Attached Images

05-21-2014, 09:09 PM	#14
y5mgisi Second Chance Program Join Date: Jun 2006 Location: Portland, OR Posts: 2,642	Re: Does this tbi adaptor plate look right? That particular adapter is just not meant to work with that particular manifold. THat, or someone built the adapter backwards. __________________ 90 Chevy Suburban 2500 5.3 swap/th400/np241/14bltSF/10blt. 77 C20 crew cab Silverado. 396/th400. In work.

05-22-2014, 11:43 AM	#15
cr92 Registered User Join Date: Apr 2014 Location: NL Posts: 54	Re: Does this tbi adaptor plate look right? the bolt holes line up when laid on the manifold in either direction, but the air holes do not line up at all... did i order the wrong plate on summit or is this just an error on there behalf?

05-22-2014, 08:31 PM	#16
y5mgisi Second Chance Program Join Date: Jun 2006 Location: Portland, OR Posts: 2,642	Re: Does this tbi adaptor plate look right? Wrong plate for your application. __________________ 90 Chevy Suburban 2500 5.3 swap/th400/np241/14bltSF/10blt. 77 C20 crew cab Silverado. 396/th400. In work.



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05-23-2014, 11:29 AM	#17
cr92 Registered User Join Date: Apr 2014 Location: NL Posts: 54	Re: Does this tbi adaptor plate look right? so which plate should i have ordered? it said small block chevy quadra jet spread bore to TBI... this is what was on my engine? i can't see this being square bore? and the gasket fits perfect i think they sent me the wrong plate with the right gasket... I'm just wondering should i be under the impression they made a mistake when i call or was i the one who made the mistake?

05-23-2014, 01:33 PM	#18
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,542	Re: Does this tbi adaptor plate look right? I'm afeared you mighta got the wrong one. Look here. http://www.customclassictrucks.com/t.../photo_19.html That plate would work on an eddy performer 2101 though. Call Summit. Explain the situation. Not like they haven't seen mistakes made before.

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