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65 throttle linkage

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Old Mar 8, 2023 | 09:57 AM
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From: Sidney Ohio
Default 65 throttle linkage

Trying to get WOT ,I've read a lot about this issue , it happens a lot . Getting under the car I cannot see the heads of the two 1/4-20 screws because of bellhousing . Has anyone had luck getting the linkage out as to free up and re-adjust per assembly manuel ? I've done all the obvious . Next step is to get the linkage out of the car .
Thank you , Bob
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Old Mar 8, 2023 | 10:11 AM
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There is a difference between 250/300 h.p. and the 365 h.p. linkage back at the firewall.
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Old Mar 8, 2023 | 10:16 AM
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I've read that , thanks .
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Old Mar 8, 2023 | 07:25 PM
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If I remeber correctly there is a difference in the actual throttle levers on different HP engines. There is a locating flat on the lever so there really is no adjustment at the firewall even if you could get to the nut and bolt. I changed my lever out from a 300HP lever to 350HP lever when I had the engine out. All the adjustent is going to be on the throttle rod between the carb and lever.

https://www.zip-corvette.com/64-65-3...tor-lever.html

https://www.zip-corvette.com/64-65-3...pt-300-hp.html

Last edited by smacota1; Mar 8, 2023 at 07:37 PM.
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Old Mar 8, 2023 | 07:52 PM
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Hi Bob! Got your email this morning and thanks.
Do you have the stock carburetor on this engine?
I am able to access the 1/4" bolts for accelerator using a 1/4"drive flat ratchet and short socket. Not easy but doable.
Problem will be removing the assembly with engine in place. If you need to free the assembly up try WD-40 into the bushing from inside foot well of car. You should be able to see the WD-40 exit the bushing on the firewall side.
Cheers!
RC
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Old Mar 8, 2023 | 09:38 PM
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Originally Posted by smacota1
If I remeber correctly there is a difference in the actual throttle levers on different HP engines. There is a locating flat on the lever so there really is no adjustment at the firewall even if you could get to the nut and bolt. I changed my lever out from a 300HP lever to 350HP lever when I had the engine out. All the adjustent is going to be on the throttle rod between the carb and lever.

https://www.zip-corvette.com/64-65-3...tor-lever.html

https://www.zip-corvette.com/64-65-3...pt-300-hp.html
EXACTLY! I collected all the parts to convert my original 300 h.p. 1965 to a 365 h.p. and there are a LOT of little things like this that are different and the $$s add up quick.
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Old Mar 9, 2023 | 08:38 AM
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Thanks RC , I'm going to get at it today . I'm using a Quadrajet , same as on the 305 I pulled out , no issue there with WOT , I have put in a 96 350 Vortec , this is where the problem lies . I'll get at it .
Thanks again , Bob
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Old Mar 9, 2023 | 09:15 AM
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Also I want to say that WOT is easily achieved by hand . My problem with this new motor , the foot pedal , when floored , it will not bring the linkage to WOT. So when the two 1/4-20 hex heads are loosened , are the two levers independant of each other . adjustable ?? I know that out of the car ,in a bench vise , I could bend the foot linkage rod back toward the seat to get WOT .The arms move freely .no binding .
Assembly manuel does not show much ,only how to make adjustment .
Back at it , Thanks , Guys !
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Old Mar 9, 2023 | 11:19 AM
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No, the connection between linkage arm and pedal rod through fire wall is not adjustable. The only adjustment is on the rod that connects carburetor to linkage arm.
Sounds like you need a shorter rod. You can purchase a shorter rod or put more threads on the rod you have, or just put a bend in the rod you have to make it shorter.
RC
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Old Mar 9, 2023 | 12:52 PM
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I have plenty of rod ajustment but when I ajust to WOT the idle is too high . I will have to remove and bend rod under pedal .
Thanks again RC
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Old Mar 9, 2023 | 03:25 PM
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I don't think you will be successful bending rod under pedal. Can you lower the connection point at carburetor?
RC
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Old Mar 9, 2023 | 04:46 PM
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I just came back in , Thanks RC , I already did that , lowered to new hole . I bent the rod , now I have WOT .
Thanks everyone ., Bob
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Old Sep 19, 2023 | 10:33 PM
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65, 327, 300hp, Carter AFB. I finally pulled the trigger on a stock snorkel, and my throttle linkage is contacting the bottom of the cleaner.
I



tried unscrewing the threaded rod a little, but the tolerances are a bit tight.
am I missing something or just needs more tweaking?


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Old Sep 21, 2023 | 11:45 AM
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Take the air cleaner base off . It should be marked where linkage is rubbing .Simply set the base on some wood blocks or whatever and tap in with small ballpeen hammer where the marks are .Problem solved . At least that is what I would do .

Last edited by 1960; Sep 21, 2023 at 11:45 AM. Reason: typing error
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Old Mar 27, 2024 | 05:52 PM
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I never could get WOT. When having clutch replacement I found the throttle linkage clamp in the tunnel so loose that it would have fallen off sooner or later. Getting to the clamp bolts from up above is near impossible.
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