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I have a 64 coupe with a 1969 350 cu.in.engine with a carter AFB #3721sa.While rebuilding my AFB, I noticed some people use a stainless steel shield for cooling down the carb.My intake is GM#3794129 and not a hot slot manifold.My question is,should I still use a shield to cool the carb down (living in Florida) with exhaust valve wired open.Pictures enclosed.Thank you.Alan
Do you currently have a problem or you just trying to solve one you don’t have
C'mon Keith -- you're becoming the youngest 'old codger' on here
There are two issues; exhaust gases from the intake runners causing percolation or other driveability problems - and the carb base plate corroding because of improper gaskets. But this is on an original setup. I don't think you'll have the problem with that intake...
Heat shields are usually aluminum BTW, not stainless steel... I'd try to get by without one first.
Last edited by Frankie the Fink; 03-20-2018 at 11:30 AM.
Frank a few things I learned over the years you can’t fix what’s not broken, throwing parts at a problem is a good way to waist money, trying to out smart engineers who spent years designing leada to frustration. And by all accounts my car should never make it past my mail box with its points ignition, repro plug wires, ethanol laced gas and snake oil products
I purchased the car 1 1/2 years ago and was having trouble with leaking gas from carb .Other than that it runs fairly well.I just thought while I was rebuilding it and had it off the manifold,I would check with you guys and see about any improvements and maybe prevent a problem down the road.But from the answers I have received,I think my setup should be good.And I appreciate your feedback.Thanks again,Alan
I don't think you will derive much benefit from an aluminum shield with a Carter AFB. Shields work well on Holleys to deflect heat from the intake away from the fuel bowl and the accelerator pump housing. But AFBs are more compact and not as exposed in the same way to radiant heat. If you do seem to have heat soak issues an insulated spacer under the carb will be more effective.
I live in Florida, and if it was an itch I just wanted to scratch, "I" would wire open the heat riser (or gut it, or replace with a FI spacer) AND I would block off the intake runner ports through the intake manifold.
at a minimum, wiring open the riser will add life to the passenger side exhaust...
IIRC, that is a 1 year only intake you have there (63). If you ever decide to get the correct one for your car, I will be happy to purchase that from you
I don’t know but I’d have paper towels stuffed in the bore holes and that stray piece of linkage somewhere else. That’s how motor rebuilds occur unexpectedly.
Last edited by Frankie the Fink; 03-20-2018 at 06:19 PM.
I don’t know but I’d have paper towels stuffed in the bore holes and that stray piece of linkage somewhere else. That’s how motor rebuilds occur unexpectedly.
yes, I had paper towels covering the intake openings.I agree with you.I do not want any item in the bore holes.Thank you.Alan
IIRC, that is a 1 year only intake you have there (63). If you ever decide to get the correct one for your car, I will be happy to purchase that from you
Thanks for the info on the manifold.I did not know that,but I want to keep it.Thanks,Alan
Had a problem many years ago with a 66 300hp with a cast intake and a Holley.
Needed a heat shield to stop exhaust coming up through the carb.
Purchased the heat shield from GM.
Never heard of an issue like that with an aluminum 350 hp intake.
Just my experience.
Carburetor heat shields have been around since the late 60's at least. Yes, even GM supplied them in the past. Here's a GM heat shield for a Quadrajet...
Jegs and Summit both supply them for a variety of carbs. Back in the day many of us made our own as you frequently had to work around non standard linkage and fuel lines. A thin piece of aluminum and a couple of hours and you have your own custom heat shield. Most of the time we made them for Holley's and some of the Ford Autolite carbs with the exposed fuel bowls.
Do you currently have a problem or you just trying to solve one you don’t have
sorry to say, but there are less intimidating ways to reply to an honest question as asked by the OP. For each one of us, there is always someone who is smarter, has more knowledge and more experience. We'd like to get that person's respect and elegance when confronted with our ignorance
sorry to say, but there are less intimidating ways to reply to an honest question as asked by the OP. For each one of us, there is always someone who is smarter, has more knowledge and more experience. We'd like to get that person's respect and elegance when confronted with our ignorance
I was asking a question? if he indeed had a valid problem there are ways to fix them. but like I said its hard to fix something that is not broken. he said in a latter post he drove the car for a year or so without a shield and had no problems. a problem would show up by then. you got to solve the root cause of a problem not put a band aid over it
03-20-2018, 10:25 AM
carb heat shield
C'mon Keith -- you're becoming the youngest 'old codger' on here
