I put a 750 double pumper on a slant six once........ I put a Thermoquad on a slant six once. Man, when you floored that TQ on the slant, it was the biggest BWWAAAAAAAAAAA sound you EVER heard
How big of a 4 barrel on a stock 1970 318?
- Thread starter David Eldridge
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j par
Well-Known Member
Wwoooooooooopp.....I put a 750 double pumper on a slant six once........ I put a Thermoquad on a slant six once. Man, when you floored that TQ on the slant, it was the biggest BWWAAAAAAAAAAA sound you EVER heard
1st bigger carbs dont equal more fuel.
2nd I agree with everyone around 600 cfm give or take 50 for your car.
3rd generally for a small block 400 + hp = 750 and 350 - hp = 650 . Now in between can go either way. Now under 200 hp you can make an argument for a 550. And for some race only and or big inch 850 +.
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I'll tell you. First I HATE them. Now for the why.
Go out in a nice crisp mornin and bust it off. Starts nice, real quick and stays runnin. Warms up and the choke knocks off. Everything is right with the world. Lets say you're off work this day (whoo hoo) and you're goin to Lowes to pick somethin up for a home project.
You're in JUST long enough for the CHOKE to cool back off, but the engine is fine. Come back out, bust it off and the choke is on......again, when the engine is warm.
That's why I don't like electric chokes. They work when you don't want or need them to. In fact, this reminds me that I need to go out and put the manual choke cable on my truck. lol
j par
Well-Known Member
Apparently experiences May differ on this? I've never had that happen more than just maybe having to rekick it down or something and maybe let it high idle for a few seconds but nothing extremely irritating like it stays on for another half hour or something while it's warm.
Could be. Then, it could be the warm climate we have here, too. I just like having more control over it.
You could just put a kill switch on it.
j par
Well-Known Member
Yeah I was kind of thinking if there was a problem with it that one could just go out and pull the wire LOL but now that you say that, a $2 switch would probably do it?
j par
Well-Known Member
Of course unless I got that backwards that cutting the electricity would give me full choke all the time LOL
That's certainly an option I had not thought of.
chryslerfat
Well-Known Member
Up here in cold country I prefer a properly adjusted electric choke. Up here you would have to sit a loooong time for the choke to come back on because the heat radiating from the engine will hold the choke open. I do however run my race cars and summer only cars with the choke turned all of the way open.
dibbons
Well-Known Member
What happened to the chokes you could adjust? Or were those GM products? You could loosen some screw(s) and turn a black plastic housing and fix it up anyway you wanted (adjust seasonally or for local climate, etc.) I know they were not electric, but that system would be handy on any choke. What am I talking about? A manual choke would solve all of this nonsense forever, right?
71DodgeDemon340
Well-Known Member
When its 35 or below mine will stay on a slightly fast idle for about 10-14 miles around town before it actually drops to idle. It will be at 1100 ish until i drive it enough and then drops back down to 850-900 ish. 4speed tho so really doesnt bug me, boy does that 340 love that cool crisp air lol
Id say a 500 cfm would be enough. If you had a eddy intake like a performer rpm and headers id consider maybe going up to the 600. Too big a carb is a issue to look out for, we put a 800 cfm on my 340 when it was on the dyno, didnt like it one bit, put the 650 on it and loved it, ended up getting 400/400 on the dyno
Id say a 500 cfm would be enough. If you had a eddy intake like a performer rpm and headers id consider maybe going up to the 600. Too big a carb is a issue to look out for, we put a 800 cfm on my 340 when it was on the dyno, didnt like it one bit, put the 650 on it and loved it, ended up getting 400/400 on the dyno
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Marcohotrod
Well-Known Member
Carter or Edelbrock 500 afb. had 1 on my stock 1969 318 Dart with 360 exhaust manifolds and dual exhaust and a edelbrock streetmaster intake. out dragged a 350 camaro with headers and wide rear tires and chrome valve covers
David Eldridge
Well-Known Member
Thanks for all the input everyone. I definitely going with an Edelbrock Thunder Series AVS. Lots of tuning options that way. Sounds like a 650 is the way to go seeing that Edelbrock doesn't list a 600 anymore
stroked340
Well-Known Member
Holley 600..can't get any simpler then one of them..
that 650 thunder has a good reputation. Performs right from the box. 318 will like it, and so would a 360. Good choice.
the PN 1406 has been mentioned several times....600cfm IF you want an edelbrock
Edelbrock 600 cfm - Electric Choke - Satin Finish
I think that's a very smart choice. While it maybe a "little big" it can be tuned easily and will leave you with a good bit of room to grow if you decide to swap engines down the road.
stroked340
Well-Known Member
Edelbrock carbs= garbage!!!
Cockroach.
71DodgeDemon340
Well-Known Member
Get a holley if you want to adjust it every week. Ive had the eddy thunder series avs carb on my 340 for 5 years and only have had to adjust idle speed thats it. The edelbrock is way more street friendlier than the holley
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stroked340
Well-Known Member
Obviously you DON'T know how to tune one..most people who bad mouth Holleys don't..
stroked340
Well-Known Member
douchebag
Glad we understand each other.
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