Question about stock 400 4bbl intake manifold - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer Question about stock 400 4bbl intake manifold

Print Thread

Question about stock 400 4bbl intake manifold #651144 03/25/10 06:54 PM 03/25/10 06:54 PM
Joined: Aug 2009 Posts: 1,878 Detroit, MI GetAwayDriver OP top fuel
GetAwayDriver OP top fuel Joined: Aug 2009 Posts: 1,878 Detroit, MI	Hello. I'm finally swapping the crummy 2bbl from my '73 400 (Dodge Truck). I was given a scummy ol' 400 Thermoquad intake from a '78 engine. Question is, how do I deal with all the 70s emissions garbage? I don't have an EGR, so can I just make a thick steel block-off, squirt a lil RTV and call it a day? Should I do anything with whatever this junk is on the intake floor? Fill the hole? (holes?) Your thoughts? Also, should I open-up the carb adapter to equal the Thermoquad size with a die grinder? (I'm using a Carter 4bbl, so the adapter is required on the TQ intake) Or not worth the effort? (Drag performance is not the reason for the swap, just reliability)

Re: Question about stock 400 4bbl intake manifold [Re: GetAwayDriver] #651145 03/25/10 07:49 PM 03/25/10 07:49 PM
Joined: Aug 2003 Posts: 751 St.Clair Shores, Mich bryansgarage super stock
bryansgarage super stock Joined: Aug 2003 Posts: 751 St.Clair Shores, Mich	Make a plate and block the EGR port off. I welded up the holes down inside and my 400 didn't run as well, swapped to another stock intake and it was fine. Now I run a Edlebrock aluminum and it doesn't have the holes....Hmmm!

Re: Question about stock 400 4bbl intake manifold [Re: bryansgarage] #651146 03/25/10 07:50 PM 03/25/10 07:50 PM
Joined: May 2005 Posts: 2,295 dark side of the moon D Dougsmopars top fuel
Dougsmopars top fuel D Joined: May 2005 Posts: 2,295 dark side of the moon	I'd scrap it and find an older 383 intake. Or get an aluminum one.

Re: Question about stock 400 4bbl intake manifold [Re: GetAwayDriver] #651147 03/25/10 07:56 PM 03/25/10 07:56 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Yes just make a plate & block it off and if the protrusion on the left side can be unscrewed/tossed then yes as it restricts flow. the holes left over are not a problem in your stock app. On the flat thin metal adapter plate for a square bore carb on a spreadbore intake the adapter plate needs to cover the bowed out area on the intake for the spreadbore type (TQ) carb. What area on that are you inquiring about? live every 24 hour block of time like it's your last day on earth

Re: Question about stock 400 4bbl intake manifold [Re: bryansgarage] #651148 03/25/10 08:03 PM 03/25/10 08:03 PM
Joined: Aug 2009 Posts: 1,878 Detroit, MI GetAwayDriver OP top fuel
GetAwayDriver OP top fuel Joined: Aug 2009 Posts: 1,878 Detroit, MI	Quote: Make a plate and block the EGR port off. I welded up the holes down inside and my 400 didn't run as well, swapped to another stock intake and it was fine. Now I run a Edlebrock aluminum and it doesn't have the holes....Hmmm! Ok, good advice. What about removing the big piece of crap sticking up off the intake floor and just leaving the hole? Looks like it has a bolt head on it. Anybody know what that thing is for?

Re: Question about stock 400 4bbl intake manifold [Re: RapidRobert] #651149 03/25/10 08:11 PM 03/25/10 08:11 PM
Joined: Aug 2009 Posts: 1,878 Detroit, MI GetAwayDriver OP top fuel
GetAwayDriver OP top fuel Joined: Aug 2009 Posts: 1,878 Detroit, MI	Quote: Yes just make a plate & block it off and if the protrusion on the left side can be unscrewed/tossed then yes as it restricts flow. the holes left over are not a problem in your stock app. On the flat thin metal adapter plate for a square bore carb on a spreadbore intake the adapter plate needs to cover the bowed out area on the intake for the spreadbore type (TQ) carb. What area on that are you inquiring about? Thanks, I was posting while you replied on the air-flow restricting junk. My spacer is thick, maybe a little over 1/4". Now that I think about it, I can't see any advantage to removing material and matching the spread bore. The carb is a spread bore, but no where near the same difference between bores as the thermoquad.

Re: Question about stock 400 4bbl intake manifold [Re: GetAwayDriver] #651150 03/25/10 08:37 PM 03/25/10 08:37 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: The carb is a spread bore, but no where near the same difference between bores as the thermoquad. W you using a non Mopar spread bore carb mock it up & make sure the outer perimeter flange area covered by the gasket is wide enough so no vac leaks & you're set. live every 24 hour block of time like it's your last day on earth

Re: Question about stock 400 4bbl intake manifold [Re: RapidRobert] #651151 03/25/10 09:02 PM 03/25/10 09:02 PM
Joined: Aug 2009 Posts: 1,878 Detroit, MI GetAwayDriver OP top fuel
GetAwayDriver OP top fuel Joined: Aug 2009 Posts: 1,878 Detroit, MI	Quote: Quote: The carb is a spread bore, but no where near the same difference between bores as the thermoquad. W you using a non Mopar spread bore carb mock it up & make sure the outer perimeter flange area covered by the gasket is wide enough so no vac leaks & you're set. Should be good, I've put these carbs on Thermo intakes a zillion times, but not for a decade, so I'm as rusty as that intake. Thanks

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1