Help carb'ed 302 /efi 302

sins23 · September 9th, 2007, 05:49 PM

So i bought a mustang ....

1995 Mustang (non/GT)
the previous owner swapped in a carb'ed 302 out of a truck or something...

Problem is the block is shot, oil and coolant shooting everywhere.

I have an EFI 302 out of a lincoln Continental.

My question is.... since i have 2 complete engines, what do i need to convert the EFI 5.0 into a carb'ed 5.0.

reason is he cut the harness to shreds and rather than finding a new harness, i'll just go with what is in there.

the 302 that's in the stang has a holley 750 and seems to be running pig rich. (i get about 80 miles on a tank)

Here are my questions :

can i use the EFI heads with the carb intake manifold ?
would a 550 or 525 cfm carb help me lean it out a bit ?

Thanks a lot

P.

Iownastang · September 9th, 2007, 07:31 PM

The 750 is too much carb and eveything else should just bolt right up.

sins23 · September 9th, 2007, 08:18 PM

that's what i figured, my 455 GSX had a 750 and it was just perfect for it.

So there shouldn't be any issues ports lining up ?

89LX347 · September 9th, 2007, 10:01 PM

just get a 600 cfm for it and it will be fine and yes you can use the same heads

ryans88gt · September 9th, 2007, 10:52 PM

A lower flowing main body has nothing to do with how rich or lean it is running. It could run just as rich with a 390 cfm carb as with a 1050 cfm dominator. Rich/lean is all in the jetting and air bleeds. With the same jetting a 750 will run much leaner than a 650.

The reason why you need a properly sized carb for the engine has to do with vacuum signal and the enrichment circuit working correctly. With too large of a carb the carb doesn't get enough signal and you get erratic power valve operation and crappy throttle response.

Your 750 is probably too large for a 302, but properly jetted and with the correct low vacuum power valves you should be able to get it to run pretty well.

sins23 · September 10th, 2007, 09:26 AM

WOW!,

the knowledge on this forum is great

don't go too far guys, i may and will have more questions soon

Thanks.

September 9th, 2007, 05:49 PM	#1
sins23 Newbie Join Date: Sep 2007 Posts: 3 iTrader: 0 reviews	Help carb'ed 302 /efi 302 So i bought a mustang .... 1995 Mustang (non/GT) the previous owner swapped in a carb'ed 302 out of a truck or something... Problem is the block is shot, oil and coolant shooting everywhere. I have an EFI 302 out of a lincoln Continental. My question is.... since i have 2 complete engines, what do i need to convert the EFI 5.0 into a carb'ed 5.0. reason is he cut the harness to shreds and rather than finding a new harness, i'll just go with what is in there. the 302 that's in the stang has a holley 750 and seems to be running pig rich. (i get about 80 miles on a tank) Here are my questions : can i use the EFI heads with the carb intake manifold ? would a 550 or 525 cfm carb help me lean it out a bit ? Thanks a lot P.

September 9th, 2007, 07:31 PM	#2
Iownastang I Post Entirely Way Too Much 1987 ford mustang gt well see when shes done Join Date: May 2007 Location: mascot, tn Posts: 5,020 iTrader: 0 reviews	The 750 is too much carb and eveything else should just bolt right up. __________________ 2004 tahoe z71 Daily 2004 BBM Gto ls1 6 speed 57,000 miles 1987 mustang hatch,347,world heads,systemax, kooks lts,nitrous, 6 point cage, team z front and rear suspension,8.8, 4.10s, 31 splines strange axles,wilwood brakes, tko600

September 9th, 2007, 10:01 PM	#4
89LX347 Hardcore Enthusiast Join Date: Apr 2007 Posts: 1,304 iTrader: 0 reviews	just get a 600 cfm for it and it will be fine and yes you can use the same heads __________________ I believe in art when it is not seen. I believe in music when it is not audible. I believe in God when He is silent.

September 9th, 2007, 08:18 PM	#3
sins23 Newbie Join Date: Sep 2007 Posts: 3 iTrader: 0 reviews	that's what i figured, my 455 GSX had a 750 and it was just perfect for it. So there shouldn't be any issues ports lining up ?

September 9th, 2007, 10:52 PM	#5
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	A lower flowing main body has nothing to do with how rich or lean it is running. It could run just as rich with a 390 cfm carb as with a 1050 cfm dominator. Rich/lean is all in the jetting and air bleeds. With the same jetting a 750 will run much leaner than a 650. The reason why you need a properly sized carb for the engine has to do with vacuum signal and the enrichment circuit working correctly. With too large of a carb the carb doesn't get enough signal and you get erratic power valve operation and crappy throttle response. Your 750 is probably too large for a 302, but properly jetted and with the correct low vacuum power valves you should be able to get it to run pretty well.

September 10th, 2007, 09:26 AM	#6
sins23 Newbie Join Date: Sep 2007 Posts: 3 iTrader: 0 reviews	WOW!, the knowledge on this forum is great don't go too far guys, i may and will have more questions soon Thanks.

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