4.8 carb tuning help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68Stepbed · 07-18-2017, 09:02 AM

Sweetc10, did you get this sorted out?

Sweetc10 · 07-30-2017, 06:28 PM

Quote:

Originally Posted by 68Stepbed

Sweetc10, did you get this sorted out?

Sorry for the late response. I have been in class for work last couple weeks haven't had time to mess with it. I did raise the timing and it runs better but still at wot it's a sluggish and goes fat. I will try the soring and see what happens

hotrod 80 · 08-23-2017, 10:35 PM

Just to put things in prespective . My 750 on 388 ci sbc is 13 at idle and all in at 33 at 2600 . It is jetted 69Front 69 rear no power valve. The 4.8 is like 284ci I always aim for 12.5 to 12.8 WOT.

Sweetc10 · 08-31-2017, 05:31 PM

The afr gauge shows rich but plugs are white

07-18-2017, 09:02 AM	#1
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Re: 4.8 carb tuning help Sweetc10, did you get this sorted out? __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system

08-23-2017, 10:35 PM	#3
hotrod 80 mini truck racer Join Date: Aug 2006 Location: Baytown , texas Posts: 3,010	Re: 4.8 carb tuning help Just to put things in prespective . My 750 on 388 ci sbc is 13 at idle and all in at 33 at 2600 . It is jetted 69Front 69 rear no power valve. The 4.8 is like 284ci I always aim for 12.5 to 12.8 WOT. __________________ 1949 5-window 1969 Camaro 1976 Chevy Luv yellow 1978 Chevy Luv Blue 1976 Chevy Luv Black 1979 Firebird Flooded in Harvey 1999 F350 Dually 2005 GMC Sierra 4.8 RCSB 2014 Explorer (wifes) My build :http://67-72chevytrucks.com/vboard/s...d.php?t=399148 Build #2: http://67-72chevytrucks.com/vboard/s...d.php?t=653583

08-31-2017, 05:31 PM	#4
Sweetc10 Registered User Join Date: May 2016 Location: Houston texas Posts: 51	Re: 4.8 carb tuning help The afr gauge shows rich but plugs are white



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