Bowtie Overdrives? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Tom · 03-29-2005, 05:47 PM

LoL yes the ported vs manifold argument will go on forever, Im just giving the knowlage I've gotten first hand. My vortec 350 will surge at idle with ported vaccum, its rock steady with manifold [thats with 12-14* initial with no vaccum hooked up] Also when crusing high speeds [about 80mph and 2000rpm] if I let off the gas I would get a slight poping out the exhaust, with manifold vaccum theres no problems. I will admit though, when I go to emission I dial the initial back and change it to ported vaccum [works like a charm

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03-29-2005, 05:47 PM	#11
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,717	LoL yes the ported vs manifold argument will go on forever, Im just giving the knowlage I've gotten first hand. My vortec 350 will surge at idle with ported vaccum, its rock steady with manifold [thats with 12-14* initial with no vaccum hooked up] Also when crusing high speeds [about 80mph and 2000rpm] if I let off the gas I would get a slight poping out the exhaust, with manifold vaccum theres no problems. I will admit though, when I go to emission I dial the initial back and change it to ported vaccum [works like a charm ] __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.



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