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**Wrenchbender Ret** · 02-09-2021, 04:27 PM

I'm thinking you have too much back pressure in the exhaust system. 292 engines have a very restrictive exhaust system. That "quiet" muffler is causing a lot of back pressure. Have them build a system with 2 1/4 or 2 1/2 pipes & a free flow muffler.
4:11 gears are as high as thy come for that rear end. A 5 speed with o-drive would be the way to go.
George

02-09-2021, 04:27 PM	#20
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,190	Re: Loud air sucking noise on acceleration I'm thinking you have too much back pressure in the exhaust system. 292 engines have a very restrictive exhaust system. That "quiet" muffler is causing a lot of back pressure. Have them build a system with 2 1/4 or 2 1/2 pipes & a free flow muffler. 4:11 gears are as high as thy come for that rear end. A 5 speed with o-drive would be the way to go. George