Advantages/Disadvatages od using a Spreadbore carb on a Squarebore Intake
02-13-2010, 10:50 PM
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Car: 1988 Trans Am, 2005 Sierra 2500
Engine: Vortec 357
Transmission: Built TH700R4 with 26-2800 Stall
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Advantages/Disadvatages od using a Spreadbore carb on a Squarebore Intake
As the title states I just bought a Holley 650 Spread bore carb with electric choke and vaccum secondaries. I didnt realize it was a spread bore until I got it home. I luckly had an adapter laying around and bolted it right up and had her fired up in about 30 minutes. But I wanted to know with the carb sitting 2" higher now, what are the dis-avantages/advantages of using it on a squarebore intake?? I hear I will gain better low end but loose top end? Let me know thanks!!!
02-14-2010, 02:01 AM
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Car: 1984 Z28 Hardtop
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Re: Advantages/Disadvatages od using a Spreadbore carb on a Squarebore Intake
Spread-to-square adapters usually have flow issues with those huge secondary valves being shrouded. Holley's spread-bore carbs are anything but performance-oriented as well.
02-14-2010, 08:46 AM
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Car: 1988 Trans Am, 2005 Sierra 2500
Engine: Vortec 357
Transmission: Built TH700R4 with 26-2800 Stall
Axle/Gears: GM 10 bolt 3.73 Posi
Re: Advantages/Disadvatages od using a Spreadbore carb on a Squarebore Intake
I have heard they do have flow problems, but the car is mostly a street car and will only hit the track maybe 5 times a year. I had a 600 edelbrock before this and that carb was junk through and through. I still have some tuning to do because it backfired a few times. Just trying to get the adapter and carb to bolt together and down to the intake was a PITA.
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