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deez nuts
Two Feathers

74 Posts

Posted - 08 Dec 2016 :  9:32:40 PM  Show Profile  Reply with Quote
Building a 461 stroker. Ported stock heads aluminum intake HFT cam 228/235 @ .050. lift is somewhere near 480/490 (can't remember exact lift). Engine is going in a 77 T/A with a Borg Warner 4spd and 308 rear. Mostly a street car but might see some track time. Goal is to be 400+up at the crank.

Which of these 2 carburetors is the better choice for my 461? Running pump gas and street manners are probably more important. Still want it to rip though.

750cfm vac sec manual choke 3310 series


770 vac sec manual choke street avenger series

*Price difference between the two isn't enough to concern me...

Thanks for the help!

The Great White Buffalo

7284 Posts

Posted - 09 Dec 2016 :  10:01:06 AM  Show Profile  Reply with Quote
I'm not a fan of Holley Vac Sec carbs, especially on manual trans cars. Mild automatic cars with tall gears, they are ok.

Bowties are for Pee-wee Herman. LS swaps in Pontiacs should only apply to Fieros.
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Crazy Horse

527 Posts

Posted - 09 Dec 2016 :  10:44:25 AM  Show Profile  Reply with Quote
I think that engineers do things for a reason.Virtually all factory high performance engines came with vac sec carbs.I drive a stick shift RA V tunnel port engine on the street with the factory Holley vac sec carb.For a race most or only engine I would do the double pumper.Tom
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