Recommended Holley Carbs for Blue Thunder MR 8V Intake

[Wahoo65]

Is anyone running the Blue Thunder MR 8V Intake? If so, what carbs are you running? Are the mechanical or vacuum? Are you running a std trans or auto?

Thanks,

[427 S/O]

For now, I run two 450 mechanical secondaries, and stright linkage for kick a$$ acceleration. Power valves and jets will need adjusted for your engines profile.

[427 S/O]

Pardon me, I don't have the BT intake but, It doesn't make a large difference. 2x4's are 2x4's.........

[KobraKarl]

Wahoo,

The Blue Thunder intake is almost an exact copy of the original Fomoco midriser, if you want mechanical secondaries use the 450's like Perry, If you want to run 590's , 600's, or 650's I would run vacuum secondaries, with a mild progressive linkage.(a more user freindly setup)

KK

[johnd9]

Everyone

I am considering making some changes on the 428 in my car - more aggressive cam and a different intake set up. A local guy here in New Mexico suggests I do the dual quad set up with a BT manifold and two 550 cfm carbs. For ultimate performance I am sure he is right. But what really is the difference between how the car will run/perform with a great intake/cam/heads and a single four barrel 750 cfm and the dual quad, BT manifold and two 550 CFM four barrels? Are the dual quads difficult to keep in tune/maintain running well?

Thanks

John

[KobraKarl]

John,

I cant really speak for the differences between single and double , but the 2x4 set up i run is very stable . Once your cam is run in, tune your idle jets for max vaccuum , and size your power valves accordingly. it will run like a "raped ape"

KK