440 intakes late 60's vs mid 70's vintage

[Sixt8Chrgr]

Is there any performance difference between a stock 68,69 cast iron OEM 440 intake and a early to mid 70's smog OEM 440 cast iron intake?

Thanks,

[Challenger340]

Yep !
the later spread bore mid 70's intakes make MORE power, I think more to do with the larger cfm Carbs that are able to be applied ?

We did try an adaptor plate back in the day, to mate the 850 Thermo to the earlier Intake ?
We gained 60ft, but still lost E.T. & mph at the Track.

Just using the Later Intake & Bog Carb was still faster, even than a 850 Holley mated to the early Intake W/adaptor.

The Later Intakes are a Nice upgrade on the Earlier Engines.

IMO
Bob.

[Cooter]

Is there any performance difference between a stock 68,69 cast iron OEM 440 intake and a early to mid 70's smog OEM 440 cast iron intake?

Thanks,

How many you want? I got about 5 laying around..Cut you a deal on these boat anchors...

[FLG]

71 intakes are known to be one of the best flowing 

[Sixt8Chrgr]

How about a 75 intake? Do they flow good?

Thanks

[firefighter3931]

71 intakes are known to be one of the best flowing 

The 70-71 4bbl manifold is the best factory piece ever made. The Dyno don't lie 



Ron

[flyinlow]

Yep !
the later spread bore mid 70's intakes make MORE power, I think more to do with the larger cfm Carbs that are able to be applied ?

We did try an adaptor plate back in the day, to mate the 850 Thermo to the earlier Intake ?
We gained 60ft, but still lost E.T. & mph at the Track.

Just using the Later Intake & Bog Carb was still faster, even than a 850 Holley mated to the early Intake W/adaptor.

The Later Intakes are a Nice upgrade on the Earlier Engines.

IMO
Bob.

So my 76 Thermoquad intake and my 72 cop car intake are  high performance intakes if I block the EGR valve?  Never would of thought that.  I was just keeping them to store carbs on.