intake manifolds

Tarr said

I have been told they are as good as the LD340. Any comments?

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Those intakes are pretty good from the factory. It's just that they are made out of Iron instead of Aluminum.
68-70 are squarebore (i think)
71 and up are spreadbore for the Thermoquad carbs.

A stock 340/360 intake is probably better then the Performer bacause they have larger ports. The Performer intake I think has the small 318 port size like the LB4B has

On another note, These were rencently on E-bay...
# 290125373484
Just sold for $130= shipping. Looked pretty good, but painted. You can find them off and on for a little more usually.

This one was $165 = shipping #180123917859
Almost looked like new except front water pump bypass fitting.

If I had the LD340, I wouldn't worry about buying another intake like the "air gap", especially for a street engine. Like was stated earlier, put a 1" spacer in it and fine tune it for your application.

Now if I had to buy another one I'd look for a air gap or LD340, which ever is cheaper at the time.