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Old 05-16-2011, 10:43 PM
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i found a holley 650dp vacuum secondary, origional 340 4 bbl intake casting number 2531915, 270h cam kit, full length headers and a summit exhaust system. was curious if i just purchased a frankencombo.
the cam was recomended by a local cam shop and i really don't know much about the manifold.

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Old 05-17-2011, 10:45 AM
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Originally Posted by badknuckles
i found a holley 650dp vacuum secondary.
That is!
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Old 05-17-2011, 11:02 AM
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Maybe a dual feed, not DP, common mistake. I suppose the parts aren't a total mismatch but this depends a lot on what it was being used on. The cam might not be the hot ticket for a 273 w/high gears and a stock TC, for example.

The intake isn't a large port, would have been used on a '68 or '69 340, I believe. Heavy but usable. Not the best choice for the cam (something like a high rise dual plane- think RPM), but like I said, usable.

LT headers will always be a safe bet, but they may or may not fit whatever vehicle they're used with. The exhaust system will likely be adaptable to a variety of vehicles.
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Old 05-17-2011, 02:49 PM
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If that is the 270 magnum cam it needs packaging. That is for a 400hp build. RPM intake and 4.10 gears a good idea.

The original 340 4bbl hp with a factory purple shaft 2783 cam .429/.444 lift is a charmer. My mopar street rebuilds are based of this cam. Low 8.5 compression, a 600 holley , headers, and a 3.23 gear with 26 " tire. Gives a great cruiser with a heavy hammer. Mopar R n D got it right the first time.

The Edelbrock performer cam in a 305-350 GM with intake ,and Q jet a close second.
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