LT1-LT4 Modifications 1993-97 Gen II Small Block V8

xfi 280 or 276 on 300cfm heads on 355

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Old 03-21-2008, 11:33 AM
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Default xfi 280 or 276 on 300cfm heads on 355

for a street car which cam would be better keep in mind i do not want to ruin my springs every 10,000 miles and want driveability/reliability i do however shift at 7k so if someone has any reccomendations or suggest another cam input is greatly appreciated
Old 03-21-2008, 01:35 PM
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I would use the XFI280 and something like the Manley beehive springs that are 150# on the seat. PAC also makes good springs. I don't think you will be able to spin that high with the 26918 valve springs. Keep the valve train weight down.
Old 03-21-2008, 01:44 PM
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The 280 is a good cam, but if you spent the money to rebuild your bottom end then spend the money on a custom camshaft. That way you will get the best power, driveability etc. Also at 7k are you still making power? Just because you can go that high doesn't mean you are still making power.
Old 03-21-2008, 02:12 PM
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Originally Posted by 1989GTA
I would use the XFI280 and something like the Manley beehive springs that are 150# on the seat. PAC also makes good springs. I don't think you will be able to spin that high with the 26918 valve springs. Keep the valve train weight down.


There are VERY few actual valvespring manufacturers, and when considering springs you have to consider what it may take to get them to fit and get installed height right.

My opinion of the XFI stuff is low.
Old 03-21-2008, 03:38 PM
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yeah if you want to shift at 7k I would go with a custom cam, I don't think the 280 would be a very good choice for that.
Old 03-21-2008, 10:25 PM
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thanks for the input only reason i asked about it is my friend was selling a 280 and i did not know much about it il just stick to the original plan of a custom BRE cam
Old 03-22-2008, 09:03 AM
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I thought you said you did not want to change springs every 10K???
Old 03-22-2008, 03:23 PM
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Originally Posted by 1sick-Z
thanks for the input only reason i asked about it is my friend was selling a 280 and i did not know much about it il just stick to the original plan of a custom BRE cam
BRE will be able to give you exactly what you want.
Old 03-25-2008, 10:58 AM
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Do you have the new Dart LT1 head, or is it a converted SBC head? your shifting the Hot Cam at 7k?????
Old 03-25-2008, 11:57 PM
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Nevermind, I saw your other thread.



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