i just installed a summit 272 cam in my 355, will the stock springs handle .465 lift or do i have to change them? i want to have it running by tomorrow so i need to know asap!
thanks
later
Dan

you don't HAVE to change them, but you will probably start to experience valve float once you get past 4500rpm. do yourself a favor and get a set off .500 lift springs like gm's "z28" springs or comps "981's", or cranes "blazer" springs. pretty much everyone make a spring to meet your needs for cheap.

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black 76 camaro
vortec 406sbc
12.41@108.7MPH and dropping....

Please do yourself a favor and install a cheap, $25, (maybe $30 now), set of Z-28, -142 valve springs b/c the stock springs are only really made for the old -929 cam with a lift of .390"/.410", imho.

I'm not saying they won't work, but for how long??

You can get them from Competition Products, Powerhouse, Midwest Motorsports and others...

pdq67

Putting in a performance cam but using the stock springs is like leaving a good party at 11:00pm. You're missing half the fun.

Yes, stock springs will handle the lift. No, they won't be worth a damn over 4500-5000 RPMs.

Crane's recommended 99848 springs are a DROP-IN REPLACEMENT for stock springs. No machining required at all to put them in, so no excuses not to do it.