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Old February 3rd, 2012, 11:48 AM   #1
hoyt5885
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vortec head question

i am in the process of building a 350 it is boored 40 over and is a 85 block i want to put vortec heads on it but beleive the heads only allow up to a 470 lift cam and i have a 488 lift cam in it and was wondering what needs to be done to the heads
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Old February 3rd, 2012, 11:51 AM   #2
jbsjunk
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The valve seal area needs to be machined down so the spring retainer won't hit.
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Old February 3rd, 2012, 11:57 AM   #3
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an awesome set up for good torque/hp, have a set for sale if u don't already have some
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Old February 3rd, 2012, 08:47 PM   #4
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Quote:
Originally Posted by hoyt5885 View Post
i am in the process of building a 350 it is boored 40 over and is a 85 block i want to put vortec heads on it but beleive the heads only allow up to a 470 lift cam and i have a 488 lift cam in it and was wondering what needs to be done to the heads
Have the valve guide shortened and machined to accept standard valve seals (0.520 I believe). I recommend screw in studs and pushrod guides also.
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Old February 3rd, 2012, 09:07 PM   #5
sbcrichie
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usually if you get aftermarket spring retainers they are clearanced for bigger lift cams. I am running well over .500" lift with no valve stem clearancing on the heads, i have crower spring retainers and they clear the seal no problem at full lift.
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