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Old 05-20-2010, 08:46 PM
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max valve lift on factory sbf heads

just wanted to know how much lift can you put in factory sbf head. what im looking for out of the cam is sound more than performance. its my dads car and he really likes a good sounding motor.

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Old 05-21-2010, 03:47 PM
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It all depends on what year engine the heads are off of. Are they pre 80s or like off the mustang roller engines? Need more info to really help you out. You can run into some serious problems playing around with cams exspecaly with stock parts don't ask me how i know. So has anything been done at all to these heads even freshened up? If this engine is bone stock i would be very careful which cam i choose. nothing over a 480 lift but someone else may be able to explain it better then i can ( the actual specs) you will need to do this.JMO

Cole

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Old 05-22-2010, 03:51 AM
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"Factory SBF head" covers a lot of ground, but if you are talking about the 221-302 motor, bolt in a hydraulic flat tappet CompCams Thumpr. You said you were not particularly interested in performance, but sound. The Thumpr will do just that.
HYDRAULIC − Thumpr™ − High performance
street, stock converter ok, best with 2000+
converter and gears. Choppy/thumping idle.
Hyd. range of operation 2000 to 5800
part no. 31-601-5
grind no. 279TH7
advertised duration 279 296
0.050" tappet lift duration 227 241
Lift at the valve .491 .476
lobe separation angle 107°
Here's the cam card, shows the springs to use....
http://www.compcams.com/Cam_Specs/Ca...csid=1472&sb=0
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Old 05-23-2010, 11:11 AM
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thanks for the info. the heads are not roller and they are the adjust hydr. set up. factory springs and factory rockers. dont know what year the heads were made in, but the motor came out of a 64 fairlane. but im pretty sure the heads are newer than that. and agin thanks for the infor. almost forgot the mortor is a 289 ci.

Last edited by #!new; 05-23-2010 at 11:13 AM. Reason: for got to list motor size
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Old 05-24-2010, 07:09 AM
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I'm not certain about the Thumper series but most moderate lift cams require non-stock springs. And as I discovered in this thread spring height can become a challenging issue on some Ford heads, particularly if you want to use your stock valves as I did.
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Old 05-24-2010, 07:37 AM
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Something to add to what cboy said, Something i have learned is when you go to a higher lift cam as said you really should change the springs, and also when you change the springs you should go to screw in studs with a set of guide plates also .JMO. After doing all these changes you just changed the geometry. Myself i feel when you go to a bigger lift cam all these changes need to be made to work together( PROPERLY). JMO


Cole
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Old 05-24-2010, 12:00 PM
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thank for all the info. not a ford guy so all the help is needed. like i siad it is my fathers car and i told him i would try and help him. maybe i can talk him in to buying a chevy
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