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Discussion Starter · #1 ·
First I need to know how much lift can the factory shaft rockers handle? I am building a motor for my 70 F100 and it will be a .030 390 w/ a hyd cam, thinking of 224/230 @ .050 .519/.530 Lift. I haven't decided on the lobe sep, either 110 or 112, any input would help there, I have a set of C4AE heads I am porting and will probably run a Perform RPM intake w/ a 750 carb. Any input would greatly be appreciated.
 

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Discussion Starter · #4 ·
Stock pieces. Is there anyone who makes a affordable adj. set? I just can't go the $600 adj. rollers right now. I will be going up to 5500 at the most, I just want reliability.

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87 Mustang GT 5spd 2.73 daily driver
70 Torino GT 429 C6 3.89
70 F100 360 C6 3.25L (in lots of pieces)

<font size=-1>[ This Message was edited by: MGT351 on 5/20/02 11:49am ]</font>
 

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Note that the Isky's have a separate piece in the end sitting on the valve. That is a hardening rubbing block and the Isky's seem to last longer than the rest and there is a very slight performance advantage.
 

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Discussion Starter · #6 ·
Does the ISKY rockers come with the shafts also? pushrods will be no problem, and the cam is 224/230 @ .050 and .519/.530 lift on 112 lobe seperation. I am having the stock cam reground to these specs.
 

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I've been reading up on the 390...I just acquired one in a '61 Tbird...Looks like oil delivery in the 390 is a weak spot according to Pat Ganahl in "Ford Performance". He outlines a series of mods to improve. If you've got the engine still out, something to consider if you're gonna be spinning it harder.

2c
 

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24 years ago, I built a 66 Fairlane GTA 390. Cam was a sig erson with 292 duration and .575 lift. Rockers were stock with the adjustment nut. Had zero problems with the stock rocker setup up to 6500 rpm with this cam. What you really need to be sensitive to is how much lift before the valve springs stack up.
 
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