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Topics - 427Fastback

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31
FE Technical Forum / Rocker arm to shaft clearance spec ???
« on: June 23, 2013, 09:56:42 PM »
I have to hone out my Dove/Comp rocker arms for clearance.Most of them are tight at .0005 to .001 clearance.I am fitting them to a nice set of H/S heavy duty shafts.They measure identical to each other....I would imagine the rockers will expand some what on the thick shafts....

I was thinking around .002 clearance but am interested in thoughts and opinions..
Engine is solid lifter 270S and no crazy valve spring pressures..

They will be honed on a machine for trueness and I have a ($$$$)Bower 3 finger measureing device that will read to 5 decimal points...

Cory

32
FE Technical Forum / valve sizes..
« on: October 23, 2012, 12:14:53 AM »
Hey guys...I bought a set of the edelbrock 427 Heads for the 427 in the Mustang with the plans of putting the stock size 427 MR valves in it..I have converted them to the 16 bolt exhaust flanges and done some port and bowl work..(clean up).Recent reading is making me think I dont need valves that big and it may actually hurt me.

Engine is a 9.8 to one 4.25 bore 427.Comp 270S cam.I have roller rockers,headers etc etc.Intake will hopefully be one of Jays 2pc ones otherwise it will be a Perf rpm...

Car will be around 3000lbs and 100% street driven.It would easily pull 6400rpm with the CJ valves in C8-H heads and CJ manifolds..

Looking for opinions on valve sizes...The cam is staying in..I dont want solid rollers on the street and Hyd is not a option.(C5AE C/O block)

Share your opinions please on the valve sizes..

Cory

33
FE Technical Forum / milling edelbrock heads
« on: July 03, 2012, 10:50:42 PM »
Does anybody have any numbers on chamber volume change when milling..eg..for every .010 cut how many cc's does it change...(or points of CR)
I have the 76 cc 427 edelbrock heads...I am in need of more squeeze..

Thanks
Cory

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