FR500 High-Lift Camshaft Kit

FR500 High-Lift Camshaft Kit

Thumbs up to FRPP for putting together a very respectable camshaft kit. New cams, valves, springs, followers and valve stem seals for $1350...now if they would just drop the prices of 4.6L aluminum blocks back to $400 :-)

The FRPP cam specs are quite respectable as well. Probably not as agressive as some other aftermarket cams, but far more agressive than stock.

FR500 cam specs
Intake: 258 deg. @ .003 w/ .472 lift
Exhaust: 254 deg. @ .003 w/ .472 lift
Centerline: 109 (intake and exhaust)
* duration at .050" not available from FRPP

'96-'98 stock cam specs (according to Crane) Intake:
Primary - 196 deg. @.050 w/ .397" lift
Secondary - 206 deg. @.050 w/ .397" lift
(perhaps, the difference in primary and secondary duration is to enhance swirl through staged opening of the intake valves)
Exhaust:
Primary & Secondary - 196 deg. @ .050 w/ .397" lift
*stock centerline spec not known

One of the biggest surprises in the kit is the quality of the valves. The valves are every bit as well made as the set of ModMax Ferrea valves I was going to use. The intake valve has a dual angle cut (i.e. seat plus entry angle) to enhance flow. As the FR500 valves and Modmax Ferrea valves both come in bags printed "Made In Argentina", it's a good bet that the FR500 valves are made for Ford by Ferrea.

Intake Valves

Exhaust Valves

To accommodate the higher lift, the FR500 valve springs are longer than the stock valve springs. The FR500 springs also use a slightly smaller cross-section spring wire. The keeper grooves in the FR500 valves are moved closer to the stem tip to accommodate the longer springs. As for the FR500 followers, the valve end profile is changed slightly to provide required clearance for the spring retainers due to them being closer to the tip of the valve stems.

Back

Copyright 1999-2003 David O. Simmons
All rights reserved for contents of this website
Unauthorized use of the contents of this website is prohibited