Rhoads lifters are NOT required with the 60919 camshaft in a 455 with 10 to 1 or higher compression...IMHO. I ran that cam in my last 455 without them for quite a few years and it was fine. I installed them late in the life of the engine just to see what they would do.
I saw right at 2" more vacuum at idle speed, and smoother right off idle. The car ran exactly the same at the track, probably due to the 10" converter that flashes to about 3500rpm's.
That engine was 468cid, 10 to 1 compression, and it made about 10" vacuum at 750rpm's. With the Rhoads lifters right at 12", and noticeably smoother. The base timing was only set at 10 degrees BTDC.
We also built a 455 with unported 87cc Edelbrock round port heads, and the 60919 camshaft. It made 505hp on the dyno and put a 3900lb Firebird to 11.50's at 118mph in full street trim, driven to the track. I consider that pretty stout performance for unported heads and a pump gas street driven combo.......Cliff
__________________
If you can read this, thank a teacher. If you can read this in English, thank a Veteran!
https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
|