Anyone running the 276HR or 282 HR from Comp Cams??
I bought a High Energy™, 260H cam, lifter and timing chain kit but haven’t installed it yet.
On that note: I’m thinking I’ll have enough room to install the cam if I pull the radiator. Is that true?
I’ve got a Comp Cams retrofit hydraulic roller 276 in my 393W along with 1.7 roller rockers that take my lift to .545/.545 and then 276/280 duration. Love it!
When I switched from the Comp Cams X4262 hydraulic flat tappet cam to the XR-276RF-HR the engine picked up almost 100hp! Everything else stayed the same, so it had to be the cam! That translated to over a full second in the 1/4-mile! I won’t put another engine together without going roller cam!!!
Yeah Hydraulic Roller cams are great!! I have the 270HR in my 351w… I wanna get the 276HR and run Ford Racing 1.7 rockers as well! Do you have an automatic or stick? cause I dont want to do that cam and kill bottom end 
Well, first off, my 393 cubic inches need more cam than a 351 since it is 12% bigger, and the same cam will NOT act the same in a smaller motor ( just like your 270HR would be overkill in a 221/260/289/302). What is a mild cam for 400 inches would be a wild cam for 300 inches…
I am running an automatic - a wide-ratio AOD ( that’s a mechanically- controlled (no computer) AOD with the internal gearset from a 4R70W). That makes for a 2.84:1 First gear vs the ‘normal’ AOD’s 2.40:1 - an 18% difference! So that makes my 3.55 rear gears feel like 4.19s off the line in First, yet in Third both have a 1:1 (and converter lockup so no slippage). In OD, the 4R70W has a .70 overdrive ratio, whereas the AOD has a .67. Not enough difference to worry about… So anyway, the wide-ratio gearing helps a bunch with the bottom end, especially in my 4000-pound car!
Up until this year, I was running a 2400-2600 stall torque converter in my AOD. I was supposed to be installing a 3200rpm stall converter for this season, but my work schedule got in the way of my racing so there’s no hurry… I figure that would have picked me up another couple of tenths or so, yet still retain lockup for gas mileage… I’ll find out for sure next season when I’ll be retired and my job will not get in the way of having fun!
The 276 retrofit hydraulic roller and the standard hydraulic roller cams are not the same. The retrofit cam has a lift of .513/.513 with normal 1.6:1 rockers, and .545 lift with 1.7s. The regular 276HR has the .544 lift already. It all comes down to which hydraulic lifters you want to use. The retrofit uses stock 5.0 HO roller lifters (about $120/set) with the stock ‘dog-bones’ and lifter valley spider hold down, whereas the regular uses the more expensive shorter link-bar lifters. I opted for the cheap route.
Anyway, here’s the gratuitous pic of my car leaving the line a couple of years ago…
It hasn’t even moved out of the back yard this year since I have another dead car in the way – Yet another car I have to spend time on to fix. 
One of these days… …