[77 TRASHCAN]

I remember Jim Hand saying he had his V-Max's set at essentially "zero" lash.

When you do this, does it have any effect on the rocker arm geometry???
Do you have to plan ahead to zero lash the V-Max lifters w/ appropriate push rod length, because of doing so?

[THEGTOCHISM]

I ordered in the crower springs and ss valves for the 6x4 heads. Then I ordered in a set of 85cc d port kRE heads also . Now since these aluminum heads have 85cc's, is this going to cause a problem with the comp 274H cam? I know that cam caused cylinder pressure to build early. I wish I could afford the "old Faithful Roller cam' but right now this comp will have to do . Any other cam recommendations on a cam with the kre heads?

[THEGTOCHISM]

Anyone tried the 274H comp cam and Rhoads lifters? Opinions on that, and which one the v max or original?

[Cliff R]

Very bad idea. Those cams have super-fast seating velocity and adding Rhoad's lifters to them could end up with a pretty noisy valve train.

We built and dyno'd the first 455 with the KRE aluminum "D" ports, it made 502hp/567tq with the Crower 60919 cam and high ratio rockers on it. The heads were stock 85cc, no porting anyplace, not even a port match......Cliff

[THEGTOCHISM]

thanks Cliff The only reason I asked was because I thought with the kre 85cc heads and that cam the compression may be to hi for pump 82 oct.

[THEGTOCHISM]

i meant to say 92-93 octane

[Cliff R]

Once again the XE274 becomes a poor choice for the engine combination. Those cams are short seat timing, and tight LSA, so it will pull power DOWN in the rpm range, and narrow up the power. This RAISES dynamic compression, and peak torque occurs earlier, so octane requirements will be increased.

I had a customer try to duplicate my old engine combo when I used unported 85cc KRE's on my last 455, he used the XE274 camshaft instead. He had the same basic car that I do, but it was 200 lbs lighter, with more gear and more converter. It never did bust into the 11's no matter what he did. His best ever runs were 12.0's at 112mph.

My car 200 lbs heavier with the 60919 cam/high ratio rockers/Rhoad's lifters instead of the XE274 went 11.70's over 116MPH.

So the other guy installs a "shelf" Comp XE 236/242/110 HR cam and he gets his car to 11.70's at 115-116mph with no other changes.

I went to a smaller HR cam on a wider LSA, 230/242/112 and went 11.50's at 118mph. So in both examples the cam on the wider LSA ran quicker at the track in ET and in all scenarios more MPH.......just saying......Cliff

[gtofreek]

Originally Posted by Cliff R

Those heads do not need hardened seats installed, the factory induction hardened all of the heads after 1972. I've opened quite a few sets up for the larger 1.77 valves and never had any seat recession, so the factory process goes pretty deep.

I like the V-Max, as they are designed to be "adjustable" for bleed off rate, and you can run them very close to zero lash.

The standard ones are fine for what you are doing, ran them in my last 455 for many years with zero issues anyplace. They got a little loud when the oil got really thin, but not noticed unless you had the hood up for some reason and engine was idling......Cliff

They are actually hardened about .100"-.150" deep, and outwards to about 1.75" diameter or so. But in opening up to 1.77" you almost cut through it, so it's very little after that point.

[rtanner]

first imo, ditch the 274, listen to cliff, he has seen this movie play prob more than anybody, now i have alot of expeirence w rhoads lifters been using them ever since the first magazine article about em in car craft, DO NOT use rhoades lifters w a high energy,or xtreme energy cam, the loab profile of those cams makes the valve train noisy by nature, and rhoades are noisy when hot, your motor will sound like its coming apart and you will hate it!!!!

[THEGTOCHISM]

OK 60919 cam is ordered . I just have to the the lifters now. thanks everyone