Pretty sure I am going to buy a set of shaftmounts.

From this...
http://www.tdmach.com/pn-05900.shtml

My cam is .64X intake, and .67X exhaust. How would I go about setting the shaft height since the lifts are different? Or do I need to get weird rocker ratios to even out the lift?

 

Figure out the total intended valve lift - what ratio that cam was made for. Figure out the lobe lift. Order the ratio that gives you the total valve lift that cam was supposed to create.

My question: Is there a preference between creating more lift with the cam or going with a taller ratio rocker. For example, let's use .600 total valve lift. If starting from scratch...

1.65 rocker arm with .363x" lobe lift?

or

1.5 rocker arm with .400" lobe lift?


The LS1 uses more rocker @ 1.7:1 stock, right?

Ryan

 

i had the same question as you ryan. i think someone answered it a while back. i dont remeber the answer though

brook

 

if your site is up to date i think you need injectors also

 

My website hasnt been updated in forever, lol. Ive got plenty of injector.

I really didnt follow the intended lift thing? The lifts I quoted were with 1.6 rockers on both sides.

My question was for setting up the shaft heights of the shaft mounts. It says for lifts over .650 lower the shaft height by 1/2 the distance in lift difference (so lower .010 on exhaust for me). For Lower than .650, go the other way. (that would be plus .005). I dont see you being able to move the shaft in opposite directions...
so......

 

Jared: I was referring to arm ratio. You have that figured out. My mistake. I understand what you are asking now .

Ryan

 

I think I'd split the difference if it were me, but at -0.0025, it really isn't going to make a ****. Surely you aren't the only one in the world with shaft rockers and different intake versus exhaust lift.

Even still, in the range you're in, most people run more intake lift than exhaust. It takes better advantage of the high lift flow of the head on the intake side, whereas too much lift on the exhaust can hurt the scavenging effect. I'd shoot for .660" intake at least.

Mike

 

The set comes with shims to go under the rocker mounting bar. The bar is a few thousands under what your min lift will be for the set up. Ya check the geometry and shim accordingly,or do like I did with DRE,I sent them a head and had them make the stand and offset as needed. No extra charge and a guaranteed fit.
If ya need a set of these PM me and I will give ya the details.

 

Mike-
Getting in over my head that in depth into cam design. BES locally specced the cam for my buddies 396 AFR LT4 with similar flow numbers to mine and ran really well (487rwhp/131.x traps). I figured in my 383 it would be a little more peaky a few hundred more RPM up.

Larry-
Thanks again for the info here and in PMs!