? about rocker arm side play

[daves 72 dart]

how muck side to side play should there be in my rockers?

 

[340sFastback]

What kind of rockers, stock, steel roller, aluminum?

 

[Guitar Jones]

Man I love these questions with no information.

I have a noise in my car while driving, what is it?

 

[C130 Chief]

Some, but not too much.

 

[daves 72 dart]

here is ny build 340? block
Work done: O-ringed, tubed for roller cam, oil gallies enlarged, bored to 4.07(.030 over) and honed with deck plates by Herb McCandless.

340 steel crank
Prepared by Lunati, stroked .110 to 3.42 stroke and balanced to 8000 rpms

340 steel rods
Prepped by Lunati. Hand picked set. All are within .001 of each other in length. Bronze bushed, balanced and lightened.and shot peened.

Heads
340 X heads with 2.02 intake valves and 1.60 exhausts. Double springs for .700 lift cam, Maximum porting on intake and exhaust ports.Ports are 63cc combustion chambers. they flow 260 cfm

Pistons
Venolia lightweight forged pistons. Uses dykes top ring, 1/16 2nd ring and standard tension oil rings. Weight is 510 grams.11.3 comp

Intake
Holley Strip Dominator ported to match heads.the carb is a bigs 950 stage 5

Camshaft
Cam Motion roller 269 275 @ .050 and .631 lift with 1.5 rocker Valves set on .024 .028
RPM range 4500-7500. Cam is degreed in at 104 deg centerline.

Other Parts
High volume Melling oil pump, Comp Cams roller lifters, Crane 1.5 roller rockers(gold), Fluid Balancer, windage tray, Cloyes double roller timing set. SCE copper head gaskets(.060). Tall valve covers for use with roller rockers. Moroso 8 qt deep sump oil pan. Bronze cam gear for use with roller cams.

 

[340sFastback]

I am runniung around .020" side to side clearance per pair of rockers arms on mine. But I run the Comp Cams Pro Magnum steel rockers which will have a different expansion rate compared to aluminum. I believe Comp calls for a minimum of .030" side to side clearance which I thought was excessive so I ask some pro engine builders who told me the slightly tighter clearance would be fine. So far so good.

What does the instruction sheet that comes with the rockers say to run?

 

[340sFastback]

And do not over tighten the rocker shaft hold downs. Around 18 foot / pounds is all that is needed. Otherwise you will crush the shafts and/or snap the bolts and create problems.

 

[crackedback]

I have a noise in my car while driving, what is it?

Loose nut behind wheel! :-D

Tough to answer without more info.

 

[Guitar Jones]

I run the Crane rockers and I have mine at around .060. between two rockers. I don't think it's real important as long as the roller tip keeps full contact on the valve stem. I did have to shave the sides and use shims to get them aligned with the valve tip.

 

[340sFastback]

If the clearance is too tight they will bind when the engine gets hot and that will cause some big problems.

 

[daves 72 dart]

thanks guys