351w and roller rockers

RFMustangGT

Member

Apr 4, 2005

294

0

16

Knoxville,TN

Aug 18, 2005

#1

• Aug 18, 2005

• #1

I'm trying to set the gap between the roller tip and the spring and I was wondering what should the gap be? I'm using hydo lifters. I know that you set the piston at top dead center and then tighten the nut all I need to know is what should the gap be set at. I've heard everything from .030 to 3/8 of an inch. please help! thanks ahead of time.

 

3

351carlo

New Member

Mar 9, 2004

267

0

0

Philadelphia

Aug 19, 2005

#2

• Aug 19, 2005

• #2

Hydraulic lifters are set with a preload, not a gap. You should check your cam booklet for instructions. You basically tighten them to zero lash, and then put another 1/4-1/2 turn on them to set the preload.

 

1

1969mach1351

Member

Apr 18, 2003

285

0

16

Sacramento, CA

Aug 19, 2005

#3

• Aug 19, 2005

• #3

351carlo has it right. To get zero lash kinda spin the pushrod with your fingers and you'll feel when its snug. I use 1/4 turn after that.

 

rbohm

Founding Member

Apr 12, 2002

6,698

550

204

tucson,az

Aug 19, 2005

#4

• Aug 19, 2005

• #4

yep zero lash then 1/4 turn more. as far as getting zero lash, i like to check the vertical play of the pushrod rather than the spin as it is more accurate.

 

ddonaca351

Active Member

Dec 1, 2002

2,055

1

48

Camas Washington

Aug 19, 2005

#5

• Aug 19, 2005

• #5

Different cam and lifter manufacturers like different amounts of preload (NO GAP ON HYD LIFTERS) check with your cam or lifter manufacturers tech department for their reccomendation.
General rule of thumb is 1/4-1/2 turn.

DD

 

RFMustangGT

Member

Apr 4, 2005

294

0

16

Knoxville,TN

Aug 19, 2005

#6

• Aug 19, 2005

• #6

thanks guys. this has really helped me out.

 

1

10secgoal

Active Member

Dec 1, 2003

2,801

3

49

San Diego

Aug 19, 2005

#7

• Aug 19, 2005

• #7

You can't have the piston at top dead center, unless you are positive it's on the compression stroke. It doesn't matter how far you turn the nut. All you have to do is get the clip in the lifter .010 of the seat. the amount you actually turn to do that is dependant on the thread pitch. Just watch it, it only has to move a little.