LS1 springs

[AaronGTR]

6"-6.125" is 1/8 inch, not 1/16th.

Sorry, forgot my math. They were .0625" longer overall, or 1/16". According to the explanation on comp cams page (thanks Brad ) the numbers in the service manual were probably gauge measurements and not overall measurements. The guy I talked to at Smith Brothers probably new this and said he would go by the numbers in the manual. I have a set of pushrods on the way, 6.0" for exhaust and 5.68" for intake. Hopefully they will be right, and if they're a little off, I might be alright since the roller rockers are adjustable (as long as the roller tip stays in the right area on the valve stem).

[v6h.o.]

6"-6.125" is 1/8 inch, not 1/16th.

Sorry, forgot my math. They were .0625" longer overall, or 1/16". According to the explanation on comp cams page (thanks Brad ) the numbers in the service manual were probably gauge measurements and not overall measurements. The guy I talked to at Smith Brothers probably new this and said he would go by the numbers in the manual. I have a set of pushrods on the way, 6.0" for exhaust and 5.68" for intake. Hopefully they will be right, and if they're a little off, I might be alright since the roller rockers are adjustable (as long as the roller tip stays in the right area on the valve stem).

hopefully your stock lenths put the rocker tip in the right place on the valve. a better way to have done this to make sure for the correct lenths would have been to use an Adjustable Pushrod tool from Crower or Comp cams. this way you could have setup the rockers. ensured the tip was in the correct location and measured the pushrod tool for the exact proper lenth.

i dont think betterthanyou and Lloyd had any issues with pushrod geometery on the 3400 they put those rockers on. but hopefully they're right.

[bszopi]

Crower is the only place you can get a checking pushrod from. All the other cam companies that I looked at (Comp, Crane, etc..) startr their checking pushrods at either 5.75" or 6.00". Crower was the only one that had one that was from 5.50"-6.50". I have it. Of course, I have yet to use it. One of these days....

[AaronGTR]

Got the pushrods in yesterday. They actually made them 1/16" shorter than the stock ones. I gave the guy both measurements and they still screwed them up. Oh well, luckily they seem to be working ok and the roller tip of the rocker stays in the safe zone on the valve stem. Dumb luck. They're very nice though. Heat treated 4130 chromoly, .089" wall thickness, black nitride coated, and good for over 400lbs spring pressure. They should handle anything I ever do with my engine. Exhaust are 6.0" one pieceand intake are 5.68" with a ball fitting on one end. I'm clearancing the lower intake manifold for the rockers right now and then I can finish putting everything together. Did my exhaust yesterday too. Welding's fun.

Oh yeah, no problems with the pushrod/guideplate clearance. Maybe since my heads and the engine the guide plates came from originally had 1.6/1 rockers there wasn't a problem.