Dart pro 1 215 with SBC

[Yves]

I have 2 rather urgent questions regarding the use of Dart pro 1 215's on a SBC.

I noticed that my pushrods run angled towards the roller rockers and that the roller rockers themselves are angled toward the valve (mainly the intake). I guess that the valves are offset/spaced. Will this be a problem and should I go with shaft rockers and thus the $$$$ route ? BTW what is the offset on these heads ?

Secondly, because of my roller cam, i always use a revkit. The aluminium bar seems to be able to bend in, right in the middel because of lack of support. Can this be tackled somehow.

Thanks for any input.

[BIG CHIEF]

Hello,

In some cases we have seen some pushrod interference when using stock GM blocks. It becomes a problem when our machining and GM's machining stack up on the high side of the machining tolerance. Their are two ways to correct this problem. 1.) Would be to purchase a set of Isky adjustable guide plates, measure the port wall thickness and clearance a small amount of material where the pushrod hits the head. Then adjust the guide plate to correctly align the rocker tip center to the valve. 2.) The simpler of the 2 is to run a small offset rocker probably close to .150 offset to produce the clearance needed.

As for the Rev kit mounting you will need to fabricate a flat mounting area to the bottom of the head if needed to support the center area that we leave open.

Thanks,

~M

[Awesome Bill]

Rev kits were used 20 years ago and do very little if anything. Todays springs are much better than yesterdays. You can clearance the head a little before final assembly, My route is T&D or Jesel, roller rockers are terrible and don't use them if I don't have to. They are pricey.

[Yves]

Well, i think the offset between the pushrod and the valve is caused by the valve spacing being wider on the heads than normal. It looks as if i just won't get there by using adjustable guidplates alone.

The reason why i didn't go with shafts before is because of cost. Seems now that i could have used the money better on the shaft setup instead. I think that offsetting is better done with shaft rockers.

As for the revkit. I drilled through the aluminum bar and put in a bolt that supports the bar in the middel against the head. I just hope that the bolt won't bite in the head because of the vibration.
I would like to continue running the revkit. The reason is that i run my engine in high rpm, but would absolutly want to avoid valve float. For roller followers this proves to be lethal...The revkit prevents the followers from leaving the cam in any condition.