International47
Newbie
I'm rebuilding a roller block 350, its been bored .030 over.
I currently have the roller cam and all its supporting assembly from a low mileage vortec.
Plan is to mildly port and polish the heads and put either the stock vortec cam or a mild roller cam into it (Rock Auto has the 93-95 LT1 cam for $360 shipped).
This is not a fancy build, just low revving, reliable, tbi torque.
The TBI heads are the heavy duty, oddball 810's,
they have rotators and oil shields on both valves, the exhaust valve stem is a 3/8 thick stem- and sodium filled. spring seats are both cut deeper in the heads.
The question is about the valve springs.
The stock 810 valve springs are the same duel springs in the 193 heads, just set lower into the head to make up for the height of the shield and rotator.
I'm looking for ideas or opinions on valve springs for the roller cam.
Would the common Z28 springs be suitable?
I'm not sure about removing the shields and rotators, I don't think shimming the spring that high is a good idea.
Is using the "z28 springs" with the shields and rotators a problem (added valvetrain weight/ possible extra things to break)?
I have the stock Vortec springs, i know the spring rates are claimed to be the same as the 810/193's but vortecs are a single spring. the vortec and stock 810 spring both have the same free height measurement.
Any input would be helpful..... I could also just pick up a set normal 193 heads instead and not deal with the duel rotators and deeper seats?
Thanks
I currently have the roller cam and all its supporting assembly from a low mileage vortec.
Plan is to mildly port and polish the heads and put either the stock vortec cam or a mild roller cam into it (Rock Auto has the 93-95 LT1 cam for $360 shipped).
This is not a fancy build, just low revving, reliable, tbi torque.
The TBI heads are the heavy duty, oddball 810's,
they have rotators and oil shields on both valves, the exhaust valve stem is a 3/8 thick stem- and sodium filled. spring seats are both cut deeper in the heads.
The question is about the valve springs.
The stock 810 valve springs are the same duel springs in the 193 heads, just set lower into the head to make up for the height of the shield and rotator.
I'm looking for ideas or opinions on valve springs for the roller cam.
Would the common Z28 springs be suitable?
I'm not sure about removing the shields and rotators, I don't think shimming the spring that high is a good idea.
Is using the "z28 springs" with the shields and rotators a problem (added valvetrain weight/ possible extra things to break)?
I have the stock Vortec springs, i know the spring rates are claimed to be the same as the 810/193's but vortecs are a single spring. the vortec and stock 810 spring both have the same free height measurement.
Any input would be helpful..... I could also just pick up a set normal 193 heads instead and not deal with the duel rotators and deeper seats?
Thanks