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Old 11-07-2010, 08:15 PM
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Isn't the stock compression 9.4:1 on the vortec engine? What dish would you recommend to get it back to the stock ratio? I am looking to do a similar build and would like to keep to close to stock as far as the compression goes.

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Old 11-08-2010, 07:31 AM
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Quote:
Originally Posted by chucksrt
Isn't the stock compression 9.4:1 on the vortec engine? What dish would you recommend to get it back to the stock ratio? I am looking to do a similar build and would like to keep to close to stock as far as the compression goes.
I'm not sure what the stock compression is, but if you're running a carb, 8.5:1 would be closer to stock for carb applications.
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Old 11-08-2010, 07:45 AM
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If the stock pistons are not too worn they will work very well for this application, near ideal for the application actually. If you want to bump the compression ratio up slightly you can have the block zero decked or mill the heads a little. There really is no reason to not reuse the stock pistons- as long as they are not too badly worn. Get a good hone job and a good rering kit and you should be on your way.
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Old 11-08-2010, 09:52 AM
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If you are going for new slugs then what has been mentioned would be a good choice, D dish hyper KB's, tried to do a DCR/SCR calc but,,,

Quote:
96 roller block- zero decked
062 Vortec heads-stock springs and valves-64cc
comp cam-xe250h valve lift .432/.444, duration@.050-206/212
You have a roller block, what is the grind # of this cam? from what I gather there is no roller XE250H cam???? maybe this one:

http://www.compcams.com/Company/CC/c...?csid=184&sb=2

if that is the case then your back to the drawing board cause your heads need to be modified etc etc and you are on the harry edge of lift at .444 with stock vortecs anyhow, I would say whoa right there

Another thing,,, good idea to measure the actual cc of the heads cause some 062's are 67 cc they are cast GM but not true L31.
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