Guest Posted January 6, 2002 Share Posted January 6, 2002 I purchased a 68 Skylark convertible that was converted to a GS 455. Not sure exactly what is on the engine now but, when I bought it I got a spare block, timming cover,crank and heads. I want to build a Stage 1 or 2 and not sure where to start. I started checking part numbers on the heads to see what the were and if they are even usable. Here is what I have so far.<BR>Part #: 1231786 (checks as a Stage one head)<BR>Part #: 1240149 have no Idea<BR>How do I know which one is left and right?<BR>Why do I ahve two different part #s?<BR>How do I know what type of block I have?<P>thanks...Sunny<P>null Link to comment Share on other sites More sharing options...
The Old Guy Posted January 6, 2002 Share Posted January 6, 2002 The stage one heads were the same number as the standard head. They just installed larger vales by machining the heads differently. If there is more than a thumbnails thickness between the valve ,you have standard heads.The heads are interchangable and will fit either side . I have no info on the numbers ,but if the heads have a long thin slot for the manifold heat they are 70 or earlier. If they have a rectengular hole ,they are 71 up .If the block has two elongated holes and two bumps on the top of the head surface it is a 71 up block Link to comment Share on other sites More sharing options...
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