If money wasnt a concern Aluminum all around .
There isnt a problem with shifting like in the 70's when they first came out (Vega with teflon sleaves).Which worked when you put iron sleeves in.
The cobra block is Aluminum isnt it ?
The R-Block I've seen not just heard peoples problems with them also , I wish Dart made a Aluminum block. The A-4 was to good so they stopped making it.
Last time I looked into it the Aluminum block i wished for was like $5000.00 all finished and could be bored and strocked to (454) and set up for yates heads. good yates heads are pricey also.
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89 with 331 t3'/t4 hybrids. upr Suspention worked out finnaly . 9.89 144 mph .
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