Quote:
Originally Posted by rexs73gto
There is another thing you forgot to mention that the RAII only used the 1:55 rockers & the RAIV used the 1:65 rockers. The overall lift of the cams in both were different to. The RAIV total lift was .520 & if I'm correct the total lift for the RAII was in the .480 realm. The RAIV was a better version of the RAII heads. Each step was just a bit better. Although there were some back in the day that didn't like the RAIV cam but loved the RAIII cam. I like the RAIV cam & have used the Crane blue print version in the last 5 $%% & $)) builds. I love the way they work for me. & I use the 1:65 rockers on all of them to.
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Correct. I didn't mention the 1.50 vs 1.65 rockers since I assumed that was common knowledge but it's good that you mention it in case others stumble across this thread later one.
To clarify for those that might be new to the hobby.....the RAII and RAIV camshaft are identical. On the RAIV, the overall lift at the valve is greater due to the 1.65 rocker arm ratio.
No doubt the RAIV intake ports flow much better than the stock RAII and other hi po D ports of the same era. I am curious as to why the Pontiac engineers felt they needed that much more flow without also addressing the exhaust port at the same time? Maybe they realized the development of the exhaust port has reached it's zenith and that led them down the patch of developing the RAV? It sorta looks like those exhaust ports should flow quite well...