Porting small block 915 j-heads

Hi guys and Gals,

Short Side Radius, what's the LOWDOWN on 'how far to go'?

Anyone got some flow bench info as I don't want to wreck a good set of J's by 'going to hard' at IT!

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As you can see the floor is limited by the waterway, but how far should you 'pull the seat' BACK???
You don't really... you do like the cutaway.