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RV4 cowl on Smith

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I know some of you guys have owned or built RV's, I'd like to get some help with dimensions to see if an RV4 cowl will adapt fairly easily to the Smith. I'm changing to a 2.5" prop spacer and rebuilding the existing cowl is really not an option. It's had so many band aids, I really would be cutting it up for a pattern and I may still keep it for racing with the 6" extension, even though it weighs a ton.
Questions are:
width of cowl @ firewall
height of cowl from centerline of spinner
Thinking of using the James aircraft holycowl, anyone with experience with them, give me some input.
Thanks in advance,
Mark
 

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