521 SR71 spark plug recommendation
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521 SR71 spark plug recommendation
FastFlats November 13th 2021, 11:39 am
Hello all been a while since I’ve been on the site and had to create a new login. In the process of building a 521 with a set of SR71 heads and 13:1 compression for a drag boat and could use a spark plug recommendation. Thanks for your help.
FastFlats- Posts : 7
Join date : 2021-09-27
Dave De- Posts : 790
Join date : 2011-05-27
Location : Highland, MI
FastFlats likes this post
Re: 521 SR71 spark plug recommendation
wickettoby1 November 16th 2021, 5:16 pm
How do you sit down with balls that big? 
My neighbor has a jet boat that does 96mph in 660ft, every time he asks if I’d like a ride I tell him nope.....I’m good
My neighbor has a jet boat that does 96mph in 660ft, every time he asks if I’d like a ride I tell him nope.....I’m good
wickettoby1- Posts : 352
Join date : 2016-02-02
Location : SE Michigan
Mark Miller and FastFlats like this post
Re: 521 SR71 spark plug recommendation
FastFlats November 16th 2021, 8:17 pm
It’s a fun ride for sure, a whole different ball game than a car. We run 102-103mph in 800 ft and 105mph in 1000 ft.
FastFlats- Posts : 7
Join date : 2021-09-27
Mark Miller likes this post
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