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There's noticeable power to be had going -1 with a 2.25 valve and if you upgraded the rocker gear to a paired rocker system you could put a big cam in it which would be worth more. Then again how well sorted is the parts combo you currently have?
Ross pistons for a 572" (4.505borex4.5stroke with a 7.1rod) but can be used for a 540" (4.250strokex6.535rod) They are flat top with a nice valve relief for a typical .800" lift cam and 2.25" intake. They are NEW. For standard type "440-1 heads". Build sheet with pics $600.
That's a nice looking car! 680 is a big number for those parts but, it probably has enough power to do what you want. Like has been mentioned it'll have to have some suspension changes. GOOD rear shocks, tires and likely more gear. Free-up any bind in the front suspension too. How good is the...
I can do some 'packaging' with these parts and other unlisted associated parts not listed depending on your needs. I'm about 25miles North of Detroit, Michigan 48316.
1)Roller cam LSM 4/7 swap NEW 278/290 @ 050 .490/.480 lobe 112 lsa (.730"ish lift with 1.5 rocker)$450
2)Roller cam Lunati NEW...
Not exactly sure the protocols of this site being it's fbbONLY but, the engine and build tech is the same to share. Some day I'll have a NSS car? I do enjoy that class and the '62-65 cars especially. Doug has been very helpful on my build and I too am lucky to have that resource. I vicariously...
Thanks guys. The new motor LOOKS pretty similar but it's a KB alloy block with 'lowly' 440-1 heads. I took off the intake, carbs, jesel belt, and DS oiling system. New one has about .840" net lift and am hoping for over 900HP. I do have some 572-13 heads I might try OR I also have some Predators...