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Originally Posted by 87CigCafe
(Post 4920358)
I had great results with my 317’s built to marine specs!
https://cimg2.ibsrv.net/gimg/www.off...b908fd357.jpeg |
https://cimg3.ibsrv.net/gimg/www.off...9c1be98d1.jpeg
317’s made great NA power. 750 + on my 565’s. 87 on gps in a straight bottom 12 m ftn edit: BTW - That was Tks to Valako. His name should be on the valve covers! |
Originally Posted by getrdunn
(Post 4921156)
https://cimg3.ibsrv.net/gimg/www.off...9c1be98d1.jpeg
317’s made great NA power. 750 + on my 565’s. 87 on gps in a straight bottom 12 m ftn edit: BTW - That was Tks to Valako. His name should be on the valve covers! 317s really perform. The Weingartner test of 290vs317 head to head wss very revealing. They both shared higher HP as the rpm curve went up. He even dropped milled down the 317s to the 290 chamber size to make it an even test. Part throttle cruise with vacuum and less flow...will likely favor the 290s, certainly in smaller (454) BBC displacements. |
Originally Posted by Tartilla
(Post 4921162)
What are you running for a cam?
317s really perform. The Weingartner test of 290vs317 head to head wss very revealing. They both shared higher HP as the rpm curve went up. He even dropped milled down the 317s to the 290 chamber size to make it an even test. Part throttle cruise with vacuum and less flow...will likely favor the 290s, certainly in smaller (454) BBC displacements. Valako wedged my intake ports and opened up some crucial areas. I think mine wound up close to 350 cc but they outflow the 340 cnc by a substantial amount. You’d think they’d be lazy even on 565’s but definitely not. Peak hp @ 6k. Amazing how much torque and throttle response in my heavy boat but has a slippery bottom to help. the oval port 290’s be my pick up to 502 ci depending on application. Light boat vs heavy boat - hull design etc etc. My old 454 builds on roids had the dart oval ports and worked awesome. |
https://cimg3.ibsrv.net/gimg/www.off...96b727dbe.jpeg
https://cimg5.ibsrv.net/gimg/www.off...fe5852690.jpeg https://cimg8.ibsrv.net/gimg/www.off...02136adb9.jpeg https://cimg9.ibsrv.net/gimg/www.off...27156becd.jpeg https://cimg0.ibsrv.net/gimg/www.off...3402999e0.jpeg Got back from machine shop and got short block done, installed cam tonight. See shot of card. |
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Need help picking head gaskets. The block was decked and I did not have the machinist do a smooth finish. As a matter of fact it seems rough. The heads are very smooth. I purchased some cometic mls .040 gasket and now realize that a rough surface is problematic with a MLS style gasket. The short block is assembled and I don't want to go back. From the research that I have done it seems like a copper gasket with the seals seems like the best selection for the situation, a rough surface deck and very smooth head?
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I always use Fel-Pro 17042. I have been using a light film Permatex 80697 copper spray with great results.
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Thanks how do you apply it? Do you tape off cylinders? Thanks
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Originally Posted by SkiDoc
(Post 4921944)
Thanks how do you apply it? Do you tape off cylinders? Thanks
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