Going freshen up 420's
#1
Going freshen up 420's
I'm thinking about pulling the motors this winter, hour meter is a 800. They are 420hp 454's, other than dropping on a set of blowers what is the best way to increase power but keep reliable? I'm not opposed to blowers but it might be overkill for what I'm looking for. Formula 311 with TRS drives. I know it's a very vague question, I have built many SBC and a hand full of LS gen 3 motors but not much with BBC especially marine. I gave up the race car for boating, not to save money just something different. Lol
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Convert to roller motor and call bob madera for custom cams and set-up. When I re-built my gen V 502, bob was the best phone call I made. If you don't make that call, you'll regret it.
http://www.marinekineticsonline.com/
http://www.marinekineticsonline.com/
#8
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I was going to have my heads redone and use them with my roller cam upgrade on my 420's. Every one was cracked between the seats. I ended up buying new in aluminum for what it would have cost to fix those old ones. Since I was on a budget I used the World Merlin III's with the raised exhaust port. There are a lot of good heads out there. Good luck
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Convert to roller motor and call bob madera for custom cams and set-up. When I re-built my gen V 502, bob was the best phone call I made. If you don't make that call, you'll regret it.
http://www.marinekineticsonline.com/
http://www.marinekineticsonline.com/
Also agreed on heads. The last set of rectangle port heads I had done cost so much to make them compatible with what I was doing, I could have bought brand new AFR heads.. (had @ $2500 into two pairs>>>)
If you're not opposed to blowers, the 420' really come alive with flat top pistons and 671's. Good roller cams (from Bob) let 'em spin to 5800, 7 lbs boost and they'll run all day! -I'd stay away from the little 177's, just a heat pump...
Last edited by Biggus; 08-12-2015 at 10:30 AM.