180shabah
Rear Admiral
- Joined
- Mar 26, 2005
- Messages
- 4,995
Somebody asked a question today and I couldn't give a definate answer, so I will turn to the guru's here.
Is there any reason not to use 1.6 instead of the 1.5 ratio rocker arm on a marine 350 ('87-'95 vintage)?
He is using the stock Merc cam(lobe lift is at or slightly below .300. I think). His thoughts are it will provide extra lift(this is a given) for a little more power. I would agree, although I doubt it would be a huge power gain. Also, since timing, duration, LSA, etc would not change there should be no additional risk of water injestion, right? What about increased fatiguing of the valve springs, or as long as they are not fully compressed will they be fine?
The conversation just went in circles, good, bad, good.....
So now I defer to you guys who have modified more engines than I have owned; What are the pluses and minuses of a swap from 1.5's to 1.6's?
Is there any reason not to use 1.6 instead of the 1.5 ratio rocker arm on a marine 350 ('87-'95 vintage)?
He is using the stock Merc cam(lobe lift is at or slightly below .300. I think). His thoughts are it will provide extra lift(this is a given) for a little more power. I would agree, although I doubt it would be a huge power gain. Also, since timing, duration, LSA, etc would not change there should be no additional risk of water injestion, right? What about increased fatiguing of the valve springs, or as long as they are not fully compressed will they be fine?
The conversation just went in circles, good, bad, good.....
So now I defer to you guys who have modified more engines than I have owned; What are the pluses and minuses of a swap from 1.5's to 1.6's?