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-   Do It Yourself, Boating on a Budget (https://www.offshoreonly.com/forums/do-yourself-boating-budget-249/)
-   -   350 meg not performing up to par ? (https://www.offshoreonly.com/forums/do-yourself-boating-budget/353666-350-meg-not-performing-up-par.html)

hotshot537 04-29-2018 11:19 PM
350 meg not performing up to par ?
 
I have a 21 foot advantage 21 SRBR Just read did the top end on my small block 355 https://cimg8.ibsrv.net/gimg/www.off...a9e3c4303.jpeghttps://cimg7.ibsrv.net/gimg/www.off...76d8e7ffb.jpeg
AFR heads 180cc
edelbrock rpm air gap
scorpion roller rockers 1.5
x4270hr cam
brand new Edelbrock 1409 600 CFM carburetor
msd ready to run distributor Mechanical Advance set to 32°
bravo one drive
Bravo one prop 22p

Max out at 53mph @ 4300rpm will not go higher than 4300rpm
it just doesn’t seem right and I can’t figure out what’s wrong runs perfect
any suggestions on what I could be

Bondo 04-30-2018 05:13 AM
Ayuh,.... Ya need a smaller pitch prop to get the rpms up,....

30ftpanther 04-30-2018 10:12 AM
What was speed and rpm before?

hotshot537 04-30-2018 11:05 AM
Originally Posted by 30ftpanther (Post 4624073)
What was speed and rpm before?
stock 350 with blown head gasket 14 x19p four blade offshore prop 50mph @ 5000rpm

BUP 04-30-2018 11:19 AM
battery switch mounted to floor - I would move that to help keep exposed terminals from forming corrosion. And if its mounted on top of carpet - carpet stays wet plus dry carpet - a fire hazard waiting to happen. Just wanted to let you know. Not picking on you but safety is important as well.

hotshot537 04-30-2018 11:47 AM
Originally Posted by BUP (Post 4624087)
battery switch mounted to floor - I would move that to help keep exposed terminals from forming corrosion. And if its mounted on top of carpet - carpet stays wet plus dry carpet - a fire hazard waiting to happen. Just wanted to let you know. Not picking on you but safety is important as well.
It’s not mounted at all It screwsto the side of the engine cover when the engine covers installed and is approximately about 1 foot above the floor

30ftpanther 04-30-2018 05:16 PM
Have you tried the 14x19p prop AFTER the top end work?

underpsi68 04-30-2018 06:39 PM
You added a blade and went up about 2.5 in the pitch. You need to try a smaller prop.

94sylvan 04-30-2018 06:57 PM
Try a 21p Mirage Plus prop. with that setup.

Ryan00TJ 04-30-2018 07:45 PM
Originally Posted by 30ftpanther (Post 4624157)
Have you tried the 14x19p prop AFTER the top end work?
yep, this will give you an idea of how much power you have gained. With that setup you want to spin at minimum 5000 rpms.


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