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525sc
Here’s what I got, a set of 525sc’s, one rebuilt 30 hours ago, other with a rebuilt blower. Stock heads were heavily ported. Want to kick them up, chillers abd pulleys for sure. I keep reading on converting to roller cams, what camis everyone putting in these? Thinking pull them apart, check out, add a little bit and then not worry about them (I guess that’s everyones goal haha!) |
I put the 731 in mine, haven't ran it in the boat but it ran like an ape on the dyno..... This was playing with different pullys
https://cimg4.ibsrv.net/gimg/www.off...bb749d6283.jpg |
Originally Posted by phragle
(Post 4679139)
I put the 731 in mine, haven't ran it in the boat but it ran like an ape on the dyno..... This was playing with different pullys
https://cimg4.ibsrv.net/gimg/www.off...bb749d6283.jpg |
no chiller but alum heads,,731, 6 psi boost, we spun it harder and made 640 on one pull. the black is 4 pounds,,,
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I also went with a Crane 731 when I did the top end on my old 525SC. I ran about 7.5# of boost with no chiller.
Finding smaller pulleys to fit the Merc 177 splined shafts is nearly impossible anymore. |
I got lucky, mine has been rebuilt with the keyed shaft
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There has been some smokin' deals on chillers for the 177 in the swap shop section. Right after I bought new ones
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Originally Posted by phragle
(Post 4679166)
I got lucky, mine has been rebuilt with the keyed shaft
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Originally Posted by tmmii
(Post 4679184)
does anyone have any more info on this? Where to get that shaft?
How much horsepower could you make out of the 525SC before changing to a bigger SC, could 700 hp be capable out of the 177 with the right heads, valvetrain, and pistons? I have also wondered if anyone has ever converted over to an EFI setup? Reason I ask is I have a pair of 525SC in my boat, I keep getting the bug to have a pair of 700-725 HP engines. I like the idea of keeping the 177 setup and improving it, but I also keep looking at switching to a Whipple EFI setup with good heads and a strong rotating assembly. |
2 Attachment(s)
I just did mine, 454 with roller cam, 177 blower and chiller, Sniper EFI
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What about just throwing 6-71's or 8-71's on? Probably best bang for the buck.
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Originally Posted by Jim Diesel
(Post 4679339)
Maybe check with The Blower Shop!
How much horsepower could you make out of the 525SC before changing to a bigger SC, could 700 hp be capable out of the 177 with the right heads, valvetrain, and pistons? I have also wondered if anyone has ever converted over to an EFI setup? Reason I ask is I have a pair of 525SC in my boat, I keep getting the bug to have a pair of 700-725 HP engines. I like the idea of keeping the 177 setup and improving it, but I also keep looking at switching to a Whipple EFI setup with good heads and a strong rotating assembly. |
Originally Posted by Griff
(Post 4679158)
I also went with a Crane 731 when I did the top end on my old 525SC. I ran about 7.5# of boost with no chiller.
Finding smaller pulleys to fit the Merc 177 splined shafts is nearly impossible anymore. |
Originally Posted by Precision
(Post 4679779)
I have a few. NIB.
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Originally Posted by Jim Diesel
(Post 4679339)
Maybe check with The Blower Shop!
How much horsepower could you make out of the 525SC before changing to a bigger SC, could 700 hp be capable out of the 177 with the right heads, valvetrain, and pistons? I have also wondered if anyone has ever converted over to an EFI setup? Reason I ask is I have a pair of 525SC in my boat, I keep getting the bug to have a pair of 700-725 HP engines. I like the idea of keeping the 177 setup and improving it, but I also keep looking at switching to a Whipple EFI setup with good heads and a strong rotating assembly. |
Have them do a steady state pull at 5400rpm. Im sure the power will fall off after a few seconds there.
I think 650hp is about where the 177 starts failing at power production. The blower only has so much capability to move more air than that. You need air to make power. They do make some great low end torque. Sort of like a 2.3L whipple, they make great low end, but they are somewhat limited to hp capability. Youre not gonna want a 2.3L for a 1000hp engine. Usually lower static compression, and more boost, will make more power than higher static compression, and low boost. Filling the cylinder with more air and fuel will be better than filling it with more metal and less air/fuel. |
Another vote for the 731 cam here. I have one in my 525SC and love it! |
Wow the new shaft kits are $280 per blower from tbs. really not a bad price with what all it came with and the pulley selection it opens up. |
Originally Posted by Griff
(Post 4679740)
A 177 will never make 700hp........
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