Help picking out a cam...
10-09-2016 | 10:13 AM
#11
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From: Fort Worth, TX
As you know, we have the same combo to the carb aside from cams. Mine has a Isky cam with 525 EFI specs. Based on how the boat runs, I'd say it's in the 530HP range.
Last edited by TxHawk; 10-09-2016 at 10:17 AM.
10-09-2016 | 10:13 AM
#12
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From: Toledo Oh
10-09-2016 | 10:54 AM
#13
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From: SF Bay Area
You shouldn't have any issues with idle quality and the current cam you have. The 525 efi cam would work really well with that setup and it responds very well to boost. 236/244 @.050 114 lsa. I have one coming out of a motor in the next week. Johnson lifters as well. Cam does have a flat nose for mark iv block...
The charger has been sitting on it unused all season for the sake of the stock drive, and that's also why I want the option to not run it. I do plan on upgrading the drive to at least a 1x and keeping it easy on the sticks.
10-09-2016 | 11:12 AM
#15
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From: SF Bay Area
You shouldn't have any issues with idle quality and the current cam you have. The 525 efi cam would work really well with that setup and it responds very well to boost. 236/244 @.050 114 lsa. I have one coming out of a motor in the next week. Johnson lifters as well. Cam does have a flat nose for mark iv block...
can't help much on cam, but I ran a HP500 with a procharger for years, several carbs and EFI, last setup had to go down to a 750 from a 850 to keep from leaning out at WOT, thanks god for widebands. the air was being blown thru so quickly that would not pull fuel, the 750 worked perfectly
10-09-2016 | 12:52 PM
#16
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From: frankenmuth michigan
Originally Posted by MILD THUNDER;44898hy42
I like the 525 EFI cam or similar
I towed wake boarders and kids on tubes behind my 1000 hp procharged efi 272 all the time, if i was going to have a full tank of gas and 7 people in boat AND tow i would throw a 28 pitch on, i also had 24"long trim tabs but had no problem popping up on plane and staying planed out at 20 something mph around 2800 rpms with a cam that was 245/255 then a cam that was 252/259. It was a 540 but still wasnt difficult whatsoever, fwiw, smitty
Since you tow tubers and wake boarders, I'd look into selling the centrifugal, and picking up a 250 blower. Couple that to those oval ports , should make more than enough low end, and good top end as well. Throttle actuation and response down low with a roots is very good.
I towed wake boarders and kids on tubes behind my 1000 hp procharged efi 272 all the time, if i was going to have a full tank of gas and 7 people in boat AND tow i would throw a 28 pitch on, i also had 24"long trim tabs but had no problem popping up on plane and staying planed out at 20 something mph around 2800 rpms with a cam that was 245/255 then a cam that was 252/259. It was a 540 but still wasnt difficult whatsoever, fwiw, smitty
Since you tow tubers and wake boarders, I'd look into selling the centrifugal, and picking up a 250 blower. Couple that to those oval ports , should make more than enough low end, and good top end as well. Throttle actuation and response down low with a roots is very good.
10-10-2016 | 01:40 AM
#18
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From: SF Bay Area
Double skis??? I didn't even know that those still existed!!! 
It looks like the 525 EFI cam is the hot ticket here. Thanks for the input!
I'm actually thinking of chucking the super charger idea altogether. It's an open bow and once your above 50mph chit goes flying everywhere, the women start screaming, and I either run out of lake or the open waters are too rough to open her up. I just think it's the wrong boat to do it with considering the drive upgrades involved etc. I can get 63 out of her now, and a new cam plus some other tweaks oughta get me in the upper 60s which I think is the limit for this boat without reinventing it.
It looks like the 525 EFI cam is the hot ticket here. Thanks for the input!
I'm actually thinking of chucking the super charger idea altogether. It's an open bow and once your above 50mph chit goes flying everywhere, the women start screaming, and I either run out of lake or the open waters are too rough to open her up. I just think it's the wrong boat to do it with considering the drive upgrades involved etc. I can get 63 out of her now, and a new cam plus some other tweaks oughta get me in the upper 60s which I think is the limit for this boat without reinventing it.
