still smoking

Does anybody know what jetting they had in the carb? I have read that they used a modified 850. I know the Merc's had dominators. I have a 950 that I can use. I am thinking about putting a 174 on my current setup. Also what timing, I am guessing no more than 30* with the steel heads and 91-93 octane.
I have what I think is pretty close to a copy of a HP450 454. It was built and installed in the boat when I bought it. I know it has a Crane 268761 cam which I think is like a 500EFI but with a firing order swap. I have CMI's. I believe the compression is 8.5-8.75 with the 088 heads.

Unlimited jd

iTrader: (5)

They are merc 420s with a 174 blower stock Holley 9022 800 cfm, 26* timing max according to the hawk marine power decal. I have 2 of them in my Excalibur

still smoking

The carb is just a stock 9022? I read that Hawk modified them to flow more, is that not the case?

mike tkach

iTrader: (3)

lil red,do you run them at 26 total timing?

Unlimited jd

iTrader: (5)

That's where there at for now, going to put v6 modules in and play with it a bit, mine have over 9:1 comp after they were rebuilt

mike tkach

iTrader: (3)

i know the merc 525sc had 7.5compression ratio,and a total of 35 deg timing.

Unlimited jd

iTrader: (5)

Yes that is correct, the mercs are also flywheel rated at 525 the hawks prop shaft rated at 525 about 570 flywheel

mike tkach

iTrader: (3)

with 9 to1 compression,and iorn heads,and no innercooler,detonation is lurking its ugly head,be careful buddy.

still smoking

Do you know what jetting and P/V you have in your carbs?

Unlimited jd

iTrader: (5)

I'll take one apart today and look for you, thanks mike i'llbe keeping a close eye on it an may go to a colder heat range plug. I've done a lot of tuning and minimal blowing up lol so we should be ok