Offshoreonly.com - Bulletproof BBC Combo....SC or NA.....

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Im building a 502 simular to your combo.How much mph did you gain from last engine.What was in your boat before?Did you run Powervavles in the secondarys?
Dave

What type of exhaust systems are you using on the combos above?

Thanks
Torbjorn

Just my .02

It really depends on the load you are trying to push. I know of a pair of 1000 Blower motors going on 325 hours and only has had the lash set every spring.

It also depends on how you drive them. If you get in the boat and push the sticks to the wood and leave them there, stay away from the blowers, if you are looking for the power to have a quick blast when needed, they cannot be beat.

I cruise mine around 3500 and make the blast when desired. They will last like that.

If you want any details PM me and I can give you some details, I have been both routes, of course now we went a little overboard on the new ones :rolleyes:

Again my .02

I agree with the PV's

Quote:

Originally posted by Turbojack
mike-I do not know the answer from the person you are looking from but I have used power valves on every project I have done. Carb jetting is a compromes from off idle to wide open. Power valves just help you get close to the right Air/fuel ratio right on at all throttle settings. This goes for blower or NA. If you only go from idle to full like in a drag boat or car then power valves get in way.

Just curious if he was using PV's front and or back with that jet s
set up

Allan
Kaama pretty much sumed it up
622 lbs tq@3400, 529lbs @ 5600
563 hp @ 5600
The only thing different in my combo is the Crane 741 cam, (straight up) merlin 310 VR heads that Valako cleaned up (cc chambers, 3 angle valve job) Crane rockers, 950cfm Holley HP4150 w/82 jets front and rear, 1" carb spacer, K&N 7" tall filter
One other thing was I had the block squared and decked about 10thou (I think) to increase quench. Run a .038 head gasket.
JE 9.8-1 Pistons W/C&A rings. 34* timing all in @3400rpm
Our #'s are pretty close, so I dont think your far off, might just be the cam