2112

Intake at .300 244.7 cfm
Exhaust @ .300 202.3 cfm

Primary tubes are 2.25 ID

Carb 1250 dominators Max rpm 6250

Swept down headers to exit under the swim platform on a 32 Fountain.

Wette Vette, Yes I am seeing the pulsing you are dscribing but the boat sits very very low in the water. Although the pipes do not go under water, The swim platform is literally sitting on the water creating a pocket of air underneath. If a wave comes up while idling, the motors will suck up water like vacuum poluting the oil.

Seems when fountain removed the bottom material to create the step, it allows the boat to sit 4 inches lower in the water than a non-step 32, The same amount of the step height.

JCPERF

Spread the lobes to 112.Less overlap,reversion, and idle quality will improve.

WETTE VETTE

You need to install flappers if your pipes are that low. That applies even with stock power. I ran a 276/284 dur @ .050" solid roller cam in my Baja. The headers had the water injected about 6" from the end of the tailpipe and the tailpipe came through the hull about 4" below the water. Never had an ounce of reversion. If you aren't seeing water residue on your plugs or milky oil after running your motor you aren't getting reversion. Get some flappers!!

Craig

JimV

iTrader: (1)

If you remember seventh grade biology, cranium is skull or head. Richard or dick........Lighten up

MESABALANCING

Can I ask a question not about lobe sep angle on this post what is the operating temp of the engine with this problem ? I just had a problem with a customers engine and found something I had never seen before and might be able to help find the solution. Feel free to give me a call and I might be able to help Sincerely Laz Mesa

cooltoys61

Most would understand the even if it's not there. You are a newbie as well,,lighten up, it was obviously chosen as a funny name,right?

RichardCranium572

2112, I'm glad to see your heads flow good numbers at .300" lift, alot of head porters get the high lift numbers and don't get the lower lift. Always keep in mind the valve is at .300" twice

As for cam specs for the RPM band you are using, because the exhaust ports are so good, I don't think you need the extra exhaust duration. I would do a single pattern camshaft at ~.750" gross lift and 268 @.050" on a 114 LC. I would also use the 18726543 firing order for better idle quality too. This combination will help reduce pumping losses in your engine. Another plus is you will probably pick up horsepower as well