My friends getting a 92 5.0 LX and currently it has a CHP 347 with forged pistons, I-beam rods, and a cast crank, and no main support. It has Edelbrock RPM heads and intake. I dont know what cam, exhaust, valve size, injectors, or throttle body. He wants to put a supercharger on it and I suggested 6-8 lbs because its safe and because the engine doesnt have a main support or forged crank. I also suggested Highport heads because I dont think the RPM intake is designed for strokers, let alone a blown stroker. The highports have larger chambers to get the comp down since I'm sure this engine is like 10to1 since its an N/A setup from CHP. Also the highports have larger intake and exhaust ports more suited for racing a 347. I'm not sure what his budget is and I know either combo will make great power with a supercharger. Should he just leave the engine alone and run the blower or should he go with different heads more suited for larger engines. Remember the comp is probably high. Also, what kind of power could he expect with a 6-8 lb supercharger on an RPM or highport headed chp 347. I want this combination to be reasonable since its a stock block so nothing over 550 at the flywheel. Thanks again
What combo should my friend use and power output?
- Thread starter SmockDoiley
- Start date
powershift351
New Member
I would leave that engine alone, 347 is a pretty wild stroker, not sure you want to run much boost through that setup due to the compression. I am betting it has closer to 11:1 compression. Maybe 6psi won't hurt, but not sure how much cylinder wall you have left. I would go N/A all the way, and port the **** out of some heads, run a serious cam, 92 octane
Well I called CHP and they said if its got standard pistons then its probably 10.5 to 1 with 60 cc heads. I've noticed that the Vic heads can be had in 70cc which should take the comp down to about 9.5to1 which is safe with 6-8 lbs of boost. And the heads are great for a stroker since the runners are so large. How much power are we looking at if we use a vic intake, vic heads, 347 stroker and 6-8 lbs of boost. I guessing around 550.
powershift351
New Member
a grip of power, 9.5:1 would be much better. Domed pistons would definitely do the trick. I bet closer to 600 with 8psi of boost.
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