I'm finally finishing up my engine swap, 258 to 360, and am looking for some help on exhaust. My engine has been rebuilt and has the following:
Roller Rockers Harland Sharp CSP-S4004
Camshaft Comp Cams K10-202-4 268/268 Lift .456/.456
Exhaust Valves Manley 11859-8 Race Series Stainless Steel
Intake Valves Manley 11892-8 Race Series Stainless Steel
Pushrods Comp Cams 7694-16 Magnum Pushrods
Intake Edelbrock Performer 2131 no egr
Pistons Keith Black Silv-o-lite 40 over
Water Pump Flowkooler High Volume
Thermostat Mr. Gasket High Volume
Headers Edelbrock Shorty Ceramic
Carb Holley Truck Avenger 670cfm
Ignition MSD Ignition Box, Upgrade wires, cap, rotor, plugs
I want to run dual exhaust (Thrush two chamber welded) mufflers and an H-Pipe with turndowns right before the rear axle. This is how my 258 was setup, but my dual outlet header went two into one with a single turndown right before the rear axle. It seemed to have a lot of power with only an intake, carb, header, and ignition (no internal work)... until it died... RIP. I've read that sometimes a Y-pipe with a single muffler running out the rear adds some torque to the 360. I have a one inch body lift for a little extra clearance. No emissions here so I don't need cats. Will the setup I want hurt me on performance with my engine specs? Any way to tell? Will I have enough backpressure with this setup? Thanks!
Oh, and here's a pick of the Jeep. Still need to buy the carb.. and a radiator.. and a few other things.