Hey guys,
I'm looking for some advice on re-building Dads 340ci 4bbl engine in his 1973 'Cuda. It's a good engine as is and was fine when pulled from the bay but I'd like it to be more streetable rpm wise and perhaps pushing the 400hp mark. Dad doesn't want anything too wild, just a nice cruiser with power there when needed. I purchased some NOS truck 3.08 heads a year or so back and would like to use these. It currently has W2 heads with some custom porting.
I would like to put the 3.08 heads on, a new manifold and a lower rpm street cam. The manifold we buy HAS to to accept a 340 4bbl Shaker set up. It has a hi-rise on now but we don't mind losing a little hp and high end rpm to fit the Shaker. All items will be installed professional but I'd like the manifold to be a direct bolt on and matched as possible to the 3.08 heads. Any input is appreciated.
Thanks,
Carl
Current Cylinder heads: Factory W2 oval port intakes, D Port exhausts extensive port, bowl and combustion chamber modifications, hardened exhaust valve seat inserts, Ferrea 2.02 intakes, 1.6 exhausts. Comp-Cams 995-16 valve springs 1.70” installed height, 130lbs at the seat. Comp-Cams 740-16 10 degree retainers and 10 degree valve locks. Crane roller rockers 1.5 ratio. Offset intake rockers, straight exhaust rockers.
Current Camshaft: Comp-Cams 20-224-4 extreme energy, 110 degree lobe centers, .488” intake valve lift, .491” exhaust valve lift, 230 degree duration @ .50” intake, 236 degree duration @ .50” exhaust. RPM operating range 1800rpm-6000rpm. Comp-Cams custom length pushrods, Comp-Cams hydraulic lifters, JR double row steel timing gear set.
Current Other: A 450hp Rated 340 Steel crank, Hi volume sump and oil pump, intake and heads all port matched, HEI MSD 650cfm Mighty Demon (mechanical secondary’s). Forged pistons and penned rods. Engine was balanced by a company called: “Unbalanced Bob”. Carter 120gph competition fuel pump. Forza Race Flow Headers: 1-7/8” Primaries to 3” collectors through to a 2-1/2” Barrer? Race muffler system.
