340 Head/Cam upgrade before vs after with results
Without trying to make this any longer than necessary, here goes:
This 340 is an older build done by another reputable shop 10-15 years ago, owner never had it dynoed and drove it on the street in a Barracuda '67-'68 notchback I believe for some years. He is in the process of re-vamping his 'Cuda (Alter-K frontend) etc.. Earlier this summer he decided to bring the engine in for dyno testing as it was. The engine performed well for a 344 cube engine with some time/miles on it. (Very little blow-by, good oil pressure, smooth, consistent).
After the dyno session the customer decided he wanted the engine to be somewhat stronger and a plan was hatched once he sourced some head castings online--this snowballed into a cam/lifter change to a solid and some 273 mechanical rocker arms as well as a 650 HP dbl pumper. He entrusted me to work the heads, pick the cam and make it all fit, then re-dyno it.
Old build 340 .030" Old school TRW slugs, 915 J heads or X heads--(customer took them off at home ) Big Mopar .508" 292/292 108 hydro cam, LD4B intake, 3310 750 Vac carb, 1/2" open spacer, Compression ? runs great on 91 pump. Dyno peaks of 365.8 hp @ 6200 rpm and 357.9 tq @ 4700 rpm--Not bad really. To be cont'd J.Rob
Without trying to make this any longer than necessary, here goes:
This 340 is an older build done by another reputable shop 10-15 years ago, owner never had it dynoed and drove it on the street in a Barracuda '67-'68 notchback I believe for some years. He is in the process of re-vamping his 'Cuda (Alter-K frontend) etc.. Earlier this summer he decided to bring the engine in for dyno testing as it was. The engine performed well for a 344 cube engine with some time/miles on it. (Very little blow-by, good oil pressure, smooth, consistent).
After the dyno session the customer decided he wanted the engine to be somewhat stronger and a plan was hatched once he sourced some head castings online--this snowballed into a cam/lifter change to a solid and some 273 mechanical rocker arms as well as a 650 HP dbl pumper. He entrusted me to work the heads, pick the cam and make it all fit, then re-dyno it.
Old build 340 .030" Old school TRW slugs, 915 J heads or X heads--(customer took them off at home ) Big Mopar .508" 292/292 108 hydro cam, LD4B intake, 3310 750 Vac carb, 1/2" open spacer, Compression ? runs great on 91 pump. Dyno peaks of 365.8 hp @ 6200 rpm and 357.9 tq @ 4700 rpm--Not bad really. To be cont'd J.Rob