So there's the question. This is the first stroker build for me. After comparing notes with very similar builds it seems to be missing 50-75 horse easy. Even the owner of the engine shop/dyno felt it was lacking greatly. It fired right up and break-in was flawless, runs smooth after ten pulls this dyno sheet below was the best we could do, and that's with their 1000cfm carb and a 2" spacer. 574hp and 605tq is all it had. Changing from the 950 quickfuel to their 1000 holley gained it only a couple HP difference, hardly noticeable. Engine liked 30deg of timing the best. At 32deg, it lost 4hp and 2tq and kept loosing power with any increase in timing. This is a very reputable shop that does many big HP engines, so I trust their equipment. The shop owner could only speculate that I was somehow given the wrong pistons and have something like 9:0.1 compression, which is a piston 440 source offers as an option. I will be calling 440 source on Monday to see if there was any chance this could be the case.
-1978 440 block bored .30 over
Lined honed and deck just cleaned up. Bearing clearance at .00275-.003
-440 source 512 stroker kit with 78cc pistons for a com ratio of 10.6:1
- 440 source stud girdle
- ARP studs on mains and everywhere else in engine
-Untouched Trickflow 240 heads
- .040 MLS head gasket
-Cam is a custom grind Howards Solid FT
Lift .599in .620ex 110 lobe sep
Duration @ .50 254/262
Lash set to .016 cold as it calls for .018 hot
-Rocker arms are PRW 1.5 ratio steel roller with B3 racing spacers for correct geometry which caused me to loose about .025 lift which puts me closer to .574in / .595ex
-Smith Bros 3/8" dia push rods
-Headers 2"
-Victor intake
-Carb Quickfuel 950
-All MSD ignition
-6qt pam
-Melling high volume pump
-Brad Pen 30weight break in oil
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