Brent Lykins
Prep:
It’s for forum customer and his ’65 F250 that he tows with. He’s going to replace a tired 352 and really up the ante.
Engine is a 482, BBM block, 4.250″ bore, with a Scat 4.250″ steel crank, 6.700″ rods, and Racetec 30cc pistons (9.7:1).
Heads are also BBM pieces, as-cast with a good valve job, seat blend, etc. Intake manifold is a Performer RPM and I’ve got a
Quick Fuel HR-780 to go on top.
Cam is a custom Comp hydraulic roller, 224/230 @ .050″, right at .600″ lift, with a 110 LSA. High quality parts everywhere,
including T&D rockers, Powerbond balancer, Moroso pan to fit his truck, Mallory distributor, and March pulleys.
482″ BBM block &
“as-cast” head.
DYNO:
It was an eventful day, which was good.
All-in-all, we tried a 1″ Super Sucker (which we kept), a 2″ Super Sucker (no changes), a 1″ open with a 1″ 4-hole on top (lost power),
and tried several different timing changes.
We were able to pull it down a little under 2500, which in my mind was sufficient. Water temp was kept at 180, so I feel confident that we dyno’d in “real world” conditions.
I had used a Melling standard volume pump and with the main/rod bearing clearances hovering right at .002″,
oil pressure went up steadily to 65-67 psi at the top of the pull, with a total of 6 quarts in the system.
Final timing was at 31° total. What’s interesting is that no matter what we tried (spacers, timing, etc.) it was just really consistent at the same horsepower/torque.
We think that the cam was just doing all it could do to fill the cylinders.
Very pleased with the results. Honestly, it was more than I expected…