Cam opinions 418

4eighteener said
I don't have to many pictures of the outside, tons of the engine rebuild though.
Rust free, great interior, decent paint.
The springs howards recommends for that cam has similar specs to the pac springs that come on the head.
I did find a table on the wallace racing calculator site where it would determine your valve events from the cam specs.
It came up with a abdc of 65, which when I plug into their dynamic ratio calculator gives me like 8:1 dynamic compression ratio and 165 cylinder pressure.
Pretty low for aluminum heads

View attachment 1716330268

Nice ride. I myself would still look for a more narrow LSA.
David Vizard has a formula that works very well and was shown on Engine Masters on the cam experiments they did. The lower LSA mom er provided more torque until the engine can up on the cams intended RPM range. The narrower LSA starts the air and fuel coming in quicker. At your exact unknown cubic inch engine, a 408 with a 2.02 valve is looking for a LSA of 105.02. DV suggest going down 1 number if it’s split between the normally seen even numbers. But you can have that custom cut for you if you wish.

A 408 w/a 2.08 valve is asking for a 105.68 LSA.
Personally a degree ether way is not going to be noticed and hard to see in a dyno graph.

Now a lot of people are going to jump to a conclusion here and say the idle will be a chopping PIA to tune and drive down low with. This is simply not the truth because the amount of overlap the cam has will be small because the duration- advertised and @ .050 will be small limiting the amount of overlap.

Also, FWIW, a header collector extension the same size as the collector (not the reduced that bolts to the header at the collector) should be added into a torque cancellation box to mimic the exhaust exiting into the open air. This makes max torque down low which a heavy vehicle like the Ram Charger will really like at no extra fuel used. Your just making the most of what is available with minor fabrication work.

PS, if your more than 408 cubes, it’s not going to matter much. If you were at 434 cubes, there is a small difference worth looking into.

What finishes the engine up? RPM & a 750? 1-3/4 headers?