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Does a roller cam in a LA block incure about $1,000 of expense over a flat tappet? Cam specs are 288/292 .501/.513 lift. 230/[email protected] 9:1 compression yields 380+HP 410 TQ 10:1 yields 395+HP 435 TQ 4"stroke 9:1 magnum rt heads returns 435+HP 457tq

Crosswind makes an affordable Air Gap knock off for Magnum engines.

I believe the old 300hp/360 was pretty much stock 5.9 truck motor set up for carb.

I would make sure to have the magnum heads checked out. They are prone to cracking. Otherwise they are good motors. Roller cam. The heads flow well, and the R/T heads even better. If stud mount rockers bother you, you can get shaft conversions.