Here we go again
A couple pics of the ported SB RPM heads currently on my 360 from about 5 years ago when I first got them back from the shop after porting, seats cut, new valves, springs, hardware. Angles aren't really great for seeing the bowls and I didn't feel like removing the valves to see from that side but I figured I'd post to view as a comparison and maybe get some opinions. Guy who did them (Bret Bowers at Atlas Perf Machine in Longmont, CO) said he felt like they'd barely flow better than stock 340 heads if these hadn't been ported lol. The engine made 286 HP uncorrected at the wheels at 5000' elevation with a 222/226 @ .050", ~.550" lift on 110 LSA hydraulic roller cam with RPM intake, 750 cfm Street Demon carb and Hedman shorty headers going into 2 1/4" downpipes with tight-radius bends to clear steering linkage. Short block is a stock 5.9L Magnum with .027" head gaskets so compression is only about 9:1 and it is hooked to a 904 with a cheap 2600 RPM stall converter. Now here at basically sea level I'd bet it's closer to 350-370 WHP. Also have a set of Doug's D-453 headers I hope to put on at some point that I think will free up a good bit of power.
A couple pics of the ported SB RPM heads currently on my 360 from about 5 years ago when I first got them back from the shop after porting, seats cut, new valves, springs, hardware. Angles aren't really great for seeing the bowls and I didn't feel like removing the valves to see from that side but I figured I'd post to view as a comparison and maybe get some opinions. Guy who did them (Bret Bowers at Atlas Perf Machine in Longmont, CO) said he felt like they'd barely flow better than stock 340 heads if these hadn't been ported lol. The engine made 286 HP uncorrected at the wheels at 5000' elevation with a 222/226 @ .050", ~.550" lift on 110 LSA hydraulic roller cam with RPM intake, 750 cfm Street Demon carb and Hedman shorty headers going into 2 1/4" downpipes with tight-radius bends to clear steering linkage. Short block is a stock 5.9L Magnum with .027" head gaskets so compression is only about 9:1 and it is hooked to a 904 with a cheap 2600 RPM stall converter. Now here at basically sea level I'd bet it's closer to 350-370 WHP. Also have a set of Doug's D-453 headers I hope to put on at some point that I think will free up a good bit of power.
