skrews
Well-Known Member
So after 12 years of hotroddin/racing my junk and working at an engine shop I've amassed quite a collection of used/pulled off engine parts. Thought to myself why not build a motor with all this stuff thats why we save it right. So the plan became this, put together an engine with as much used, cast off, and factory stuff for as cheap as possible . I had a bunch of 360 cores so I plucked out the most used up one I had (already .030 over) not wanting to use a good one on a motor that was going to be built this cheap. Went through my crank collection and had a nice one out of a Magnum. Used the rods from the Magnum motor too, ground the balance pads off, polished the beams, resized with ARP bolts I pulled out of set rods that were improperly resized. Bought a set of Sealed Power hyperutectic 4 valve relief flat top pistons with moly ring set for $130 off Ebay. Also got the bearings and gaskets there for cheap too. Used a set of 596 heads with 1.88 MP valves I had on the shelf and 1.6 Milodon valves scored off Craigs list. Pretty good port job yielding 235/180 CFM @28" (192/131 CFM stock). Told myself I wasn't going to get carried away on the heads for this thing, but that didn't happen. Assembled them with some Comp 926 single springs and 10 degree locks/retainers I pulled off my worn out 340. Shaved them 50 thou. got to down to 57cc. The block got the full treatment sonic tested for good thickness, square decked, mains line honed, honed with deckplate. Weight matched the internals and balanced the crank with an LA 360 damper and B&M flexplate. Screwed the short block together with an OEM windage tray from the parts pile, a low mile Magnum oil pump, and a $45 Ebay oil pan. Used a .484 Purple Shaft cam and double roller timing chain I ran in my 340 for a season years ago. Just to satisfy my curiosity I mapped out the specs on that cam. Mopar says 284 advertised duration, 241 @.050, .484 lift. Wrong, its actually 294 adv., 238 @.050, .480 lift and 143 @.200. Thats a slow lobe profile, not sayin its a bad cam but it aint what Mopar says it is, and it aint what a lot of guys think it is when it comes to agressiveness I remeasured it 3 times to be sure. Compression worked out to 9.7 with my heavily cut heads and my .050 down the hole 8.5 comp. pistons. Capped it off with a spread bore iron 360 intake with the EGR junk plugged, the carb pad opened up to match a square bore adapter, and port matched ( had to slot the holes a ways ). Used a set of heavy duty stamped MP rockers and replacement pushrods out of my buddies blown up 360. Old M/T valvecovers from the swap meet. In to this thing for about $500.
On to the dyno with 1.75 headers and a 750 doublepumper on a 2" tapered spacer
428 HP @ 5700
449 TQ @ 4300
With an Edelbrock RPM Air Gap everything else the same
442 HP @ 6000
460 TQ @ 4700
In my 3350 lbs Duster it runs 7.5 at 89 1/8 mile and 11.8 at 112 1/4 mile
8" 4500 stall converter 904, 4.56 gear, 28" slick 1.57 60 ft. time
I figured that this thing would only hit about 375 hp and run mid 12s :toothy8:
[ame="http://www.youtube.com/watch?v=Zl2jA6zHDb4"]360 on the Dyno - YouTube[/ame]
On to the dyno with 1.75 headers and a 750 doublepumper on a 2" tapered spacer
428 HP @ 5700
449 TQ @ 4300
With an Edelbrock RPM Air Gap everything else the same
442 HP @ 6000
460 TQ @ 4700
In my 3350 lbs Duster it runs 7.5 at 89 1/8 mile and 11.8 at 112 1/4 mile
8" 4500 stall converter 904, 4.56 gear, 28" slick 1.57 60 ft. time
I figured that this thing would only hit about 375 hp and run mid 12s :toothy8:
[ame="http://www.youtube.com/watch?v=Zl2jA6zHDb4"]360 on the Dyno - YouTube[/ame]
