I was real excited when this crate arrived.
This is a Blueprint engines 427 LS. 625HP and 565 ft. Lbs of torque. I’m using their long block so I could select the external items to fit my needs. Its a LS3 based stroker that has an all forged bottom end, Mahle forged pistons and rings, ARP rod bolts, Melling oil pump, and 12 degree 255 cylinder heads that rotates the valve angle from the 15 degree angle of the standard LS3 to similar to the LS7.
The old and the new.
The one thing I missed during mock up that caused lots of head scratching and some challenges to overcome was the oil pan. I had a Holley 302-2 oil pan I used to mock up and it fit great. The longer stroke of the new engine didn’t clear the pan. The new Holley pan 302-3 is good for up to 4.00” stroke but I am at 4.125” stroke. The original Holley pan 302-1 would work for the engine, but the sump is too deep for my liking and hung below the cross member. In addition the front of the pan was to deep for my steering rack. So after looking into lots of oil pans I selected the Mast Motorsports stroker pan. I prefer the cast pans and it had all the clearance I needed or so I thought. For those studying oil pans here is a comparison to the 302-2 Holley pan.
The Mast pans have those kick outs in just the right places to clear the rods. I am using their pickup and windage tray as well, all designed for the longer stroke. The only thing I didn’t like about the pan is the cast in baffles but no trap doors for oil control. I was using the Improved Racing baffle trap door assembly in the Holley pan and I really liked it.