400-470 stroker build--results

Like title says , I thought seeing what went into this build would be of interest to some so here is what it took to build a budget conscious Mopar stroker for use in the 2013 EngineMaster's Challenge.
The 3 main rules were 3000-7000rpm test range, hydraulic lifters, 11.5 comp, 1.75" throttle bore carb (Holley 950 Hp)

At the contest it made peaks of 755 hp and 674 lbs.

Rundown: 400 block circa '75 (short fill), stock steel 440 crank final cubes came in @ 466
Bore 4.361"
Stroke 3.900" (small error in offset resulted in .015" less stroke)
6.135" Scat BBC rods
Icon 826 pistons with 1.867" CHT
CompCam roller 256/260 @.050" .750/.708" 106 LSA
Custom 1/2" girdle with aluminum main cap spacers
internal oil p-u 1/2" NPT
Cloyes Hex-Adjust timing set
ProComp heads 2.25" (hollow stem) 1.75"
Indy 400-2 intake
Schoenfeld 1 7/8-2" dyno/sprintcar headers

This was to be our development engine to beat on trying different parts/configs. I had most of these parts on hand and wanted to get it together, test things out and then build a copy with much nicer parts and a few more tricks with what we learned testing this one.
I had this engine running late August and was surprised it made pretty good power considering the low buck nature of it. Our first test up to 6500 rpm netted peaks of 708 hp/638 ft/lbs @ 32 total.
Our first pull to 7000 rpm dropped to 508 hp @ 7000 rpm! Due to lifter instability.

This engine is absolutely wicked and revs like an ultralight smallblock. It becomes even more impressive when you consider that it uses a single Holley 950/hydraulic roller lifters/and a 256 @ .050" camshaft.



I know I am forgetting things to post about this build. Ask away. J.Rob

Here's the link with a couple of photos.

http://www.popularhotrodding.com/en...y_coverage/robinson_ruttler_auto_machine.html