Heres the rundown on another 455 alum stg-1 head motor. Wiseco flat top pistons netting just over 12to1 compression. Alum st-1 heads flowing 338 on the intake and 238 on the exhaust. Block is hard blocked and halo girdled, upgraded rods. Sp1 intake dominator style but runnign a 1000cfm demon carb. Hydraulic cam, 255/265 @.050 lift with .568 intake lift and .568 exhaust lift. Fully Dry film lube coated, as well as crank bearings. At aprox 1/2 throttle this thing makes 465 ft/lbs of torque at 2600 rpm. On the pulls it made 622 ft/lbs of torque at 4300 rpm, pretty much held that through 4800 rpm and made 658 horsepower at 5900 rpm. It breaks through 500 horsepower at just a hair over 4100 rpm. We are using the oil scavenger plate on this one. Bearing clearances a re .003 on the mains and .002 on the rods. Idles at a tick under 40 psi, any blip of the throttle puts it over sixty, at rpm it is making 80 to 85 psi , reading taken at the rear of the block. I had to really back off the adjustable regualtor and am using a slightly shortened non stg-1 oil pressure spring. This thing ought to get some attention at the local cruise in don't ya think? Jim Burek P.A.E. ENTERPRISES
The scavenger plate replaces the oil filter housing , it uses an external oil filter. Also uses external oil pick-up from the oil pan to the scavenger plate. It takes all the 90 degree bends out of the oil system through the housing. Jim Burek
:jd: :jd: :jd: :jd: Jim, How many inches of water are those heads measured at? Are you using the larger than stage1 valves? Those are huge numbers!
Jim, A couple of questions regarding the pistons; 1. Do you do any massaging of the flat tops? They seem to have some pretty sharp edges around the valve reliefs. The dished pistons don't look as severe. 2. What cc and deck height do you use to get the 12:1? With the dished version, what cc and deck height gets you around 10:1?
:jd: Are those numbers at altitude? Any pics of the scavenger system? I'm using the system shown here: http://www.v8buick.com/showthread.php?s=&threadid=38774 ...trying to figure if this scavenger would work with the spin-on filter adapter I have now to help eliminate a couple of 90's...
Jim, How about some dyno results for us 350 guys? I'm always hearing about the potential of our small blocks but have yet to see any #'s posted. Us little guys would be very appreciative. Aubrey
The numbers are corrected to sea level. I can post a picture of the scavenger plate if someone tells me how to post pictures to this site, I've tried in the past and can't get it to go. Jim Burek
Stay tuned , the next motor on the dyno will be our wiseco piston 350 deal. Will hopefully start dynoing this comming weekend. Jim Burek
Jim - Email any pics you want posted and/or resized to gsxmen@sbcglobal.net - I'd be glad to post them for you.
Hi Jim, just for giggles do you have a educated guess on the power difference from this motor to the same motor with a decent set on iron stg1 heads? I am just wondering. Tom W
Tom, hard to say for sure, but just calculating off the flow of these vs a set of iron stg-1's at say 280 cfm, I would guess you could easily see an 80 to 100 horsepower difference. Agian, there is so much power to be had in a good set of heads, plus the exhaust flow on the alum stuff is so much better. Alot of this guesstimate comes form looking at past engines done with iron heads vs current engines done with alum heads. Just my opinion here. Jim Burek
Hi Jim, Iwas just wondering, I kinda figured you might have a guess from past motors you have done. I need to rob a bank or something to get some of those heads I probably would be knocking on the 10 sec door with my street car or break everything behind the motor, lol Tom W
Ok , here's some pics of the scavenger plate system. The baided steel line is from the oil pan sump to the inlet of the plate, the gray line is oil out, to the remote oil filter , then back into the block where the orinal sending unit used to be. Jim Burek
Nice pan on that engine Jim. Do you tap the pan on the rear, bottom, or side? Any pickup screen or is it direct draw? Nice numbers on the engine. Gotta love these aluminum heads!! Put that baby in front of a geared 400 with a gear vendors unit and a set of 411's!! SCREAMER!!
Nice work Jim:TU: That is definitely a nice strong engine. Hopefully by months end I will also be posting dyno numbers on my project. Stage 1 TE heads 14.1 comp. Goal is min. 750 hp. definitely not a street engine...(geez I miss those days) Once the dyno figures are out I will then put out all the other data, such as flow numbers, engine spec, etc. along with who did what and what parts. This way there will be no speculation, doubting, guessing posted on the board. Also I will have the heads flowed at two entirely different places. Anyway, Jim, again great job on the engine! Rick Martinez
The oil lines hooks to the back right hand corner of the pan, comes out the side. It's a steffs pan. It came with a cone type screen for the pick-up but I did not like it, I think it would be too restrictive, so I pitched it. The pan has a windage screen inside. Jim Burek
