: 68 sedan deville 472 project



JiipeeH
06-09-10, 06:31 AM
Hello!

newbie from Finland is writing..
I have 68 sedan deville(non-ht) with 472 engine.
Doing overhaul for the engine and for the whole front of car(suspension,steering etc).
I have to overbore(.030") my block, Question is which piston I should use?
I dont want low compression ratio, since compression is not a problem, we only have 95/98/99 octane gasoline in Finland. Gasoline prize is 6.5$/gallon :banghead:
I dont care how much is mpg... since this car is a hobby car, not a car I use daily.

I already have forged I-beam rods(ebay ~200$, chinese crap.. :D) with arp bolts. Not a bushed full floating style.
So, from flashcraft RC cast pistons with 10.5:1 compression ratio or Keith black 472 pistons? KB has lower compression ratio -> how much I will loose hp/torque?
Other things: I have planned to put a mts #10 cam+lifters, new springs, oversize valves, flashcraft stage III adjustable shaft rockers, 902 76cc heads, headers with dual exhaust(no x- or h-pipe), hi-volume oil pump, cloyes timing set, hei/msd ignition etc.

Let me show some pictures:
front comparment, broken piston, rod journals

edit: those scrap dual exhaust which are on photo have gone to trash bin.. not mine job..

deVille33
06-09-10, 10:46 AM
JiipeeH,
Hi and welcome. I'll address the points you mentioned on a point by point basis.

Doing overhaul for the engine and for the whole front of car(suspension,steering etc).
I have to overbore(.030") my block, Question is which piston I should use?
I dont want low compression ratio, since compression is not a problem, we only have 95/98/99 octane gasoline in Finland. Gasoline prize is 6.5$/gallon
I dont care how much is mpg... since this car is a hobby car, not a car I use daily.

I already have forged I-beam rods(ebay ~200$, chinese crap.. ) with arp bolts. Not a bushed full floating style.

Why did you go with these? You state questionable quality. New / Used? Why not original rods?
If you question the strength of the rods, send them to a shop and have them maged and rockford tested.

So, from flashcraft RC cast pistons with 10.5:1 compression ratio or Keith black 472 pistons? KB has lower compression ratio -> how much I will loose hp/torque?

Are either of these hyperutechic or high silicone cast pistons or forged?

Other things: I have planned to put a mts #10 cam+lifters, new springs, oversize valves, flashcraft stage III adjustable shaft rockers, 902 76cc heads, headers with dual exhaust(no x- or h-pipe), hi-volume oil pump, cloyes timing set, hei/msd ignition etc.

Make sure your valve lift / valve size / cylinder head selection will allow clearance with whichever pistons you select.

JiipeeH
06-09-10, 12:43 PM
My rods are these:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=220608317389

So, should I use original rods instead?
I read on many places that 472/500 rod etc. are not designed to handle over 4000 rpm ?

deVille33
06-10-10, 09:51 AM
Stock rods could handle over 4000 rpm, but not for extended periods and most likely not on a daily basis. Depends on the weight of the piston. Not familiar with the rods you have. If they are all they advertize, they should be an improvement over stock rods. That said, they don't give you much. No assurances, guarantees, ratings, or recommendations.

deVille33
06-10-10, 10:06 AM
Here's an outline from a Hotrod article on the build of a performance 500.

505-Inch Pump-Gas Cadillac Engine - Full-Frontal Cadillac

BY THE NUMBERS
TORQUE INC. 505CI CADILLAC
Bore: 4.320-inch
Stroke: 4.304-inch
Displacement: 505 cubic inches
Compression ratio: 10.5:1
Camshaft: DRC solid flat-tappet
Cam duration: 258/258 degrees
at .050-inch tappet rise
Valve lift: . .630-inch
Rocker ratio: T&D 1.8 ratio shaft rockers
Lobe separation: 112 degrees
Installed centerline: 110 degrees
Top ring: .043-inch Speed Pro barrel face
Second ring: .063 Speed Pro scraper
Oil ring: 3mm
Piston: Diamond center dish forged
Block: OEM Cadillac 500
Crankshaft: OEM Cadillac 500
Rods: Scat/MTS 7.000-inch H-beam
Main journal: 3.240-inch
Rod Journal: 2.490-inch
Cylinder head: MTS/Bulldog
Intake valve diameter: 2.250-inch
Exhaust valve diameter: 1.860-inch
Intake manifold: MTS/Bulldog single-plane
Carburetor: CSU modified Holley 1050 Dominator
Header: Fab Shop 2-inch primaries;
3.5-inch merge collector
Ignition: ICE Ignition 10 amp
Damper: MTS
Water pump: MTS/Torque Inc.


On The Dyno Dts Dyno Data Torque Inc. 505CI Cadillac


Of course this is for a 500. Got this from another post 4 pages back, There is another on the same page regarding the single engine land speed record machine. It is interesting, but has few details regarding engine internals.