Dave what I'd done for several years was take the standard oval port gasket and carve the intake using a dremel.

I went to order the DCOE style intake/exhaust gasket 99996-H1150C and was told it's no longer available.

I've ordered 2 GX manifold gaskets from Bprojects.

This post is just a FYI.

I totally forgot that Mitsubishi was sold as Dodge here in the U.S. which is really funny considering I owned a Plymouth Arrow for a few years.

D some of the weights are taken from Nissan manuals and 1200.com I believe the 80lbs on the 60 series may be wrong I think it's more like 60 but that's what I found.

I will be coming back to the post and correcting weights as I get a chance to actually weigh various components myself.



There are some weights that are semi educated guesses like the bare shell at 400lbs. That one was based on some member input.

There are others like the Cressida caliper which while lighter has few choices in pad materials; fine for street but not so much for track work.

Then there are others like the fiberglass trunk lid that saves a mere 4 pounds.

So what North American car uses 4G32B engine/pistons?

Here is a list of weights I complied over the years. Some are from manual and some are from weighing them. these may not be 100% but it will at least give people a guide as to how much weight savings they might achieve. Note some things I don't have weights for.

Datsun 1200 Component Weight in lbs
Alternator 8.5
Denso Lightweight 5.5
Battery, Grp 24 36
Battery, Grp 51 (Civic) 26
Battery Miata 25
Battery, AGM UB12180 14.3
Battery, lawn tractor U1R-1 17
Battery, lawn tractor U1-9M 13
Battery, Lithium 2.3
Battery Tray
Bolts, misc
Block, A12 70.4
Block, A14 / A15 (w/main caps)73
Brake Drum, Alloy 240Z 6.45
Brake Drum, 1200 9
Brake, Caliper, 1200 5
Brake, Caliper, 280ZX 10.6
Brake, Caliper, 81 Cressida 7.95
Brake, Caliper, Wilwood 4.1
Brake, Master Cylinder ??
Brake, Rotor, 1200 9.7
Brake, Rotor, 280ZX 10.86
Brake, Rotor, slotted 280ZX 10.15
Brake, Rotor, 280ZX turn 18MM 9.72
Brake, Rotor Willwood w/hat 8
Brake, Hub, 280ZX 5
Brake, Hub, 280ZX Alloy 3
Bumper, Front 6.6
Bumper, Rear 8.14
Clutch Master ??
Clutch & Presure Plate 7.92
Connection Rod A12 0.946
Connection Rod A15 1.1
Control Arms
Crankshaft A12 23.76
Crankshaft 70mm w/sclp throw 20.9
Crankshaft A14 26.2
Crankshaft A15
Crossmember 10
Cylinder Head, Complete GX
Dashboard
Differential, H145 Steel carrier 92
Differential, H165 Steel carrier 114
Differential, H190 Alloy carrier 96
Door, bare 30
Door, bare -wdw frame,impact-bar,cut inner panel 24
Door, complete 40
Door Hinge 1
Driveshaft
Engine, Complete A12 w/header,FCR carbs, Alt, oil, no starter 171
Engine, A15 same as above, +12lbs 183
Engine, Complete, A12 192
Engine, Complete, A14 205
Engine, E15/13 161
Engine SR20DE (complete)330
Exhaust w/muffler
Fender, Frt Coupe steel 8
Fender, Frt Coupe, fiberglass 4
Fire System Halon 15
Firewall, rear alloy
Flywheel A12 20.8
Flywheel (lightened pr manual) 14.1
Flywheel A15 22.3
Flywheel tilton 5.72
Fuel Cell 5 gallon 29
Gasoline per gallon 6.3
Grill
Harness, cam lock 10
Harness, latch lock 7
Header / Extractors
Headlight, Assembly 5
Hood, Steel 21
Hood, Fiberglass 9
Horn 0.5
Manifold, Exhaust
Manifold, Extractor/Hdr
Manifold, Intake, Rnd Port
Mirror, Wink rear view 3.2
Mirror side view 1
Oil, 20w50 per gallon 7.34
Oil, 10w30 per gallon 7.26
Oil, 60w per gallon 7.49
Oil, 90w per gallon 7.5
Pedal Set
Piston, 73mm cast (w/rings & pin)0.726
Radiator, GX
Radiator, Standard
Radiator, Aluminum 3 core 11
Radiator, Standard (B14 Sentra) 15
Radius Arms
Rollcage, Autopwr 6pt 1.75 x .120 100
Rollcage, 8pt 1.75/.120 (rally spec) 124
Rollcage, 8pt 1.50/.120 revised 106
Rollcage, 8pt 1.50/.120 revised 85.56
Seat, Driver/Psngr with rails , each 22
Seat, Rear 26
Shell, Bare 400
Shock, Rear 3.16
Spring, Leaf 21
Spring, Leaf Composite
Spring, Pad 5
Spring, Shackle, set
Starter (early manual) 10.1
Starter (Auto) 11.9
Steering, Box 13
Steering, Column
Steering, wheel
Strut, assmebly 1200
Strut, assmebly 280ZX W/brakes 55
Sway Bar, Front 7/8 12.25
Sway Bar, Front 5/8 6.5
Tailight
Tank, Fuel
Tank, Fuel Cell (5 gallon) 19
Tie rods & drag link
Tire, 185/60-13 Hoosier TD 11
Tire, 155/80-13 Generic 13
Tow Hook 1
Traction bars
Transmission, 56A 4 speed 39.2
Transmission, 56A 5 speed
Transmission, 60L 5 speed 54.6
Transmission, 63 5 speed 80
Trunk Lid, Fiberglass 8
Trunk Lid, Steel 12
Undercoating/sound deadening
Valance 5
Water, per gallon 8.3
Wheel, 13" Watanabe Magsm 7.1
Wheel, 13" (Hotwire) 13
Wheel, 13" (Hotwire) w/Str TD 185/60
Wheel, 13" (CSSR) w/Str TD 185/60
Wheel, 12" steel 9.24
Wiper, Motor 2.5
Window, Door 5
Window, Mech 5
Window, Net Release Bar
Window, Rear 8
Window, Rear Lexan 4
Window, Side 5
Windshield
Windshield, gasket
Wiring, Harness

Dave are the K15 pistons heavier? I seem to recall looking at forklift pistons years ago but they were heavy.

As for quench; on the two stroke bikes and my F500 it's one of the things that are checked when building a motor.

The issues caused by decking the block and milling heads to me are not worth the trouble they bring.

D I appreciate the information but I'm looking for off the shelf parts. I'm looking to get the max performance from what parts are readily available, if that maximum is a few horsepower less than custom parts so be it.

It looks like 76.75mm pistons are available via eBay, they appear to be the 1mm deep,dish which are around -2.75cc and with those it's possible to get the compression up to 10-1.

The goal is to get a near as possible 1300cc putting out around 90whp. The 1171cc GX motor with the flat slides and ported head made 73whp, so I think it's doable.mthe motor going in the car now is probably near 80whp.

I won't be doing anything until after my next race; I previously made the top 6 overall in the small bore group with the A12, I was finishing 12-15 seconds ahead of the cars behind me and about 12-15 seconds behind the cars ahead of me. If I manage the top 5 or 6 then I will leave the motor alone unless I'm within 4-5 seconds of the next group of cars

As I'm planning on making some kind of motor swap in the next 24 months I'm not looking to order another set of forged pistons.

Rockauto has 76.75mm pistons but obviously those are lower compression; even with a .6 head gasket the compression will only be 9.5-1 so I was hoping to get the comp up to 10-1 without resorting to ordering custom pistons.

Now that I'm putting the A12 back in the car it bumps me down in class and back into the small bore group (I was in with the 2.0 liter cars). I can run up to 1300cc

I also have an A12A bottom end that could be over bored. So are there any off the shelf pistons with 75-77mm and 32.5 pin height that are flat tops?