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alsadler 07-24-2012 02:44 PM

283 cc spark plugs and gap
I have a 283cc in a pickup with 40000 km on it but it has been modified from origional. it has a block vin from 1962-1964 but looks like 1980's top end and has an HEI distributor. how do I dertermine the spark plugs and gap for this configuration. The vacuum gauge is showing late timing, is this due to my gap? Does not seem to have much balls but it starts and runs o.k.

AutoGear 07-24-2012 03:50 PM

Why do you have a dirtbike engine in your truck? 283cc shaft drive?

alsadler 07-24-2012 03:58 PM

283 cubic inch 4.6 L engine

Richiehd 07-24-2012 04:39 PM

If its got the original style heads on it, you will want to use short thread 13/16 style spark plug. Not sure of the number A/C 45R maybe. Open the gap up from .035 to .045 to take advantage of the HEI. Then you can bump the timing up some to get more power.

F-BIRD'88 07-24-2012 06:35 PM

Remove a valve cover and ID the cylinder head casting number.
Its between the valve springs on the top of the head.
With This I'll tell you what plugs to install.

Engines with a non stock cam with increased duration and overlap
show less manifold vacuum at idle.
Such engines also want an increase in the spark advance at idle.

They run much much better when the distributor mechanical and vacuum advance curves are recurved to suit the non stock performance cam.

Spark plug gap will be .035" reguardless of points or HEI.

alsadler 07-24-2012 07:57 PM

the top half of the motor looks like it is fron early 1980's but how do I find out what the heads are? where do I find the numbers and reference them?

F-BIRD'88 07-24-2012 08:26 PM


Originally Posted by alsadler (Post 1576806)
the top half of the motor looks like it is fron early 1980's but how do I find out what the heads are? where do I find the numbers and reference them?

Right here just need that cylinder hed casting number.

vinniekq2 07-24-2012 10:50 PM

when I had a 283 I used AC45s no r. Didnt have a radio,lol. Champion plugs did not work well,autolites fair and NGK worked well.I was using points.HEI might be a lot more tolerant of different brands. The 283 does not make much power stock. A decent cheap head for a 283 is the stock 1.94 camel bump heads.You could easily make 235 plus horse power and not much torque,smooth and fun to drive if the car is under 3000 pounds

F-BIRD'88 07-25-2012 03:37 AM

Champion plugs did not work

I have been using Champion spark plugs for over 40 years and never had a bad one.
In engines of all types.

alsadler 07-25-2012 02:19 PM

it is in a pickup at 4000lbs the old truck with the 4.3l had more power than this.

alsadler 07-25-2012 04:34 PM

took the valve covers off and the number on it is 14014410 what year is this?

alsadler 07-25-2012 05:25 PM

head number may also be 14014416

F-BIRD'88 07-25-2012 09:54 PM


Originally Posted by alsadler (Post 1577077)
head number may also be 14014416

use a champion RV8C or AC delco R42T or R42TS, NGK BPR6FS autolite 144 or 23
Gap at .035".

If your 4000 lb+ truck has a hiway rear gear ratio and tall truck tires its going to be a bit lame with a small CID motor.

lil 283's like to rev.

This is a ideal engine to supercharge to get big truck power and torque out of
a small package. Just right for a 142 weiand blower.
a low engine compression ratio is desired for supercharging 8.5:1 or less.

the #4416 "305HO" cylinder heads make a lot lot more power on any engine once they are fully home ported larger 1.94x 1.60" valves are ideal.
poewrfull heads on a 283 once tweeked by hand.
A diamond in the rough. Its up to you to bring out the power potential in them.

does your 283 have a flat top, dome or a dished piston?
head gasket thickness? any head shaving or block shaving done.

establishing the true engine compression ratio is critical.

truck gear ratio and tire diameter?
very easy to over cam a 283 in a truck. big cam needs big gears, high stall converter and more than stock compression.
all more critical in a 283.

The wrong converter and gears with a cammed 283 in a truck will suck.

What is the manifold vacuum at 1000 rpm?
what is the spark timing at 1000 rpm (no vacuum advance)
what is the idle rpm and idle base timing.?
idle rough/lopey or smooth?

Engine cranking cylinder pressure diagnostic test.... psi
Other engine details, transmission etc.

alsadler 07-26-2012 02:03 PM

Can not seem to keep it running when it is put into drive, keeps stalling and missing when driving. Have not checked the distributor or rotor yet and the carb was on my 4.3l worked well with it. also choke light is always on on the dash even though the choke is not on, light goes out when it is unplugged.

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