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My 283 is taking shape.
#1418161 Mon Jul 26 2021 02:12 AM
Joined: Sep 2011
Posts: 2,256
L
Lugnutz Offline OP
'Bolter
I bought a zero mile 1966 283ci with 0.040 pistons that was still on the Jasper rebuild shipping crate. I unwrapped it and soon found issues. One side had a higher compression power pack head. The other a lower compression head. Mismatched heads? Yes. I found a single matching power pack head on eBay. Same year and everything. Good.
Pulled both Jasper heads this weekend which gave me a good look at the cylinder walls.
I have another 283ci at the machine shop. It’s a complete 1965 283ci that’s never been rebuilt. Powerpack heads. Carb to pan. It’s getting a mild performance cam with a little lope in it.

I plan to pull out the cam in the 1966 Jasper 283ci because I have no idea what it is. Then I’ll bolt on the heads. More to come.

Attached Files
A1E8CFE9-1830-4F9C-A329-9E4527F9C4A7.jpeg (223.99 KB, 231 downloads)
9C4D591C-08A7-40B5-B9E2-42D48651EE0C.jpeg (343.59 KB, 229 downloads)
B78AEFF2-3FB3-4E39-99C1-219E920CEA37.jpeg (270.78 KB, 226 downloads)
C5158CF7-22AF-4174-BD46-FB7E09E4106F.jpeg (246.94 KB, 226 downloads)
5831998D-770A-4781-B400-EFAA7B04CAB6.jpeg (224.38 KB, 224 downloads)
Re: My 283 is taking shape.
Lugnutz #1418167 Mon Jul 26 2021 02:56 AM
Joined: Feb 2004
Posts: 22,980
H
'Bolter
283's have always been a favorite engine of mine. With the PP heads, you'll probably have enough compression to need to run mid-grade, if not premium gasoline. I think they gave the original engines around a 9.5:1 ratio, right on the ragged edge of detonation problems with regular gas. The 40 overbore will also raise the compression slightly. Putting in a slightly longer-duration cam will mitigate that a little, since the intake valve doesn't close until partway up the compression stroke and lowers the effective compression pressure a little. I like the Comp Cams 260 degree cam to give an engine bit more performance without creating enough idle lope to make leaving a stoplight or driving in traffic difficult.

Have fun!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: My 283 is taking shape.
Lugnutz #1418885 Sat Jul 31 2021 04:30 PM
Joined: Dec 2018
Posts: 760
F
'Bolter
Lugnutz Lookes like a simple and fun build,clean parts should run like a charm. I assume Jasper regrinds their own cams. Would look at cam and lifters,see if the cam is parkerized (that black coating) .

Re: My 283 is taking shape.
fixite7 #1418892 Sat Jul 31 2021 04:47 PM
Joined: Sep 2011
Posts: 2,256
L
Lugnutz Offline OP
'Bolter
I’m preparing things a piece or two at a time.
Power pack heads are bolted on with new head gaskets.
I oiled the cylinder walls and turned the crank by hand. Rockers are not bolted down yet. Good steady compression.
While rotating the crank I used a dial indicator to get a ballpark idea of what cam Jasper used.
The #2 cylinder exhaust lifter moved 0.268”. The intake lifter moved 0.255”. Again, it’s just a ballpark idea but it seems like it’s a factory cam.
Cleaning up an intake and water pump too.
Soaked the intake all night in a vinegar bath. Gets the rust out of the intake passages. Neutralize with baking soda bath. Then propane torch to dry quickly to avoid flash rust. Cool. Primer. Dry storage until time to paint.

Attached Files
4D78D203-19FA-4A6F-B3CB-9545EAD4CF30.jpeg (295.69 KB, 145 downloads)
13B81996-0FB4-4704-882D-FE726CBB102B.jpeg (268.84 KB, 145 downloads)
9D18A7F9-491D-4677-90E7-764BA0BEA05C.jpeg (173.84 KB, 145 downloads)
8F45884C-FF4B-4BA0-847B-496BD81754AD.jpeg (260.05 KB, 144 downloads)
Re: My 283 is taking shape.
Lugnutz #1422324 Sun Aug 29 2021 08:44 PM
Joined: Sep 2011
Posts: 2,256
L
Lugnutz Offline OP
'Bolter
I did a cam swap and installed a new double chain timing set today. The cam thrust button I bought is too short, but at least it wasn’t very expensive. After installing the thrust button I had A BUNCH of endplay. I stuck a long screwdriver down the distributor hole and pushed on the timing gear. It moved a lot. I’ll have to buy a longer button.

Attached Files
B730410C-4DB2-4C91-8A9A-90DE04D1864A.jpeg (257.59 KB, 105 downloads)
646F12AC-74B3-4BE6-AD4B-254FF48889FB.jpeg (202.95 KB, 105 downloads)
05C9AFFC-222A-4196-8DCB-A0B194362EC7.jpeg (233.11 KB, 104 downloads)
CE9E51CB-995F-4951-BE7E-DFAFFA2D5F61.jpeg (156.58 KB, 105 downloads)
Re: My 283 is taking shape.
Lugnutz #1422325 Sun Aug 29 2021 08:54 PM
Joined: Mar 2004
Posts: 5,215
M
'Bolter
Jay, what's the 5th picture show? These old eye's can't read that small print...lol

Mike B smile

Re: My 283 is taking shape.
Lugnutz #1422326 Sun Aug 29 2021 09:02 PM
Joined: Sep 2011
Posts: 2,256
L
Lugnutz Offline OP
'Bolter
I blew it up a bit.
It shows the lift, duration, etc for the GK 930 cam I installed.
Intake duration 0.195
Exhaust duration 0.202
Intake valve lift 0.390
Exhaust valve lift 0.410
Lobe separation 112*

Attached Files
Re: My 283 is taking shape.
Lugnutz #1422327 Sun Aug 29 2021 09:07 PM
Joined: Mar 2004
Posts: 5,215
M
'Bolter
Thanks Jay...you typing it out made it easy to read... thumbs_up

Mike B smile

Re: My 283 is taking shape.
Lugnutz #1423050 Sun Sep 05 2021 08:34 PM
Joined: Sep 2011
Posts: 2,256
L
Lugnutz Offline OP
'Bolter
I replaced the factory cam with the GK 930 cam and installed a cam thrust button. My first cam thrust button was the “short” version, so I needed to spend another $13 and get a longer button. I couldn’t get my dial indicator positioned to measure endplay with the new cam button. So I just trimmed the button down very gradually so there is no endplay with the timing cover gasket OFF, but a teensy bit of endplay with the gasket installed.
Next comes the lifters and pushrods. My reading says to tighten the rocker nut until no lash plus 1/2 turn.

Attached Files
Re: My 283 is taking shape.
Lugnutz #1423100 Mon Sep 06 2021 04:14 AM
Joined: Sep 2011
Posts: 2,256
L
Lugnutz Offline OP
'Bolter
Got more done. The Corvette valve covers are temporary.

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