C code pistons - Page 2 - Vintage Mustang Forums
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post #16 of 31 (permalink) Old 05-26-2019, 06:12 PM
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Originally Posted by PA_cob View Post
Ok I measured piston depth at bottom and top of the stroke and the difference is 2.87. That is exactly that of a 289 stroke. So now I am certain that I have a 289 with flat top pistons.
Well if you're interested in determining if the block is original to the car look at the assembly date tab and see it's within 30 days of the assembly date of your car.
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post #17 of 31 (permalink) Old 05-26-2019, 06:29 PM Thread Starter
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post #18 of 31 (permalink) Old 05-26-2019, 06:42 PM
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post #19 of 31 (permalink) Old 05-26-2019, 06:45 PM
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While you have the tools out check the deck clearance.
Ive heard low CR cars from the '70-80s ping @WOT so dont put much stock in that.

Its all come up before https://forums.vintage-mustang.com/v...ml#post4068516 Im in the believe what you wish category, just don't try to convince me.

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post #20 of 31 (permalink) Old 05-26-2019, 06:46 PM
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Did a little snooping since you didn't put it in the thread, a '65 Mustang. No way that's original...

So yes, it could be a '67 289 A code that hasn't been rebuilt that someone put in the car.

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post #21 of 31 (permalink) Old 05-27-2019, 01:03 AM
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What is the casting codes on the heads? It would appear that you have either one of two possible scenarios.... a VERY EARLY '68 model year engine salvaged from a wreck with low miles, or a '65-67 "service" engine or short block that was cast while there were still "289" blocks available. I'd also check the block assembly date stamp as well as look for a partial VIN at the back of the block.

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post #22 of 31 (permalink) Old 05-27-2019, 02:08 AM Thread Starter
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The passenger side head was cast in March of 65 and the driver's side head was cast in October of 65. I tried to find the assembly date on the block but didn't see it. It very well could be an early 68 model using the last of the blocks. It has WF cast in the valley so that tells me it came from the Windsor factory. From my understanding they had an abundance of 289 blocks and cranks and were making them well after the Cleveland factory started making 302s.
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post #23 of 31 (permalink) Old 05-29-2019, 02:49 PM Thread Starter
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@Woodchuck I finally found the assemble date stamp. It was hiding under some paint.

8F4X

Looks like the engine is indeed a 68 model year engine. I had a few things come up and haven't been able to get the top end back together yet. I have time tomorrow so am going to clean up and lap the valves, then do a little porting and clean up of the intake, heads, and manifolds. Then put everything back together. Also it appears that coolant leak actual was from the intake manifold not the head gasket. Either way I got to see what I really have under the hood and do some needed porting. I should feel a little bit of a seat of the pants power increase.
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post #24 of 31 (permalink) Old 05-29-2019, 03:29 PM Thread Starter
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Ok so I did some research and saw that there was no A code 289 produced in 1968. Yet I have a flat top piston. I originally did not see any stamping on the pistons, but I was looking at the center of the pistons. I started to suspect the I was wrong about the piston, so I took a wire brush a gave a piston at top of the bore a good cleaning. Low and behold is see its stamped 273AP and .040 near the top. So its got Sealed Power 273AP cast pistons and bored .040 over. This is a rebuilt engine. No wonder its in such good shape. No clue on how many miles it has but I myself have put at least 10,000 on it over the past 2 years. Thanks guys for the help on finding block number and etc.. I am curious now as to what kind of compression ratio this thing has with stock 1965-66 289 heads.
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post #25 of 31 (permalink) Old 05-29-2019, 03:48 PM
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Those are aftermarket replacement pistons in standard bore size. Look on page 8-69 and 8-71 in the 1965 Ford Mustang Shop Manual. The original pistons had no valve reliefs, only the notch indicating forward.
"D" code ( 210 hp) four barrel 289 pistons did not have Valve reliefs , A & K codes did have them.
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post #26 of 31 (permalink) Old 05-29-2019, 03:50 PM
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Measure the distance from the tops of the pistons to the deck of the block (deck clearance) at TDC, then find published gasket thickness (of the gasket you want to use) and cc volume of the dished pistons. As for the head cc volume, a google search will get you the range for the heads, or you can pick up a kit so you can measure them yourself.

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post #27 of 31 (permalink) Old 05-29-2019, 04:03 PM
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The only 302 with flat top (except for the valve reliefs) was the 68 J code 302 4V. Of course, the 289 and 302 have a different wrist pin location, except the BOSS 302.
I think you mean the 289 and 302 have the SAME compression heights ( 1.610 pin location) except the Boss 302 1.545. The ROD was different on the 289 ( 5.155) and the 302 ( 5.090 except Boss 302 , 5.155 like the 289) I'm positive you know that , I'm just trying to clear up any confusion. NOT meant as negative criticism at all.
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post #28 of 31 (permalink) Old 05-29-2019, 04:12 PM
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Originally Posted by PA_cob View Post
Ok so I did some research and saw that there was no A code 289 produced in 1968. Yet I have a flat top piston. I originally did not see any stamping on the pistons, but I was looking at the center of the pistons. I started to suspect the I was wrong about the piston, so I took a wire brush a gave a piston at top of the bore a good cleaning. Low and behold is see its stamped 273AP and .040 near the top. So its got Sealed Power 273AP cast pistons and bored .040 over. This is a rebuilt engine. No wonder its in such good shape. No clue on how many miles it has but I myself have put at least 10,000 on it over the past 2 years. Thanks guys for the help on finding block number and etc.. I am curious now as to what kind of compression ratio this thing has with stock 1965-66 289 heads.
Pretty close to 10-1 given the "tolerance" stack up. The A code was rated at 10.5 "in the day" but that was when the "blueprint" tolerances were used for calculation of compression ratio.
Randy

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post #29 of 31 (permalink) Old 05-29-2019, 04:23 PM
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The 65 heads have smaller combustion chambers than the 68 heads so that's a plus for the compression ratio.
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post #30 of 31 (permalink) Old 05-29-2019, 05:19 PM Thread Starter
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Somewhere around 10:1 was what I was thinking as well.
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