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Old 08-02-2011, 12:19 PM
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300ci Engine Specs

Anyone have a link/source for all the stock spec's on this engine. The usual, bore, stroke, chamber size, pistons, cam specs, anything I can punch in my dyno program for a baseline. While I know dyno programs aren't all that accurate, they do come in handy for seeing what happens when you change a part. I have everything for the small block six's, but info seems hard to find for the big six.
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66 Bronco Half Cab, 203ci I6, CI aluminum head and intake, Isky 256/256 cam, Keith Black pistons, Clifford header, Holley 390cfm 4v, 9.7:1 comp, DSII ignition
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Old 08-02-2011, 01:16 PM
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Here are the specs on the 4.9L 300 cid engine from the 1981 factory shop manual, does this help?

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Old 08-02-2011, 01:36 PM
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Big help! Now if I can find info on earlier years to compare chamber sizes on heads.
Thanks ctubutis. Those chamber sizes are enormous compared to what I'm used too.
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Old 08-02-2011, 06:20 PM
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Ford 300 carbed heads 65-86 are 76cc combustion chambers.

The 240 heads have 68cc combustion chambers.

I believe the EFI 300 heads are also 68cc. But they are a fast burn chambers with shrouded valves. And they have a tendency to crack if ever over heated.
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Old 08-02-2011, 07:13 PM
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That makes things easy on chamber size. I'm sure they varied in compression ratio's, everything else did. I'll look up available pistons to see if they made the change like that. Thanks for the info. You'd think someone would have wrote a book on these engines like everything else.
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Old 08-02-2011, 07:30 PM
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I think I know of at least 10 different pistons they used in the 300's. They had different sized and shapes of the dishes in them. And some had no dish at all but had a shorter compression height. They seemed to like to change the compression height on the pistons. Some sit down quite a bit from the deck at TDC.
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Old 08-03-2011, 08:50 PM
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I'm a fan of the Keith Black "UPS" pistons if you are looking for more compression. This piston with a stock 240 head (or the efi head) and you're gonna be in the mid 9's for compression (at least that's what I figured up a while ago when I built mine up.
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300 CI bored .030 over with a 240 head (303 CI). Clifford valves, Comp Roller Rockers, crane cam, Offy intake, true dual headers, x-pipe, pretty spicy.
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Old 08-03-2011, 10:30 PM
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What's the specs on the UPS pistons? What's the compression height and the dish size? Are they hypers or cast?

You have to be careful when selecting pistons. Some of the 300 pistons are a true flat top but the compression height is only 1.576". While others are 1.778" and just about everything in between.

When I build mine I'm just going with some domed 351W pistons. They will require a little work to the rods but they will get the job done. But I'll be shooting for a slightly higher compression then most guys.
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Old 08-04-2011, 11:16 AM
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A friend sent me a copy of the 72 Ford truck shop manuals on CD, so that and the 81's ctubis posted should give me about all I need. Thanks guy's.
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Old 08-05-2011, 03:37 PM
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Need the stock manifold tube diameter leaving cylinders and stock size exhaust pipe at manifold. Got my program calibrated pretty close to "advertised" numbers using all 72 information. Should give me a good ref point for changes. Wish I had that 240 head I scrapped after unable to give it away.
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Old 08-09-2011, 04:51 PM
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The UPS pistons are Hypers, Here's the specs on them.

Hypereutectic. 2.700' Dia. Head Recess .215' Deep W,.055 Quench Step

They are part of the silv-o-lite series, part 3118h. So far I like 'em.

Keith Black quotes the compression on these as 8.7:1, but this is with a stock head. I'm running a 240 head, plus a little decking and shaving. I figured it up as low to mid 9's on compression when it's all said and done with.

So long as you're not going to be running copious amounts of Nitrous or forced induction you really don't need more than a Hyper pistons.
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Old 08-09-2011, 06:17 PM
fordman75 fordman75 is offline
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Those specs don't look too bad. But I need domed pistons for my set up. So I'll probably just go with some forged 351W pistons.
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Old 08-31-2011, 09:30 PM
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sounds like a plan. Diamond will make whatever you need, or you should be able to run off the shelf ford 400CI pistons. Just giving you options. For the money I had at build time these were the best that I could get.
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Old 05-11-2012, 07:29 PM
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ford 240

Quote:
Originally Posted by ctubutis View Post
Here are the specs on the 4.9L 300 cid engine from the 1981 factory shop manual, does this help?

Click the image to open in full size.

Click the image to open in full size.
Hi there, you wouldn't have same info for a 240ci engine would you so I can compare rod length and combustion chambers and so forth. Regards hemihaze.
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Old 05-11-2012, 08:26 PM
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Quote:
Originally Posted by hemihaze View Post
Hi there, you wouldn't have same info for a 240ci engine would you so I can compare rod length and combustion chambers and so forth. Regards hemihaze.
Not for a 240 cid, sorry.
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Old 05-11-2012, 08:26 PM
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