427 or 428 - How do I tell?

[Excaliber]

DanEC, 428 is fine, if you like smallish valves and asthma intake....

[undy]

As Rick hinted at, there were a few irrigation/industrial 427s made that had the 2 bolt mains w/press-in freeze plugs. If you do a search over of FordFE.com you'll find some pics of one. They are v-e-r-y rare though...

There's a ton of punch out 390s out there that are being marketed as "428" blocks too. Some of them have been cross-bolted too.

Ernie, some people prefer a long stoke and a smaller bore Ever heard of notching the tops of the cylinders for vlave clearance?

[CobraEd]

I heard that the bore/stroke of a "428" was closer to 427 than a "427". Not sure if that is true either, but if the guy sold you a "428" and told you it was a "427", he was sort of telling the truth.


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[Rawkkrawler]

As always, I'm very thankful for the support here on CC!

I have been very satisfied with the performance of the motor so far. It does provides plenty of power for the occasional 1/8 mile and Auto X runs, however, when I do decide to make some changes, I'd like to be sure I know more about the foundation.

I plan to swap out the Offy 2X4 intake for a single four and get rid of the 2 Edlebrocks all together. I haven't ever been satisfied with the setup. My dyno curve shows both torque and horsepower coming in too high in the RPM range in my opinion. I'd like to see a more "street" friendly curve if possible.

Also, if the 428 provides more low end torque, I'd like to take advantage of it. My last chasis dyno shows 356 ft/lbs, seemed low.

Again, thanks for all of the support!

Mike

[Woodz428]

[quote=CobraEd;1091637]I heard that the bore/stroke of a "428" was closer to 427 than a "427". Not sure if that is true either, but if the guy sold you a "428" and told you it was a "427", he was sort of telling the truth. [quote]


I think you are correct, it is a miniscule difference...but I would say that's stretching the truth a tad bit much. Ignorance is no excuse either

[Woodz428]

While any FE block can be outfitted with crossbolts, this block doesn't possess them. I think the 428 is a great engine for most applications, but it is the fraud that I find offensive. The reason 427 is claimed is for the extra $$ they can bring. So, again that constitutes fraud and I'd probably yank the block and set on his desk and ask for a return of some funds or a 427 shortblock. If they refuse I'd be making their life He!!. Stupidity is hard enough to deal with but fraud is unexceptable. His claim that he even swapped the block is open for suspicion under the current status. It sounds like he wanted to insure that he got how much $$ he wanted, and relied on the buyer to be uninformed. Payback is he!!.

[DanEC]

Originally Posted by Excaliber

DanEC, 428 is fine, if you like smallish valves and asthma intake....

I have KC ported/polished 390 Hi-Po heads with 427 low riser valves and a low riser 427 dual quad intake and 2-600 cfm Holleys to deal with that on my street roadster replica.