496 vs 511 vs 525 - Page 4 - Chevelle Tech
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post #46 of 57 (permalink) Old Dec 25th, 18, 5:01 AM
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Re: 496 vs 511 vs 525

Will a oem short deck 454 block take a 4.500”stroke arm?
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post #47 of 57 (permalink) Old Dec 25th, 18, 8:20 AM
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Re: 496 vs 511 vs 525

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Originally Posted by Chevelle 1969 View Post
Will a oem short deck 454 block take a 4.500”stroke arm?
Not with a lot of money into it. Some experienced engine builders can chime in but I think you run into the oil galley when you grind the bottom of the block for rod clearance. I think they grind is and end having to put a tube in oil galley etc. On a 496 4.25 stroke I think you still need to do some grinding depending on the rods a 4.5 stroke inch can only make it worse. I think the GM Bowtie Block can make it but would need to check. The Dart Blocks move it up to cam area and thus giving the block lots of clearance down below.
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post #48 of 57 (permalink) Old Dec 25th, 18, 8:32 AM
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Re: 496 vs 511 vs 525

A 4.5" crank WILL fit into a short deck block--I've done it (Mark IV Bowtie block). The clearance at the pan rails wasn't an issue, but it took quite a bit of grinding to make room at the cam tunnel.

To the OP; as I said when I replied to your PM's, I wouldn't advise the 4.5" crank. For what you're trying to accomplish, a 496 or 505 will easily meet your goals.

Save yourself some time, $ and headache. You don't need a Howitzer to hunt squirrels.
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post #49 of 57 (permalink) Old May 22nd, 19, 10:33 PM
 
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Do the 511 I’ve done one it’s not any trouble at all I used a hamburger 8qt pan and a vacuum pump from an f-body for oil control
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post #50 of 57 (permalink) Old May 25th, 19, 1:33 AM
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Re: 496 vs 511 vs 525

572

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post #51 of 57 (permalink) Old May 25th, 19, 2:36 AM
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Re: 496 vs 511 vs 525

Kinda hard with a stock 4.250 vs 4.500 BBC block isn't it?

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post #52 of 57 (permalink) Old May 25th, 19, 3:47 PM
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Wink Re: 496 vs 511 vs 525

Building my next motor
w/a 4.600 block & 3.76
stroke, 290 oval AFRs,
10.5 cr, and EFI.

"It's just a 396 with bigger cam & pistons."
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post #53 of 57 (permalink) Old May 25th, 19, 5:34 PM
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Re: 496 vs 511 vs 525

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Originally Posted by Calculated Risk View Post
Given the choices of parts, and type of usage, I would go with the 4.375 stroke at most. That 2.56 gear. heavy car, and i'm guessing very tight converter will place alot of load at low rpm, i'm not sure the 87 octane is going to be happy unless you have some conservative timing.

Personally I prefer adding stroke vs bore to a combo when feasible. And it's not about adding cubic inch or "torque", i like how the added stroke effects camshaft dynamics.

You can work with the 2" header, look at what the FAST guys do with cast manifolds and stock size exhaust.

Nothing is ever "ideal", there are always compromises in a combo. According to some posts in here all my combos are doomed, but they just keep on running, lol
Fwiw, I always feel doomed with any of my combos. That said, I've been "fairly" lucky so far.

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post #54 of 57 (permalink) Old May 25th, 19, 6:19 PM
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Re: 496 vs 511 vs 525

Quote:
Originally Posted by Tarheel Chevelle View Post
Building my next motor
w/a 4.600 block & 3.76
stroke, 290 oval AFRs,
10.5 cr, and EFI.

"It's just a 396 with bigger cam & pistons."

I have one in the works. It's a retired BowTie block at 4.635", Scat 3.766 fully counterweighted crank, Molnar rods and custom pistons. Block already has bushed lifter bores for .903's. This is for my '81 Corvette and will have a TKO600 behind it. Progress has been slow but constant.
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post #55 of 57 (permalink) Old May 25th, 19, 9:14 PM
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Re: 496 vs 511 vs 525

I love the look of those year Vettes.

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post #56 of 57 (permalink) Old May 26th, 19, 9:22 AM
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Re: 496 vs 511 vs 525

Quote:
Originally Posted by Tarheel Chevelle View Post
Building my next motor
w/a 4.600 block & 3.76
stroke, 290 oval AFRs,
10.5 cr, and EFI.

"It's just a 396 with bigger cam & pistons."
My motor guy has one of these. It's just a big 427 he says. No efi but just a single big custom carb and it did dyno at 1270 horsepower at like 9000 rpm. It was a pro stock motor from years ago. Not great toque motors but great horsepower and rpm motors
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post #57 of 57 (permalink) Old May 26th, 19, 10:27 AM
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Re: 496 vs 511 vs 525

^ The whole idea for me is to have a big block with less torque off the line than a 540/565 that will wind up like a smallblock. Experienced racers all seem to agree that the best engine is one that gets back into it's top power making RPM band after the shift and these short stroke/big bore engines are just the ticket. I ended up with a pair of L88 replacement heads (3401 castings) that I'm having fitted for 11/32" valve stems and ported. If I can get 350cfm or so out of them, that should fit the bill nicely for my project. This isn't a race car, just something to irritate the rich boys with their brand new 700hp store-bought plastic cars.

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