LS69TA

iTrader: (30)

I was looking at the stroker kits, and a 540 isn't much more than the 496 kit. How big can you go on a stock gen IV block?

35th SS

iTrader: (2)

unless its a bowtie block or a twin/siamese bore I wouldnt go pass 500cid.just my 0.02 cent for ya.good luck

ulakovic22

iTrader: (12)

.030 over bore is safe, so you need to get CID by stroking it. Short deck block 4.25 is max and tall deck truck block you can go 4.375 or maybe 4.5 so you can find a calculator and do the math. Need to use at least a 6.385 rod and try to keep your compression height around 1.2 so you can use an off the shelf piston.

Beaflag VonRathburg

iTrader: (176)

You might just want to step up to a dart big M block. They sell relatively cheaply on ebay and you can get them with rotating assemblies.

mrdragster1970

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505" is the bigest, on a 9.8 I've seen that lastest more than a few pass'. I don't trust going more than .100-.110 over on a stock block. I've gone .105 several times, no problems.

Big bore block is well worth it, if you can afford it. A short deck can go 582" safely with a big bore block. I know, I've done it.

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68maro

just do a gen 6 502 block. you can get them under a grand and go to at least 582"

TXTA

iTrader: (3)

so the dart big M block can be made, SAFELY, into a 540ci motor?

LS69TA

iTrader: (30)

Yea, I believe so. That's a tall deck right? I'm pretty sure it will take a 4.5" bore and 4.5" stroke like the tall deck Merlins I've been looking at.

68maro

do not do a merlin block

ProStreet_632

If u r looking for a good rotating assembly, I have a set up for a 555 with very few passes on it.

Lunati Pro Billet 4.25 crank
JE gas ported custom pistons
Manley Pro Mod rods

All good stuff, get a Bowtie or a Dart Block and u will be in good shape

Just throwing it out there for u

LS69TA

iTrader: (30)

How much you looking to get for it?

ProStreet_632

Let me see and I will pm u tommorow

Andrew

LS69TA

iTrader: (30)

What is wrong with the Merlin blocks?

stressfulcar

I have a dart bigM in my car,mine is 572cu.in,4.5bore/4.5stroke.I ordered my block and rotating assy w/bearings new off e-bay for 3,745 shipped to my door.I know they had 632cu.in kits available useing the same block so 540 is not a problem

LS69TA

iTrader: (30)

How is that 572 working out for you? I saw those shortblocks on Ebay earlier today.

68maro

they are 100-150lbs heavier than a big m and a couple other issues.

JTM

A new merlin III block is not 100-150lbs heavier than a dart big m, put your crack pipe down.

Dart Big M= 240 lbs
Merlin III=260 lbs

Now Merlin does have a block that has a 11.625 deck height and it only weighs 297 lbs, still a ridiculous claim of 100-150lbs heavier even for that block. What issues do the current merlin blocks have? I just had to say something, because that bogus claim could sway someones decision and spread even more wrong information.

ProStreet_632

A 632 has to use a tall deck block, which is a 10.2 deck height due to the 4.75 stroke on the crank..

stressfulcar

I forgot to mention....Mine is a 10.2 deck block.... And it is working out pretty good so far

Villain281H

iTrader: (5)

I've also heard from my engine builder that World Products is having issues with their blocks not holding up (cracking and such) in both mega HP and 500-800 HP combinations.

Derek