What block for 540?
.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.
6 & 8 Second Club
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From: Illinois, RT 66 dragway area
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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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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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On The Tree
Joined: Dec 2003
Posts: 199
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From: Friendswood, Tx
Originally Posted by LS69TA
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.
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
Last edited by ProStreet_632; Jun 28, 2007 at 12:51 AM.
On The Tree
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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 
Thread Starter
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From: Texarkana, Tx
Originally Posted by 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
TECH Regular
Joined: Jan 2002
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From: Tulsa , Oklahoma
Originally Posted by 68maro
they are 100-150lbs heavier than a big m and a couple other issues.
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.
Last edited by JTM; Jun 29, 2007 at 09:46 PM.
On The Tree
Joined: Dec 2003
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From: Friendswood, Tx
Originally Posted by 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
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..
7 Second Club
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From: Gainesville, Florida # of drag strips runs: ?!?!?
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
Derek