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How big can you go with a low deck? After market block and all the good stuff?

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572ci

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Wow! I would have guessed 540". At 572ci, that is still a 4.5" stroke right? Seems that would take alot of clearancing to work. I still think 4.5" bore is the most using an aftermarket block.

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How big can you go with a low deck? After market block and all the good stuff?

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572ci

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Wow! I would have guessed 540". At 572ci, that is still a 4.5" stroke right? Seems that would take alot of clearancing to work. I still think 4.5" bore is the most using an aftermarket block.

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You are correct 4.5 bore is the biggest you can go(low deck motor)

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Any issues at that bore size with head gasket sealing? Maybe with 15 psi from a blower?

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1.Block is lighter
2. cylinders are shorter (stronger)
3. Bigger standard bore
4. shorter push rods (Less weight and flex)
5. less main bearing surface area
6. shorter pistons and rods ( lighter reciprocating weight)
Off the top of my head these are a few things a low block has going for it.

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My 512 is an RB...Already had the intake and dizzy. It is undercammed and could use better heads. But at this time I am done spending money on it..

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How big can you go with a low deck? After market block and all the good stuff?

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572ci

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Wow! I would have guessed 540". At 572ci, that is still a 4.5" stroke right? Seems that would take alot of clearancing to work. I still think 4.5" bore is the most using an aftermarket block.

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You are correct 4.5 bore is the biggest you can go(low deck motor)

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Any issues at that bore size with head gasket sealing? Maybe with 15 psi from a blower?

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How big can you go with a low deck? After market block and all the good stuff?

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572ci

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Wow! I would have guessed 540". At 572ci, that is still a 4.5" stroke right? Seems that would take alot of clearancing to work. I still think 4.5" bore is the most using an aftermarket block.

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You are correct 4.5 bore is the biggest you can go(low deck motor)

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Any issues at that bore size with head gasket sealing? Maybe with 15 psi from a blower?

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Don,t know about a blower,but i can say that i have never blown a head gasket spraying 400hp of NOS and thats on one kit...

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You one crazy S.O.B.

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Those are all great points. Who on here prefer the low deck over an RB?

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I have not seen a low deck split the main webs like the stock RB blocks do If your going to go to a good aftermarket block then the RB is as good as or better than the stock 400 blocks are with all the aftermarket stuff like main caps, girdles and so on. I built my first low deck 512 stroker back in 2002 or 2003 I think, It was a bunch of parts that I threw together without much thought It is a 1972 400 block that ended up needing four sleeves and the deck welded up a 4.250 Ohio Crankshaft CO 8 bolt Hemi stroker crank cut down on the mains for the low deck and cut down to 2.200 on the rods, I used a set of CAT 6.800 long BB chevy style rods, a custom ground(not for that motor ) Comp Cams solid roller cam and set of Ross custom 22 CC dished pistons with 9.25 to 1 comp. ratio, ported big valve 906 heads and a Eddy low deck six pak intake with stock type 1970 440 carbs. I was hoping to make bewtween 550 HP and 575 HP on pump gas, it made 612 HP at 5600 RPM and 644 Ft. Lbs at 4500 RPM on CA pump gas I was (and still am)thrilled with the results. I have since hopped that motor up some more by changing the crank to a Chinese imported 4.300 stroke carnk(to raise the pistons up to zero deck to increase the compression 9.25 to 1 to 10.29 to 1 )and a set of Eddy RPM heads CNC ported by Jeff at MCH along with a set of Harland Sharp 1.6 roller rockers Those three changes raised the HP to 718 at 5800 RPM and 745 Ft Lbs on Oregon pump gas I am building another low deck stroker now, thick main web 400 block(thanks AndyF ) with ductile iron main caps and main studs, the original Ohoi Crankshaft CO. 4.25 stroke crank, a set of RPM brand 6.700 long BB Chevy style rods and a set of custom lightweight high compression(12.8 to 1) Diamond pistons with a custom ground Ultradyne solid roller. I'm not sure which heads I'm going to use yet, either a set of stock 440-1 with Jesel rockers or the Eddy RPM heads with the Harland Sharp rockers that use to be on the 518 motor lots of choices out there, have fun deciding

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Don't forget you can get a low deck block from Keith Black as well. That is where mine came from. As for the bore they can obviously go more than 4.500, mine is at 4.510 now but have heard some as big as 4.560 or bigger. As for the stroke I think you can squeeze 4.5" in there. I would say with aftermarket stuff which is the only way to go if you are planning on making power 555,565 or 572 are all very doable. However from my experience those 540's sure seem to work well too.

Most of the benefits of a low deck engine have been listed already. The real limit is cubes IMO they can only go so big before you just cant stuff anymore in there. Think outside the bun and you might be surprised what can be done.

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Chris..

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so nobody likes the rb 512 or bigger is it cause the block(stock)webbing

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AL,Got me thinking so i pulled out my piston sheets and it says Bore Size 4.506....for are low deck motor.

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Is this a aluminum block or a stock block

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AL,Got me thinking so i pulled out my piston sheets and it says Bore Size 4.506....for are low deck motor.

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Is this a aluminum block or a stock block

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