Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
You could look at the casting numbers.
GM PART # 10237292
DESCRIPTION: Bare Block This Gen VI cast iron block is a strong foundation for a big-block engine project. The "short-deck" block was designed to meet the needs of a powerful and dependable 500cid engine for street or boat usage. The block's cylinder walls are "siamesed" and are bored to 4.47". The deck surfaces are reinforced to improve the head gasket sealing. Four-bolt main bearing caps are installed to reinforce cylinder barrels and add strength to the bottom end. Technical Notes: The distance from the crankshaft centerline to the deck surfaces is 9.80". It is used on 502 engines assembly, and partial engine. and can use roller tappet or stndard tappet. Casting P/N 10237300. Maximum over bore is 4.500".
besides the casting numbers is there any other way to know you have a tall deck the whole thing with a tall deck is that my friends with eagle cranks told me i need a 502 tall deck to make a 572 or 573 stroker for a customer is this true or can i use any 502 block
Our big-torque HT502 crate engine has more pull than a tugboat with a
stroker motor (See page 230 for details.)
The easiest way to put a forged stroker crankshaft in your LS engine is using
GM Performance Parts' new LSX crankshafts, which are available in four stroke
sizes up to 4.125 inches. They feature the standard-length snout and can be
used without modification on most engines. LS7 and LS9 crankshafts can be
used, but require special components and/or modifications to their snouts to
accommodate standard, wet-sump oiling systems.
Let me get this straight, you want to know if you can put a crankshaft with a longer stroke in a 502 block? What is the stroke of the crankshaft you want to put in? That chart showed the max stroke along with the casting number and deck height.
sizes up to 4.125 inches. All of those blocks will except a stroke that long.
okay my customer wants a 502 stroked to 572 with a 871 blower i cant tell you about the block because i have not purchased it yet due to the fact i have machine shop guys and a freind that wrks for eagle saying you can only get a 572 stroker if its a 502 tall deck witch makes the deck height 10.200 but if i buy a standard 502 (bare block) and a stroker assymbly to make a 572 will it work can i bore the small deck to specifications and will it wrk????
As an example: 8 cylinders times (4.600x3.14pie) bore times a 4.500 stroke=519.984 cu. in.
Bored 0.030 over =523.28 cu .in.
Bored 0.060 over =526 cu. in.
Bored 0.090 over=530 cu .in.
572 cu.in. Divided by 8 divided by (4.600x3.14) =4.95 stroke
572 cu.in. divided by 8 divided by (4.690x3.14)=4.85 stroke
Then I would say no, you cant do it, you need a stroke that block will not handle, like I said only up to 4.500 stroke. You will need a bigger bore block.
You would need this.
DESCRIPTION: Bare Block - GMPP/DRCE This GM performance parts/DRCE 2 Bare Block is a redesigned Old's DRCE. This block was designed for competition in 500ci Pro Stock Drag Racing or similar type usage. Use with cylinder heads P/N 24502585 or P/N 12480010 only. The main differences between the Old's DRCE and these semi-finished GMPP "2" blocks are the camshaft has raised to 5.750", the deck height is a 9.300" and can be reduced to approximately 9.000", the distributor hole is moved rearward on the block, and the overall weight has been reduced approximately 11 pounds. The cylinder bore centerline spacing has been increased from 4.840" to 4.900", the maximum legal bore spacing for NHRA Pro Stock competition. With the new bore spacing of 4.900" it will allow the use of big bore with short stroke piston and crank shaft combinations to enhance performance. The increase in cylinder bore spacing reduces valve shrouding and permits the use of larger valves to improve air flow. The semi finished cylinder is bored to 4.500" dia. maximum recommended bore dia is 4.700. New elliptical siamese cylinder barrels maximuze wall thickness on the major and minor thrust axes. This allows lighter weight piston and rod combinations and improve carburetor, manifold port alignment with pro stock type induction systems. This block's cam tunnel will accommodate a 2.166" cam bearing. Other improvements are No. 2 and No. 4 main bearing bulkheads are relocated .060" to distribute crankshaft loads easily. The lifter bosses has been replaced with solid bar, and the lifter holes are not drilled to allow engine builders to position them for there own valve train geometry. The head bolt holes are not drilled, so the engine builder can accomodate Pontiac S/D, Oldsmobile DRCE, or Chevrolet bolt patterns. The rear flange has a hybrid patter that accommodates Oldsmobile, Pontiac, or Chevrolet bellhousing. They use new four-bolt 8620 steel main bearing caps with splayed outer bolts to improve main bearing bulkhead durability and resist bearing bore distortion under high load. The oil pan rails have been spread .400 per side to provide room for longer stroke crankshafts. The starter motor can be mounted on either side of the GMPP/DRCE Block. Technical Notes: This high-strength iron block has brinell hardness of 210 to 230 and requires a camshaft with distributor gear behind the rear bearing. The balance of parts to complete this engine are Chevrolet Big Block (water pumps, crank, cam, balancers, flywheel, and manifolds). This block is cast with the GM Performance Parts logo on it
8x(4.700x3.14)x4.60 stroke=543 cu.in.
9.25-9.00"deck height, without fuel pump boss, siamese wall cylinder, 4.590-4.700" bore range, 4 bolt main, 22 degree main bolt degree, 4140 steel cap, 2.50" crankshaft journal diameter, dry oiling, 2 piece rear main seal, 4.60" max stroke, 255 lbs 1400+ max horsepower pro useage.
I dont see a way to do it without shorter rods or pistons.
so tall deck is 10.200 deck height correct or is 9.800 and above considered tall.... here is a website with a list of bore and stroke for all big blocks the 502 section has my attention http://www.roadsters.com/bbc/#bore is this a bore chart for all 502s my interpertaion of this chart says i can get a 502 with the right stroke and bore and i can get 573 without goin to thin on the walls.........
Sorry about last night, it was late I fell alseep.
Ok, this morning lets get started with this...
First of all, I think their calculations for determining cu.in. are off. They said, to calculate the displacement of an eight-cylinder engine: bore x bore x stroke x 6.2832. Now, for example take the 520 Engine with a 4.500" bore and a 4.00" stroke, they say it is a 509 cu.in. They came up with that with their formula 4.5x4.5x4x6.2832=508.9392,which according to their calculations is correct. My calculations are (4.5 bore x3.14)x4strokex8 cylinders=452.16 cu.in. A big difference, a 452 versus 509.
Ok, the way I see it the bore on most of those blocks are 4.6 and only allow the maximum stroke of 4.500, so that would be (4.6x3.14)x4.5x8=519.984 So, in order to get a 572 cu.in., you would need a stroke of, 572\8 cylinders x (4.6 x 3.14 bore)=4.95 but they only allow the max stroke of 4.5 so that is 4.95-4.5=0.45" too long of a stroke. So a connecting rod that much shorter or 0.45" shorter would prevent the piston from hitting a valve or extending past the top of the cylinder.
If you are unsure of the deck height, measure it. The distance from the crankshaft centerline to the deck surfaces. The distance from the crankshaft centerline to the deck surfaces is 9.80". It is used on 502 engines assembly. The "short-deck" block was designed to meet the needs of a powerful and dependable 500cid engine for street or boat usage. So they are saying the 9.80" deck is the "short-deck".
I read yet another formula, bore2 x stroke x 0.7854 x cylinders=displacement
The area formula has always been pie x radius x squared= area of a circle, so I was wrong. So it's a 4.6 bore and a max stroke of 4.5 and 8 cylinders. So, the area of the bore is (4.6 x 0.5)= radius 2.3 , radius squared = 5.29. 5.29 times pie (3.14) =16.61, 16.61 x stroke 4.5 x 8 cylinder=597.98
I say it can be done with a 9.800 deck
Bore 4.600" x stroke 4.375"2 x 8 cylinders
(4.6\2=2.3) radius 2.3, radius squared= 2.3 x2.3 = 5.29, 5.29 x 3.14=area 16.6106"
Area 16.6106" x stroke 4.375 x 8 cylinders = 581.371 cu.in.
Standard Deck Bowtie Race Block
4.3752 Stroke This crank will fit all 2pcs rear seal BBC GM engines.
454 502 BB Chevy Crank 4.375 EXTERNAL BBC Crankshaft
Cast-iron Bowtie Race BlockS
If you're looking to build a drag racing engine capable of producing
1200 horses or more, a GM Performance Parts' cast-iron Bowtie
Race Block is your starting point. It is designed for engine builders
who want to custom-machine their blocks for specific racing
applications. Toward that end, these premium castings have thick
deck surfaces, improved oiling, improved coolant flow and splayed
4-bolt steel bearing caps. Everything is secured with premium
fasteners. The combination of a GM Performance Parts cast-iron
Bowtie Race Block and your unique engine building skills will put
you down the track ahead of the competition.
See chart on page 231 for complete specifications.
Cast-iron Bowtie Race Block Technical Notes:
timing cover (aftermarket belt drive timing covers may require
should be checked
Tall Deck Bowtie Race Block
88890534 HT502-Truck Replacement Engine 502 cu in 4.00 stroke 4.47 forged aluminum pistons557 338 512 100
12568782 ZZ502/502 Partial Engine 502 cu in 402 N/A N/A 101,103,105,107
12568778 502 HO-with Iron Heads and Roller Cam 502 cu in 602 450 550 102
19201332 ZZ502 Deluxe-(Deluxe/Assembled) with Aluminum Heads 502 cu in 611 502 567 104
12371171 ZZ502 Deluxe Kit, with Aluminum Heads 502 cu in 602 502 567 105
12496963 ZZ502 Base Engine, with Aluminum Heads 502 cu in 504 502 567 106
12371204 ZZ502 Base Kit, with Aluminum Heads 502 cu in 532 502 567 107
12499121 Ram Jet 502-PFI with Aluminum Heads 502 cu in 608 502 565 108
19201333 ZZ572/620 Deluxe 572 cu in 580 620 650 110
12498792 ZZ572/620 Base 572 cu in 514 620 650 111
19201334 ZZ572/720R Deluxe 572 cu in 720 685 112
12498826 ZZ572/720R Base 572 cu in 720 685 113
4.5 bore= 15.896 area x 4.375 stroke x 8 cyl= 556.36875 cu.in.
This Gen VI cast iron block is a strong foundation for a big-block engine project. The "short-deck" block was designed to meet the needs of a powerful and dependable 500cid engine for street or boat usage. The block's cylinder walls are "siamesed" and are bored to 4.47". The deck surfaces are reinforced to improve the head gasket sealing. Four-bolt main bearing caps are installed to reinforce cylinder barrels and add strength to the bottom end. Technical Notes: The distance from the crankshaft centerline to the deck surfaces is 9.80". It is used on 502 engines assembly, and partial engine. and can use roller tappet or stndard tappet. Casting P/N 10237300. Maximum over bore is 4.500".
BB Chevrolet 502 Bare Block, Gen VI
The 10237300 has a maximum bore of 4.500"
Area is 15.89625 x 4.125 x 8 =524
okay so wat can i make with the block i have can you tell me that?10237300 or wats the biggest i can go with "my block" need to know asap 496 525 540 560.....ect........
Heres a crank with a 4.250 stroke.
wat will that stroke give me ......or can it give me.... i dont know how to calculate all that stuff thats why i ask you? when i say 496 520 540 572 573 .......
Ok, a max bore of 4.500', stroke 4.250 would be area 540 cu.in.
Here you go, 454 502 572 BB Chevy Crank BBC STROKER Crankshaft RP$4340 FORGED CRANK YOU CHOOSE YOUR STROKE
4.000, 4.25, 4.375, 4.500" Stroker Crank for 2pc rear seal cranks
So wat ur telling is my block with that bore and that stroke crank in it i will have a 572 exactly.....
now that we know my block will work and that bore and stroke will work .....im gonna run a 871 blower on it due to high compression with those pistons wat heads(oval rect.) and pistons should i use to lower my compression between 7.5 8.7 max this was the second part of my headache. thank you
can you recomend any paticular head or pistons......that will give us our 7.5 8.7 max comratio. for my motor.
There are so many different manufacturers and shapes and sizes, that would take me hours. Do some google seaches for speed shops or performance parts and join them and get their catalogs. I am sure there are going to be several to your liking.
Click on the left where it says pistons.