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SFI Flexplates


 

Manufactured in the USA on state-of-the-art CNC equipment, ATI's Flexplates are created from SFI-spec steel and are SFI 29.1 Certified and are double MIG/TIG welded for additional strength and lasting precision pass after pass. Each ATI flexplate is manufactured and toleranced from OEM drawings to ensure a precise fit and location. Each plate is quality inspected to exceed the flatness and run-out tolerances of the OEM units and is precision balanced on Hines digital equipment with a resolution of 1/10 oz-in.

Starters for ATI Flexplates
Crank Adapters for Extra Thick Midplates

Bolt Pattern & Tooth Count

Application
Tooth Count
Bolt Circle
GM
153
10.750"
GM
168
11.500"
FORD
157
10.500"
FORD
164
11.4375"

Chevy Late Model 305 / 350
Late model bolt-on crankshaft flange - '86 and up one-piece rear seal [12]
Engine Group Teeth Balance Part # Price  
305 / 350 153 INT 915533 $239.00

Chevy Small Block V8 [12]
Engine Group Teeth Balance Part # Price  
283 / 302 / 327 / 350
Early 2 Piece Seal
153 INT 915539 $229.00
168
INT 915541 $199.00
10 DP [10] 139 INT 915545 $261.00
400 168 EXT 915561 $209.00

Chevy Big Block V8
[12]
Engine Group Teeth Balance Part # Price  
'70 - '90 454
454 / 502 Mark IV
168 INT 915541 $199.00
168
EXT 915551 $223.00
'91 & up Gen V 454 [2] 168 INT 915541 $199.00
'91 & up [3] 572, Gen V - 454 HO / 502 HO 168 INT 915541 $199.00
396 / 427 168 INT 915541 $199.00
'70 & Up 396 - 502 10 DP [10] 139 INT 915545 $261.00


Chevy LS & LT Applications
Engine Group Teeth Int. Balance Price  
LS1/2/6/7 & L89 WITH 6 BOLT CRANK (Race only) [12] 168 $339.00
LT1 / LT4 / ZL1 Z-BODY CTS-V W/LSA - LSX 8-Bolt Crank [12] 168 915737 [7, 11] $349.00


Oldsmobile and Pontiac Applications
Application Engine Group Teeth Balance Part # Price  
Oldsmobile [12] '64 - '67 V8
300 / 400 / 425
166 INT 915562 $299
166
EXT 915563 $309
All V8 including Diesel
166 INT 915564 $233
166
EXT 915565 [4] $261
Pontiac V8 [13] 400 / 455 166 INT 915567 [14] $240



Chrysler V8 - with ATI Adapters to GM Powerglide, TH350 & TH400 Transmissions
Application Engine Group Teeth Balance Part # Price  
6 Bolt Crank All wedges 130 INT 915650X [9] $230.00
8 Bolt Crank HEMI 130 INT 915660X [9] $219.00


Dodge Viper - 8-Bolt crank to GM
 Application
Engine Group
Teeth
Part #
Price Purchase
Viper V10 ('05–'17) 8 Bolt Crank HEMI 143 915666 $275.00



Chrysler V8 SFI  - 8-Bolt crank new style HEMI standard replacement
Application Engine Group Part # Price  
'05 - '08 300C, Charger & Magnum 5.7L & 6.1L $229.00
'05 - '07 Jeep Grand Cherokee [8] 3.7L & 6.1L
-- NOT 5.7L --
$229.00
HEMI - Gen III to 904/727 Trans, Includes 10.9 Spec Crank Bolts 5.7L , 6.1L, 6.5L $149.00
  1. Externally balanced flexplates must be on the crank for balancing or match balanced to the unit that was originally balanced with the crank.
  2. Cast crank only - 41.95 oz. in.
  3. Forged crank only - 42.54 oz. in.
  4. 25.0 oz in
  5. No weight. Imbalance is accomplished by lightening one side of the flexplate.
  6. Replacement parts require crank adapter for proper use. ATI Chrysler adapter flexplates require the use of 10 3/4” bolt circle only with GM converters.
  7. LS flexplates sold only as a kit. Includes flexplate, crank adapter and bolts. Requires a custom aftermarket converter. Must have an engine mounted transmission.
  8. Does not fit 5.7L Jeep Grand Cherokee. OEM converter bolt holes require longer bolts - included. Use ATI #951037-8 flexplate to crank.
  9. Replacement parts: Be sure to specify the date of original order. Parts shipped prior to January 2007 have different dimensions and part numbers (non-X numbers). Flexplate to crank bolts: for 6-bolt crank, use #951034-6; for 8-boltcrank, use #951034-8.
  10. Special starter required. Order pt.#915546.
  11. For use with 8-bolt cranks
  12. Uses ATI #951479-6 flexplate to crank bolts
  13. Uses ARP bolt #200-2904 Flexplate to crank
  14. Flexplate has 2.75” center hole. For cranks with a 2.5” register, call ATI for an adapter
Ford Flexpate Kits
Ford Flexplate kits include flexplate, CNC-machined crank piloted spacer and crank bolts ATI flexplates fit aftermarket converters only.
 
915722 - Flexplate, spacer & crank bolts


APPLICATION
FLEXPLATE KIT
INCLUDES FLEXPLATE, CRANK PILOTED SPACER AND CRANK BOLTS
FLEXPLATE ONLY
ENGINE
TRANS
TEETH
INT. BALANCE
PRICE
INT. BALANCE
PRICE
EXT. BALANCE
PRICE
429 / 460
C6
E4OD
164
915720
$339.00
915700
$239.00
915701 [1]
$261.00
FE
332 / 428
C6
E4OD
184
915722
$339.00
915702
$240.00
--
--
289 / 302
351 / 400
C6
E4OD
164
915724
$289.00
915704
$239.00
915705
$240.00
289 / 302
351 / 400
C4
AOD
164
915727
$289.00
915707
$239.00
915708 [3]
$239.00
289 / 302
C4
157
915730
$339.00
915710
$230.00
915711 [3]
915712 [4]
$230.00
$229.00
4.6-5.4L
Mod Motor
GM
164
915735 [6]
$289.00
915719
$229.00
--
--
COYOTE 5.0L 8-BOLT
GM
164
915738 [6]
$339.00
915719
$229.00
--
--

  1. 24 oz. in. - 460 truck only with D9TP-6375-AA or E7TP-6375-AA OEM flexplates.
  2. 28.8 oz. in. OEM flexplate. For reference, the OEM weight is 5 1/8” x 5/8” x 5/16” thick.
  3. 28.2 oz. in. All 289-351C-351W- 400 and 302 through 1980. OEM flexplate is 4 1/4” x 3/4” x 3/8” thick.
  4. 50.0 oz. in. ‘81 & up 5.0 L only. OEM flexplate weight is 4 1/4”x 7/8” x 7/16” thick.
  5. Flexplate ONLY part # - not the full kit for noted External Balance flexplates
  6. These kits are for Ford motors with GM Transmissions only
  ATI Ford Flexplates with 164 teeth have an 11-7/16” bolt circle, and flexplates with 157 teeth have a 10-1/2” bolt circle for Ford converters. Both have factory installed 10-3/4” & 11-1/2” bolt circles for GM converters but only the 10-3/4” bolt circle is usable for the 157 tooth flexplates due to ring gear interference. The 184 tooth FE flexplates are 11-7/16” Ford bolt circle only! ATI Ford Flexplates are flat. They will accommodate only those converters where the drive pad is ABOVE the converter body.

 



Superplate® High HP Flexplates





Now available: 166 tooth flexplates to fit all popular size SFI 6.3 spec cans!
  ATI has developed the Superplate line of Flexplates to keep up with rampant HP gains made each year. Superplates are manufactured from a material with a 90,000 lb. tensile and 80,000 lb. yield strength to withstand thousands of cycles. Superplates are laser machined to avoid heat and stress that stamping inflicts on the part. The crank bolt holes and center hole are bored to exacting tolerances using ATI’s in-house CNC machines. The Superplate uses the correct “grip length” crank bolts as dowels to prevent the plate from moving under high torque conditions.

Why is a flexplate necessary? While manufacturing strives for precision, actually achieving it can be very difficult. Therefore, believing that a crankshaft will be 100% in the center of the main line of the engine and thinking that everything will line up perfectly from the damper to the input shaft of the transmission is a fallacy. Because of the imperfect process, the flexplate needs to be flexible in order to make up for the “allowable” tolerances of the various part manufacturers.

ATI’s flexplate design is derived from a vast array of auto manufacturers, including big names like Lamborghini, Mercedes Benz, Bugatti, as well as 30 years of our own experience. A billet or thicker flexplate does not flex and therefore cannot absorb the “allowable tolerances” and that, in turn, can cause damage.

ATI Superplates are neutral balanced for use in internally balanced engines and exceed SFI 29.1 & 29.2 ratings.

Starters for ATI Flexplates

Crank Adapters for Extra Thick Midplates


General Motors - For internally balanced engines. Superplates require specific bolts for each application - consult your ATI technician for assistance.
Bolt Pattern Teeth Bolt Size Part # Price  
Chevy SB - High HP - standard holes 168 Standard 915544 $239
Chevy 6 bolt - 7/16” bolts (standard replacement)
2-piece rear seal crank flange
168 7/16" 915554 $309
Chevy 6 bolt - 7/16” bolts (needs special starter)*
2-piece rear seal crank flange
139
10DP
7/16" 915555* $309
Chevy 6 bolt for 1/2” bolts
2-piece rear seal crank flange
168 1/2" 915548 $299
Chevy 6 bolt for 1/2” bolts -
2-piece rear seal crank flange
139
10DP
1/2" 915556 $309
Chevy - Chrysler 8 bolt for 1/2” bolts
(uses standard Chevy starter)
168 1/2" 915547 $309
* needs special starter

Chrysler V8 - For internally balanced engines
Application Teeth Bolt Size Balance Part # Price  
6 Bolt Crank 130 1/2" INT 915549 $309
8 Bolt Crank (Chevy starter) [1] 168 1/2" INT 915547 $309

[1] Fits Chevy motors with aftermarket crank with 8-bolt Chrysler flange


Flexplate Hardware Kits

Flexplate Bolts
Part Number
Price
FORD 289-302-351 ALL 400-C6 / 400 164 TEETH
950142
$31.00
FORD 289-302HO-351 ALL 400-C6 / 400 164 & 157 TEETH
950143
$37.73
FORD COYOTE - FLEX TO CRANK - M10 X 1.00 X 35MM, CLASS 10.9 HHCS - (Pack of 8)
951378-8
$47.31
FORD MOD AND LATE HEMI
950144
$18.95
LATE MODEL HEMI 8 BOLT - 10MM X 1.00 X 20MM, CLASS 10.9 - (Pack of 8)
951372-8
$11.00

Flexplate Hardware - High HP use with ATI flexplate and crank adapter
Part Number
Price
MOPAR (Except HEMI) & FORD SB 7/16 - 20 X 1 1/4”, .700 GRIP, 12 PT (Pack of 6)
951034-6
$66.39
MOPAR HEMI 1/2 - 20 X 1-1/4”, .700 GRIP, 12 PT (Pack of 8)
951035-8
$92.93
FORD 429-460 7/16 - 20 X 1”, .200 GRIP, 12 PT (Pack of 6)
951036-6
$27.32
FLEXPPLATE TO CRANK 1/2 - 20 x 1-1/4”, .225 HEAD,GRADE 8 (Pack of 8)
951435-8
$21.37

Crankshaft to Flexplate Spacers for Lock-Up
Part Number
Price
CHEVY 6-BOLT - SPRING STEEL
915648
$19.95
CHRYSLER 8-BOLT - SPRING STEEL
915649
$19.95



Flexplate Hardware - High HP use without crank adapter
Part Number
Price
FLEXPLATE TO CRANK 1/2 - 20 x 13/16” - Pack of 6
951058-6
$57.60
FLEXPLATE TO CRANK 1/2 - 20 x 1” - ,450 GRIP - 12 PT EXTREME DUTY - Pack of 6
951059-6
$48.44
FLEXPLATE TO CRANK 1/2 - 20 x 1” - ,450 GRIP - 12 PT EXTREME DUTY - Pack of 8
951059-8
$64.58
HEMI OR 8-BOLT CRANKS WITH HD MACHINED ON-SIZE FLEXPLATES
1/2 - 20 x 13/16” (modified to 0.722" length) - Pack of 8
951058M-8
$106.17
CHEVY FLEXPLATE TO CRANK FOR USE WITH CHEVY / OLDSMOBILE CRANKS
7/16 - 20 x 11/16” - Pack of 6
951479-6
$22.51
 
     
 
 
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