CID	Bore	Stroke	Flat/dished		Rod length		Ring part #	Piston Part#	Piston Price
	434-440	4.155-4.185	4.0"	Flat 4.3cc		6.800 BBC		2M5529	KB937	$499.00
	461-468	4.155-4.185	4.250"	Dish 10.6		6.800 BBC		2M5529	KB938	$499.00
	461-468	4.155-4.185	4.250"	Flat 4.3cc		6.800 BBC		2M5529	KB941	$499.00
	488-501	4.155-4.210	4.500"	Flat 4.3cc		6.700 BBC		2M5529	KB942	$499.00
	488-501	4.155-4.210	4.500"	Dish 16.8		6.700 BBC		2M5529	KB943	$499.00
	461-474	4.155-4.210	4.250"	Dish 30cc		6.635 BBC		2M5529	KB981	$499.00
	505-538 *	4.350 – 4.360	4.250 or 4.500	Flat 17.3 cc		6.700 or 6.800		2M5528	KB631	$559.00

Spotts Performance offers FORGED stroker pistons for both the cast and forged aftermarket crankshafts for Pontiacs. All pistons are sold as a set of 8. You can now increase both 400 and 455 blocks from 434 to 501 CID’s! Aftermarket blocks from 505 to 538 without custom pistons

The KB981 was developed by Spotts Performance for use in “stealth” engines so pump gas can be used with 72 cc’ iron heads. We have built many stock appearing 4bbl. Tripower and even RAIV’s as pump gas 461 plus engines. Stock looking engines, street, strip or race engines can now be increased from 461 to 501 CID without ordering expensive custom made units. Pistons are quality forged units with .990 BBC style pins included and pin fitted. Pistons allow use with factory heads, Edelbrock, KRE and others. Note – certain larger intake valves on ported aftermarket heads may not work (except for KRE high ports!). We also offer complete rotating assemblies, complete short blocks, or complete crate engines! 

 * NOW AVAILABLE – large bore aftermarket block pistons for KRE MR1 and IAII aftermarket blocks! Another piston designed by Spotts and KB to allow both 4.250 and 4.500 stroke cranks to used in the aftermarket blocks. The compression height is 1.292 and with 4.250 stroke and 6.800 inch rods, the stack height is 10.217. The piston will be in the hole and block will be needed to be decked for proper compression ratio with heads used. When the KB631 piston is used with a 4.500” stroke and the 6.700 long rod, the stack height is 10.242 – so on a 10.240 deck height block, the piston will be out of the hole .002    

Engine	Bore	Compr.	Flat/dished	Type	Rings	Part#	Price
389	60	9.8	Flat 4 v r	FHR	2M644	KB9946 std	$399.00
400	STD 30-40-60	9.8	Flat 4 v r	FHR	2M644	KB9946	$399.00
400	30 40 60	9.5	Dish 14cc	Forged	2M5529	KB891	$449.00
400	30 40 60	10.5	Flat 6cc	Forged	2M5529	KB890	$426.00
428	30-40-60	10.5 w/72	Dish 10cc	Forged	2M5529	KB892	$449.00
455	30 40 60	9.3 w/100cc	Flat 6cc	Forged	2M5529	KB888	$426.00
455	30 40 60	10.6 w/72	Dish 15cc	Forged	2M5529	KB889	$449.00

Notes. FHR is forged head relief – all other pistons completely Forged. All pistons accept full float or press fit rods. All above pistons are for stock spec rods - length, big end, pin bore and stock strokes. Stroker pistons listed separately. Will not accept factory ring packs (except FHR)– must order rings listed. All pistons accept stock or Edelbrock heads.

Engine	Bore	Compr.	Flat/dished	Type	Rings	Part#	Price
389	30-40-60	10.5	Flat 3.5cc	Hypereutectic	2M639	KB370	$319.00
389	.060 4.120 bore	9.5	Dish 17cc	Hypereutectic	2M644	KB346-std	$339.00
400	Std 30 40 60	9.5	Dish 17cc	Hypereutectic	2M644	KB346	$339.00
400	30 40 60	10.5	Flat 6cc	Hypereutectic	2M644	KB133	$319.00
421	60-4.150	11.3	Flat 6cc	Hypereutectic	2M644	KB304-30	$319.00
428	30 40 60	11.3	Flat 6cc	Hypereutectic	2M644	KB304	$319.00
455	30 40 60	9.5 w/72cc heads	Dish 30 cc’s	Hypereutectic	2M643	KB371	$339.00
455	30 40 60	9.5 w/96cc heads	Flat 6 cc	Hypereutectic	2M643	KB222	$319.00
455	30 40 60	9.0 w/105cc heads	Dome 0 cc	Hypereutectic	2M643	KB347	$319.00

Notes: hypereutectic pistons require the upper rings to be gapped wider – pistons will work with press fit or bushed rods – pistons include pins and locks. All above pistons are for stock spec rods - length, big end, pin bore and stock strokes. The dished 389 pistons are 400 pistons and only available in 1 size (4.120 bore)

Part #FP1	Ross pistons flat tops	$639.00
Part #FP2	Ross pistons dish or dome top	$659.00

Custom Ross pistons available in most bore sizes, ring grove sizes and pin heights. Flat dome or dished in many configurations. Custom dish or dome available for additional fee. Pins are extra cost - we carry both Ross and Ferrea pins listed below.

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Piston Pins - full float

Part#	Size	Weight	Price ea.
P70014	.990 X 3.000	133 G	$15.00
P70028	.990 X 2.930	138 g	$15.00 (most popular - used with Ross pistons)
P70060	.990 X 2.500	123 g	$15.00
P980	Ross .980 X 2.930	146 g	$86.00 (used with Ross pistons and stock Pontiac rod sizes)

Other sizes available. Call or EMAIL for prices.

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