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Ross Pistons 3SX Custom for 6G74

3SX Custom Ross Pistons for 6G74 3.5l Block

Turbo & Non-Turbo

 


For 3.5L NON-Turbo Conversions in 3000GT / Stealth

Go BIG or go home! These are the pistons used in Eric,s big 6G74 conversion that yielded the highest horsepower ever pumped out of a FWD Non-Turbo 3000GT/Stealth! The "95mm Flat Tops" available here yielded a 13:1 compression ratio in his engine. Understand that his engine features mega-decked heads that have shaved the cylinder bowls down to a mere 42cc, while the stock heads measure about 52cc. These shorter heads obviously increase the compression ratio using the same piston. In a non-decked head, the compression of these 95mm Flat Top pistons is closer to 11:1 (increasing with decked heads which most will be at least a little for a fresh build) - still higher than the cast pistons that come stock in the engine.

These pistons were specifically designed for this build and feature a flat-top with about -3cc volume in the valve pockets, 1.5/1.5/3.0 ring pattern, wrist pins that are 0.866" x 2.3" using wire locks, and thicker wrist pin bosses that are closer together.

Pair these with the 3SX 6G74 Rods specifically designed for this conversion for your forged bottom end!!
We used and recommend the 95mm MLS Head Gaskets as well.
We used and recommend the Clevite 6G74 COATED Bearings.

 

Upgraded pins and custom Total Seal rings are included with these pistons.

 

The following dyno graph shows the end result of the 6G74 engine built using these pistons that churned out over 280 hp at the wheels directly compared to a stock 3000GT (with an intake filter) that rolled out 159 hp - which is fairly typical for a stock DOHC 3000GT/Stealth.

Click for BIG pic!

The complete details of the build and modifications in Eric,s car are featured here.


For 3.5L Turbo Conversions in 3000GT / Stealth

These are custom Ross pistons made for 3SX and designed to work in the the 6G74 block for those owners doing the 3.5-liter conversion in their 3000GT/Stealth. These are lower 8.5:1 compression sets for those doing a twin turbo 3.5l conversion.

Pair these with the 3SX 6G74 Rods specifically designed for this conversion for your forged bottom end!!

Pins and Hastings chromoly rings are included with these pistons.

The pistons are designed to use pins that are 2.500" long x 0.866" diameter (included are 0.125" thick wall) and use Spiralox. Should you want to get alternate pins - we offer Tool Steel Pins and ubersrtong H13 Pins.

 

NOTE: We HIGHLY recommend that you have your pistons PRIOR to boring your block, so your machine shop can bore to the proper clearances for the pistons. The listed piston sizes are approximate, and as there are different tolerance requirements between different piston manufacturers and even exact size variations between piston production runs, you should never bore you block without having the pistons that are going in the block so the machine shop can bore to match the pistons and their specific clearance requirements. 3SX is not responsible for pistons not matching a bore - take that up with your machine shop that did the bore.

 

 

NOTE: These items are typically custom order and take 3-4 WEEKS to process and ship. Please take that into consideration when purchasing.

 

Picture of Ross Pistons for 6G74 93mm 8.5-to-1 CR
Ross Pistons for 6G74 93mm 8.5-to-1 CR
SKU: PistonsRoss6G74-9385
$789.95
Picture of Ross Pistons for 6G74 94mm 8.5-to-1 CR
Ross Pistons for 6G74 94mm 8.5-to-1 CR
SKU: PistonsRoss6G74-9485
$824.95
Picture of Ross Pistons for 6G74 NA 95mm FLAT TOPS High Compression
Ross Pistons for 6G74 NA 95mm FLAT TOPS High Compression
SKU: PistonsRoss6G74-95Flat
$1,049.95
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