El_TransAm98

iTrader: (1)

iam looking to build a budget 370 lq4..i wanting for only n/a application ,,i saw at summit some speed pro piston flat and there another there dish but iam thinking which ones to use and which heads... i wanting to flycut the pistons also but dont know which heads to use iam looking for 10.9 11.1 compression..i have some 5.3l stage 2.5 heads right now.dont know if to use them or not any advise thanks in advance
Sealed Power ZH857CP75MM - Speed-Pro Hypereutectic Pistons





Piston, Dish, Hypereutectic, 4.030 in. Bore, 1.50mm, 1.50mm, 3.00mm Grooves, 1.325 in. Comp Height, GM, 6.0L

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Sealed Power ZH1129CT75MM - Speed-Pro Hypereutectic Pistons



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Piston, Hypereutectic, Flat, 4.030 in. Bore, Cadillac, GMC, Chevy, Hummer, Each

Part Number:SLP-H1129CT75MM

Tainted

iTrader: (9)

If you are buying pistons then dont buy a new set and flycut them. Buy some made with the reliefs cast into them!

noice

How many miles are on the engine that you have? If it is less than 100,000 and the oil in the pan doesn't look bad then you are alright. The LQ4 has a dish on the pistons that is almost 7cc. With the stock heads you are about 9.5:1 compression ratio. If you really want to change the compression ratio dramatically you have to get new heads.

bww3588

iTrader: (49)

Also, dished pistons do nothing for ptv clearance.

bww3588

iTrader: (49)

Do it once do it right, get a decent set of forged pistons with valve reliefs already cut. Mahle powerpak pistons are decent and relatively cheap. They come with rings and pins. By the time you buy the speed pro pistons, rent the tool to cut them, or pay to have them cut and buy rings, you will be very close to the cost of the better forged pistons you can drop in and go

El_TransAm98

iTrader: (1)

thanks thats true about the pistons they charge me here 300 for just to fly cut all 8 pistons...so ill just better buy some forged piston with valve relief....the only thing i dont get its the compression..so 370 with 317 its just the same as a 6.0 with 317 its at 9:5?

greenvortec97

iTrader: (1)

no because compression increases with bore size i would think..

Correct me if im wrong guys