Camaro 3.1, 3.4, and 3400 parts needed

[bachert24]

The 3.4 gasket is 0.040", yes, the 3400 gasket however is 0.060". This is because the 3400 piston comes proud of the block by 0.020". Using too thin of a gasket can lead to the piston and head meeting each other.

Also strokes are exactly the same between the 3.4 and 3400.

Based on the info that is pre-filled into that CR Calculator the stroke is .003" shorter on the 3.4L, is this incorrect? They are listed as 3.307 and 3.310. So you don't think .0065 deck height is enough? I only ask because the stock 3.4L is listed as .0095" while the 3400 is listed as -.020. Doesn't that -.020 clearance mean it goes above the deck that far? It's odd one is listed positive, miniscule, but still positive ; while the other is listed as negative. Fill me in Raven!

[Guest]

No, stroke is the exact same. The calculator is probably filled with spec information where one source rounded up and one source did not. Both the 3.4 and 3400 use the same 981 casting crank.

The 3400 piston does come proud of the block by 0.020". It's the piston that determines this, not the block. The 3.4 piston is down in the bore a small amount, hence the positive and negatives in the calculator.

[bachert24]

No, stroke is the exact same. The calculator is probably filled with spec information where one source rounded up and one source did not. Both the 3.4 and 3400 use the same 981 casting crank.

The 3400 piston does come proud of the block by 0.020". It's the piston that determines this, not the block. The 3.4 piston is down in the bore a small amount, hence the positive and negatives in the calculator.

Ok so when you say "proud of the block" you are saying that it goes above the block .020" and the 3.4L is below the deck by .0095". I understand now.

[bachert24]

No, stroke is the exact same. The calculator is probably filled with spec information where one source rounded up and one source did not. Both the 3.4 and 3400 use the same 981 casting crank.

The 3400 piston does come proud of the block by 0.020". It's the piston that determines this, not the block. The 3.4 piston is down in the bore a small amount, hence the positive and negatives in the calculator.

Ok so I recalculated the compression ratio and changing the gasket thickness from .040 to .060 and the deck height from .0065 to -.020 moved the compression from 9.06:1 to 9.16:1 and also moved the quench from Less power to ideal. Thanks for all the info and all the help Raven and Caffeine, you guys got me to research like crazy and now I know exactly what parts I need.

Since I am buying 3400 pistons should I go ahead rebuild them while they are out with all new bearings, bolts, pins, and rings? Or is that a waste of money? Now to find all the parts I need to beef up the heads!