Thread: 454 build - what intake and cam ?

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Ok I will go with new pistons. One of my bores has a rubbed line marked on it so to get rid of that line, I need to bore the engine out to 4.35" or bigger

I'm not too keen to zero deck the block right now. When the piston is at TDC, the clearance between the top of the piston and the top of the block is only 0.2mm (0.0078")

I would like to leave that as it is, in case this block has to get decked in the future due to some incident like warping due to over heating or something.

So I have searched for hours online, and come up with these ICON Premium Forged Pistons IC779-100 -

Are these an acceptable brand and type of piston for my build ?

cylinder volume 973.66 (with the new bigger bore size)
chamber vol 115
dome vol 18
gasket vol 10.5 (Fel-pro 1017-1)
ring land vol 1.1 (from my existing piston)
clearance vol 1.8 (keeping the 0.2mm deck clearance)

Compression ratio 9.82:1

If this is all good, I can finally go ahead and order the parts. Will take several weeks to get to me

Originally Posted by ceejay

Ok I will go with new pistons. One of my bores has a rubbed line marked on it so to get rid of that line, I need to bore the engine out to 4.35" or bigger.

Or hone 7 of them to 4.310" for a +0.060" piston and sleeve the one that's scored, then bore and hone it to 4.310". That would give you a far greater selection of pistons to choose from.

Originally Posted by ceejay

I'm not too keen to zero deck the block right now. When the piston is at TDC, the clearance between the top of the piston and the top of the block is only 0.2mm (0.0078")

Problem with that thinking is that you don't know what the piston compression height is, so you don't know if the pistons you are going to buy will be the same compression height or not. You need to know that right now, and you need to know the block deck height right now.

Originally Posted by ceejay

I would like to leave that as it is, in case this block has to get decked in the future due to some incident like warping due to over heating or something.

Sounds like bogus thinkin' to me, particularly since you have no idea what the piston compression height of your new pistons will be.

Originally Posted by ceejay

So I have searched for hours online, and come up with these ICON Premium Forged Pistons IC779-100 -

Piston compression height is 1.645". Rod length is 6.135" Crank radius is 2.000. Sum is 9.780'. Stock block deck height is 9.800". This leaves the piston down in the bore by 0.020" at TDC. Add the 0.039" gasket thickness and you will have a squish/quench of 0.059", too wide to be effective in controlling detonation with 91 octane fuel and iron heads in my opinion. Measure block deck height and piston compression height right now.

Originally Posted by ceejay

Are these an acceptable brand and type of piston for my build ?

cylinder volume 973.66 (with the new bigger bore size)
chamber vol 115
dome vol 18
gasket vol 10.5 (Fel-pro 1017-1)
ring land vol 1.1 (from my existing piston)
clearance vol 1.8 (keeping the 0.2mm deck clearance)

Compression ratio 9.82:1

Disregarding ring land volume, which nobody figures, the static compression ratio would be 9.92:1, far too high for 91 pump gas with iron heads. Hone 7 cylinders for +0.060" pistons, sleeve, bore and hone one cylinder for a +0.060" piston, purchase hypereutectic Keith Black KB203KTM+060 for 5/64 rings or hypereutectic Keith Black KB201KTD+060 for 1/16 rings. I'd choose wider rings for a street motor. Cut the block deck height to 9.780" for zero deck and use 1017-1 head gaskets for a 0.039" squish/quench. Now, that's what I'd do and it would result in a 9.44:1 static compression ratio. You do whatever you think is best.

http://jamisonequipment.com/sites/de...s/BHM-24-1.gif
Add half the main bearing bore less bearings.

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