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#1
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Piston clearence dilemma
...bought a 67 428 4 bolt block.. ready for machining..and boring to 0.030...stock crank ...bought eagle rods and 0.030 piston from Dss racing,,,the whole assembly was professionally balanced... and now the shocking experience the 428 block had a crack was not seen until the machining process..long story block is not use able... got an other 428 block which was already bored to 0.030 but was a running engine..,so want to use this block but after honing...it was confirmed the piston clearence was to much now...piston from Dss call for 0.003 or o.oo4 clearence (4032 material) but now it works out 0.006....alot more .too much in my opinion......but now im very pissed cause have no other 428 block theyre rare enough....dont know what do ...running at that much clearence ..or not..?
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#2
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Cracked 428 block on the Street might run forever?
2mil over (1mil/side) 428 block might seal on the Street forever? |
#3
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Might just rattle some until wormed up.Tom
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The Following User Says Thank You to tom s For This Useful Post: | ||
#4
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Ill think it nayve rattels when warm also...
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#5
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.maybe...
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#6
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You didn’t say where the crack is. In the cylinder? Put a sleeve in it.
FWIW, my 406 is up to about .007 after a few hones and rebuilds. Arias forged pistons, gapless rings. Does it rattle cold? Probably, but the exhaust drowns it out . . . .😎
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" Darksiders Rule "
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The Following 2 Users Say Thank You to misterp266 For This Useful Post: | ||
#7
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Sadly its not repairable....
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#8
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No assembbly.....0.007 is much for 4032 alloy or do have 2618
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#9
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Fill it to the bottom of the pump holes.
.006 is the recommended clearance for my filled 400 block with Ross pistons. Remember to add .002 extra ring gap. |
#10
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I'd run it! You're only talking about .002 difference, which is an extra .001 per side. It will rattle a little til warmed up, but will be fine otherwise.
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
The Following User Says Thank You to Gary H For This Useful Post: | ||
#11
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Coat the piston skirts
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The Following 2 Users Say Thank You to PAUL K For This Useful Post: | ||
#12
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You have to fill the water jackets before machining.
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The Following 2 Users Say Thank You to PAUL K For This Useful Post: | ||
#13
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Sell the pistons and get a set of .040 over. Or send the .030 pistons you have off and get the skirts coated.
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66 GTO Nostalgia Super Stock/Street Legal Car 421 CID, stock block, Wenzler Intake, 2- Carter 750 AFB's, 3.90 Gears, Full Factory Interior, Full Exhaust, Stock Suspension 3750LBS 9.77@136.99 Multiple NSCA/NMCA World Champion 66 GTO 389 3x2, 4 speed, 4.33 gear, Montero Red 33K original Miles 67 GTO 2dr Post, 428, Tri Power, 3.55 Gears 80 Trans Am Black SE Y84 W72 WS6 |
The Following User Says Thank You to Mike Davis For This Useful Post: | ||
#14
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__________________
66 GTO Nostalgia Super Stock/Street Legal Car 421 CID, stock block, Wenzler Intake, 2- Carter 750 AFB's, 3.90 Gears, Full Factory Interior, Full Exhaust, Stock Suspension 3750LBS 9.77@136.99 Multiple NSCA/NMCA World Champion 66 GTO 389 3x2, 4 speed, 4.33 gear, Montero Red 33K original Miles 67 GTO 2dr Post, 428, Tri Power, 3.55 Gears 80 Trans Am Black SE Y84 W72 WS6 |
#15
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Got ahead of myself.
This company is being used by a local shop on a race BBC engine with used pistons that he wanted the clearances tightened up. They are new to me but have been doing race pistons for awhile new. Also do roots blower screws and turbine parts. Not anything like Calico coatings. Line2Line Coatings https://www.line2linecoatings.com/ FAQ https://www.line2linecoatings.com/faqs.html This company looks to be the answer to the OPs problem and a lot of other people too. When the local guy gets his car out to the track I will know how it worked out. Will report here. |
#16
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Thanks for all your suggestion..the problem im from austria a 0040 piston would be a good option but the backside is that i had to do new balance job again ..they asking for that 1000$ ...once again plus the cost of new pistons.....maybe coating...but how long would the coating last....
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#17
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You'd think a class racer would be a little quicker
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#18
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First hand experience eighteen years and counting. Thousands of street miles, thousands of drag strip passes. Text book answer; indefinetly
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#19
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Line2Line say no re balance needed.
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#20
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Never thought of bracket racing as class racing. I did take a year off, getting slow.
Any experience with Line2Line ? |
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