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#21
08-23-2021, 03:56 PM
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With the small changes in CR do you understand how few cc's difference is being talk about?
Stan
__________________
Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
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#22
08-23-2021, 06:10 PM
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Stan,now go back and put in 4.21 stroke,also maybe 30 over if block is worn.He said he was going to use a 455 crank.Tom
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#23
08-23-2021, 06:29 PM
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Tom,
If I do that and increase the head gasket bore +30 I would need a 101 cc chamber to start at the same CR as the above graph. Stan
__________________
Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
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#24
08-23-2021, 06:32 PM
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A question for OP.
Are you using 455 pistons along with the 455 crank? The 428 pistons will be wrong on the 455 crank. 
__________________
John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#25
08-23-2021, 07:23 PM
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John,I think he is talking custom pistons!Tom
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#26
08-23-2021, 07:57 PM
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I figured that. But maybe trying to use 428 custom pistons?
The pin height is different from a 428 piston and a 455 piston whether domed or not. 
__________________
John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#27
08-23-2021, 08:10 PM
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Thanks johnta1. I hadn’t ironed that out yet but I have now.
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#28
08-24-2021, 11:04 AM
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i have a ?
I thought compressed head gaskets were typically .039" not .030 |
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#29
08-24-2021, 10:53 PM
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Quote:
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