Is this too much compression for 93 octane?
#1
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Dart 205's milled to 59CC,.040 Cometics,stock 346 shortblock = over 12.1CR?
Would u leave the heads alone and just run the 62CC with the .040 Cometics for 11.3CR?
Even with a small cam would the LSX intake help me?
Cam is 214-222-566-569 115+4...
Running threw shorties and HF cats (Thats why the big split)
Would u leave the heads alone and just run the 62CC with the .040 Cometics for 11.3CR?
Even with a small cam would the LSX intake help me?
Cam is 214-222-566-569 115+4...
Running threw shorties and HF cats (Thats why the big split)
#2
TECH Addict
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I think you definitely do not want to go 12:1 SCR and check your DCR - it's going to create more problems than you want with 93 octane.
I would say the LSX intake will be marginal but the head and port velocity/runner length guys will need to chime in.
I would say the LSX intake will be marginal but the head and port velocity/runner length guys will need to chime in.
#3
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Originally Posted by JS
Dart 205's milled to 59CC,.040 Cometics,stock 346 shortblock = over 12.1CR?
Would u leave the heads alone and just run the 62CC with the .040 Cometics for 11.3CR?
Even with a small cam would the LSX intake help me?
Cam is 214-222-566-569 115+4...
Running threw shorties and HF cats (Thats why the big split)
Would u leave the heads alone and just run the 62CC with the .040 Cometics for 11.3CR?
Even with a small cam would the LSX intake help me?
Cam is 214-222-566-569 115+4...
Running threw shorties and HF cats (Thats why the big split)
I get 11.32:1 SCR for 62cc heads and .040 gaskets
And to the question of which one to use, it depends on the camshaft specs and what DCR you end up with.
Hammer
#5
LS1 Tech Administrator
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Yeah, what he said. I don't get 12.0:1. It's lower...closer to 11.7ish:1. Remember when calculating DCR that even XE-R lobes rarely get close to a 49 degree ramp rate. They're more like 50 or 51. This will make actual measured DCR lower than the "calculated" DCR.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
![](https://ls1tech.com/forums/signaturepics/sigpic210_1.gif)
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.