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| Slantsix upgrades https://www.slantsix.org/forum/viewtopic.php?t=62814 |
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| Author: | slantsix64 [ Sat Sep 08, 2018 12:35 pm ] |
| Post subject: | Slantsix upgrades |
Hi guys so I installed a Howard's 473 lift camshaft in my 225 also milled the head and now have 9.1 compression, I'm currently running a super six two barrel carb to a single 2.25 pipe question is would I benefit adding a Holley 390 to my set up and a dutra dual up front? And would I lose economy |
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| Author: | Dart270 [ Sun Sep 09, 2018 4:42 am ] |
| Post subject: | Re: Slantsix upgrades |
I would do the Dutra exhaust first, as that will help both power and economy. Holley 390 may or may not help either. Likely you would get worse MPG and depending on tuning you might get better power. The supersix carb, if in correct tune, does very well for both power and mileage with a mild motor such as yours. Here are a few questions to help with setting your car up right. Can you post your cam specs? What is your compression ratio? Did you "degree" the camshaft when you installed it? What valve lash did you use? Lou |
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| Author: | slantsix64 [ Tue Sep 11, 2018 7:32 pm ] |
| Post subject: | Re: Slantsix upgrades |
I have 9.1 Compression, i did not degree the camshaft just lined up the dots on the both gears, my valve lash is set at 0.22 hot in and ex Advertised Duration Intake - 255 Advertised Duration Exhaust - 255 Duration at .050 Intake - 220 Duration at .050 Exhaust - 220 Valve Lift w/OE Ratio Rockers Intake - .473 Valve Lift w/OE Ratio Rockers Exhaust - .473 Lobe Seperation Angle - 110 Intake Centerline - 106 Valve Lash - 0.022 Car has a real nice idle i had to retard the timing a bit, really pulls hard and smokes up the tires with the 4 speed and 3.55, to bad i just busted a tooth on a ring gear today sucks. |
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| Author: | Rick Covalt [ Wed Sep 12, 2018 7:23 am ] |
| Post subject: | Re: Slantsix upgrades |
Quote: i did not degree the camshaft just lined up the dots on the both gears
You really should degree the cam. There is a 50/50 chance that it is anything close to where it should be. That being said, if it runs well I would not pull it apart and degree it.I am running that cam in my back-up race motor with a 600 Edelbrock because that is what was on my big bore engine. You would be fine with a 500 Edelbrock or stay with the BBD. You can run the Holley if you like but they do take a bit more tuning. |
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| Author: | Dart270 [ Wed Sep 12, 2018 10:59 am ] |
| Post subject: | Re: Slantsix upgrades |
If it is running very well, then I would not take it apart. 9:1 comp should work very well with that cam, as it sounds like it does. I would do Dutras and 2X2" head pipes into 2.5" Y-pipe (Flowmaster Y or similar, no muffler shop cobble up) just behind the trans X-member then single 2.5" out the back and see how that improves things. Enjoy! Lou |
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