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#1
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High Port timing
I had my first outing last week after having to redo my whole engine from last year. I ended up with a little smaller cam 273/277 , ground on a 104 and installed on a 104. Car ran the same as last year so wasnt surprised. .
I had the timing locked at 30 and decided to drop down to 28. I picked up a .1 in the 1/8 and 1.39 in the 60 ft and 6.49. I was surprised how much it picked up, all this time i thought 30 was where it needed to be. I tried 27 and lost .05 so went back to where it was.
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Illinois Outlaw Gassers 6.27@107 9.97@131 |
#2
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My high ports liked 28 also.
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A new best of 9.135 @ 145.41 71 Lemans Sport. 72 Lemans Sport. |
#3
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Is that NA?
Sounds like a good improvement.
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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 |
#4
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Yes, na . 4500 victor and 1050 dominator
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Illinois Outlaw Gassers 6.27@107 9.97@131 |
#5
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Quote:
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#6
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Nothing special, 60 over so a 469, 72 cc 380 hihh ports.
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Illinois Outlaw Gassers 6.27@107 9.97@131 |
#7
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Interesting! I had read that some engines with High Ports liked 28 degrees. The only engine I built for a customer that had those heads on it was a aluminum block 505" . That particular engine liked 32 degrees on the dyno. Real life at the drag strip may show something different though.
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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 |
#8
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My na 535 with 390 cfm Kauffman D ports loves 39 but that is at 9000 density altitude. The 505 with high ports is the same.
I'm in denver at Bandamier mostly. But even at 1200 feet the car ran best at 32.5. Fyi the engin info is: 535 C14 gas 68 cc high ports T&D shafted crank driven msd 6al... old school lol The track tells the truth. Pontiacs like alot of advance up here. Some pontiac guys up here are at 40 and happy. My 535 d ported car picked up .1 moving from 32.5 to 39 degrees. The 505 high port set up wasn't quite as much increase but much heavier car too. |
#9
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Fuel plays a big roll in timing as does other factors. Basically every engine will be slightly different and you need to test to find out what works
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