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#21
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Pontiaclars,
I'm running a 496 with the 4.5 inch stroke Scat crank. Details different from yours: Carb is a Brawler 850 cfm 1.65 Harland Sharp roller rockers compression is 9.9 cam is the same except lsa is 112 heads are cast iron SD heads bought with a bad port job only flow 260 cfm HP 520, TQ 580 I would think you will do much better. If not 600 HP you will be knocking on the door. TQ will be north of 600. Here is my thread: https://forums.maxperformanceinc.com...d.php?t=834864 Here are two videos of the car running. First is the car is not finished and the second is when it is finished. https://www.youtube.com/watch?v=LCVaZqP-PNo https://www.youtube.com/watch?v=941I2R4IVzY Good luck with the build. Last edited by napster; 02-08-2023 at 11:01 AM. |
#22
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#23
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520 hp is not bad out of a iron head flowing 260 cfm and with under 10 to 1 compression and that Cam duration.
The most I would say you could get with flogging it for a few hours on a dyno is 537, so your not too far off.
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I do stuff for reasons. |
#24
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That would be my thought on it. With a bigger engine I'd certainly go more on the camshaft. It's a nice fit for 450-ish cubes and very streetable, even with mine on a 110 lsa.
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#25
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.540 lift would approx at 280cfm Consider those test numbers just as the Best Port , not necessarily all 4 ports , and not a 4 port overall average. We don't know those facts. Might should deduct for the unknown and call it 270cfm overall average at .540 lift Then maybe add another 5cfm for buttering them up a little. 275cfm should be pretty reasonable without going over board. You have 550hp range pretty much locked in. And possibly more with a super tuner testing it on a happy dyno. Have you gotten to the point of mounting or test fitting the Intake Manifold yet ? Mentions have been made of some intakes not sealing at top of port on ports that tall , and I believe they were referencing 2.20-2.25 range. You are at 2.35 Just curious is the only reason I ask. |
#26
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Your engine sounds like a lot of fun. Good numbers! And very nice car you got! I also have 1.65 rockers, so lift is a bit more than I wrote in the spec list. |
The Following User Says Thank You to PontiacLars For This Useful Post: | ||
#27
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No, test fitting of manifold yet. Will definetly keep that in mind though. |
#28
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-6an will supply more than enough fuel for your needs. On a normally aspirated engine, you don't need much more line until you're getting close to or above 750ish hp. If this was a boosted application where there is more fuel demand, I'd start thinking about it in the 650hp range.
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-Jason 1969 Pontiac Firebird |
#29
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530hp and 575 tq all day unless you get more head flow
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#30
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The KRE standard design Northwind 4150 intake is listed with a RA IV port match machined into the intake. That would be about a 2.200" tall port opening.
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
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