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#41
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^^^ OK, that's interesting. Good stuff.
Hmmm... Previous owner left you with some unknowns. Maybe the cam isn't installed correctly? How would an engine act if it was installed one tooth off on the timing chain? Thinking out loud.
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"...ridge reamer and ring compressor? Do they have tools like that?" |
#42
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The heads are the pre-assembled ones.
It runs good up to 3200 so it's not the timing chain off a tooth. |
#43
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Low float level.
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Triple Black 1971 GTO |
#44
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Here's another vote for that being low rpm torque/ towing cam.
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#45
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This statement sounds like you have a mismatch of parts ......could be any Number of things including your small cam mismatched with Intake, carb, and or exhaust........quite possibly cam installed improperly ( advanced or retarded)
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71 GTO, 463, KRE 295 cfm heads ported by SD Performance, RPM intake, Qjet, Dougs Headers, Comp cams HR 246/252 ...11 to 1 , 3.55 cogs, 3985lbs.....day three- 11.04 at 120mph ....1.53 60', 6.98 1/8 mile |
#46
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Full 12 volts powering the HEI?(check it with a volt meter if you're not sure) They will lay over dead like that running 9 volts trying to power the HEI. Don't ask me how I know...
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'65 Tempest 467 3650# 11.30@120.31 |
#47
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If it’s a 75 400 block it’s not gonna last long enough with that combination of parts for you to worry about octane.....just saying
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468/TKO600 Ford thru bolt equipped 64 Tempest Custom. Custom Nocturne Blue with black interior. |
#48
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Makes sense. Thanks. I have the same carb on my old truck. I'll swap them out and see.
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#49
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I'll check that and also swap out the distributor from my other Bird. Thanks.
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#50
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Can you add too much booster and get problems like this?
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#51
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Verify carb actually going full throttle with gas pedal on floor, both primaries and secondaries
An engine will rev. freely with partial cfm. in park but lack at wot. with a load A 2800 cam in a 400 should act real close to the stock 4bbl. 067 cam with a little more torque
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A man who falls for everything stands for nothing. |
#52
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Quote:
Here's the important thing for diagnosing; I have plenty of pedal left. I can jamb the pedal to the floor but it's just like when you run out of pull in 1st gear. It's acting like it at 6000 rpm when it's at 3200. Like there's nothing left. Like the engine has reached it's red line. Just like valve float. You make a good point at the end. It should run good. We can debate the build. But any small improvements that could be made on the build do not come close to addressing the problem. It should run good or great, not only go 65-75 mph with 3:36 gears. I need to find the malfunction. |
#53
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I was getting 93 octane last year and adding octane booster. It just kept getting worse. Then yesterday, first test of the year, I added another bottle to half a tank. Maybe the fuel in the tank is just bad now.
Here's the deal again; The engine runs good up until 3200 rpm. I can squawk the tires in 1st and second. No problems until 3200. It acts like 3200 is the red line. Right when you expect the super nice pull it gives up. It doesn't sputter and die. It doesn't go dead like a short. It doesn't act like it ran out of gas. It acts like valve float. I raced firebirds through the 80's. Got trophies at Mid Michigan Motorplex. I know my Pontiacs. Built a really nice 428 myself. Set up nitrous on it. Had a lot of fun. Never thought I would get stumped like this but here I am. No ego left, just want it to run. |
#54
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Even if you where running on the primary's only on level ground the motor would still rev well passed 4000 rpm if it can do such out of gear!
As I stated early on here your compression is no more then some 9.2 yet your cranking compression is way high, this and your lack of rev's leads me to say that the Cam was installed one tooth advance by mistake , or a advance key was put in intentionally!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#55
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You have pedal left? Not to beat a dead horse look down carb with somebody on the pedal make sure butterflys are fully open they could be binding also many have reported not so good results at WOT. with edelbrock AFB style carbs
Wouldnt hurt to try different components if you have another carb laying around In the aircraft industry we called it swapolligy
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A man who falls for everything stands for nothing. |
#56
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Yes, I did that. The secondaries are opening. It pulls good at WOT through the gears but only up to 3200. You can hide the problem by shifting up. It's pretty quick if you keep shifting early. I can get to 60 mph but that's it.
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#57
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I thought I saw the question asked on this thread already but can't find it - will it free-rev beyond 3200 rpm with no load?
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears '69 LeMans Vert, 350, #47 heads: Non-running project |
#58
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Quote:
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#59
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The Stump Puller cam 230/236 would be great with this engine. Here is a good deal on one: http://forums.maxperformanceinc.com/...d.php?t=828503
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears '69 LeMans Vert, 350, #47 heads: Non-running project |
#60
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You do not have any issues to look for in regards to the springs on those heads limiting the motors rpm if it will rev passed 3200 out of gear so stop going back and bringing that up.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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