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Posted: 03/14/13
10:56 AM
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Well it's almost spring time and I would like to freshen up my 455. Here are the details; 455 .040 over, Original 350 HO Heads from a 69 Firebird, CC'd to 82 CC's. Ross Flat Tops, Eagle Rods, RPM intake, Stock Crank, Rock And Roll engineering solid cam. 234/238 duration / with .510 lift, but I have 1.65 Harland sharp rockers. Over the last few years I made a few changes.....none have really helped. My best 1/4 mile time so far is 11.61 at 114mph. Its a all stock bodied 69 firebird with a 6 point bar in it, weighs 3550. Anyhow I ran into a problem where the car was turning into a slug, running 11:80s, we thought it was the converter, it had a tight 10" ati converter and 4.10 gears.....so I put a loose TCI 10" in the car...didn't really make a difference. long story short my unilite distributor's limiter broke off so my timing was going up to 50 degrees.....and you ask if I can use a timing light, yes I can, I used a dial back light and it didn't catch the problem...the timing was fine up to 4000, it was above that it went through the roof.....So anyhow more changes. I put a different cam in, it was huge, 252/263 at .050 hydraulic, with 108 lobe centers. Took it to the track, and my tires got blown away...so we re-geared the car with 3.55's and new 29x9 slicks, and it ran well again...7.42 in the 8th mile, 11.70's in the 1/4 (96 degree day)...so the car is street driven...the cam was awful, made my car loud and run way hotter...so I went back to the solid 234/238. Back the the 8th mile, its running 7.70 now....so Im thinking if I put the 4.10 gears back in I may get back to square one, but im also thinking the converter is loose, the throttle response is great with this car, but it seems like its not getting to the ground. Im thinking its the converter..the ATI is in my other 64 GTO and it goes great..another street car with E heads, 250/258 solid cam with .600 lift and 112 lobe angle, Torker 2 intake. It dynoe'd at 543 horsepower and I think the torque was close to 575. I want to freshen up the firebird, the 16's are ported already and seem to be good to go, the compression is high...I just have a lot of runs on it an street time and I want to take it apart and inspect it all, oh and do a leakdown/compression check before hand. At the same time I want to change the cam..im thinking a Crower 60311...Solid, what do you guys think?? I chased my tail for a bit with this car, I think the biggest problem was the broken tab on the distributer advance, and maybe a bad set of slicks. But I know I don't want to ever run that big hydraulic cam again, but may put the 4.10's back in. Let me know what you guys think.
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