![]() It's self-tuning and the car runs much better in the cold weather. My brother put a Holley Sniper kit on his '68 Firebird and he loves it. Personally I like Holley carbs, but they're are several good options out there. You'll likely want new heads and valve train to provide better flow. You could even get a 3.875" crank and build a 390 (std bore) or a 395 4.030" bore). At that point, if you're looking for 400hp/400tq you may as well go with a longer stroke rotating assembly. If the block gets an OK from a reputable shop, you've got a clean slate. Irregular vibrations at high rpms can cause all sorts of problems. Take the block to get checked for cracks in the webbing. I wouldn't consider anything short of a full tear down. Its virtually impossible to know the extent of the damage without opening it up. One wheel burn-outs just arent cutting it! The only other modification I really want for this "rebuild/repair/replacement etc" Is switching to Posi-trac. I appreciate any recommendations on what I can do to add some fun with out a second mortgage The truck has been in my family since around 94 and has a lot of sentimental value. I dont have known any issues with the TH350. I believe the rear end gear ratio on this truck is a 3.08(3.07?) as my tach is just about 3k if im doing 85mph with 265/75/15. Or should I buy a crate of some sort and dump this 350? Would I be better off Building a 383 stroker out of this lightly used 350 core,reman 350SB? As the Crank sounds like its in need of a replacement anyhow. Is it safe to assume the Crankshaft is toast at this point and requires engine removal from the truck, crank replacement, and Main bearings done while in there? How much would this cost for a minimal fix with new parts? Is this a smart solution? The motor has never been overheated to my knowledge, but was installed by a rather inept mechanic prior to my ownership. They claim that it is cracked, and others have told me that it has broken in a way that is allowing the motor to run but is on very borrowed time. ![]() when they popped it off, they noticed (and I later verified) a large amount of play on the snout? of the crankshaft. I dropped the truck off at my local repair shop for further investigation, and possible harmonic balancer replacement. ![]() it took care of the pinging of hitting that timing tab, but a deep knocking remained, faint at idle until hot, and noticeable with the vehicle at 0mph and the truck in gear (auto th350 trans). I bent the tab up a bit hoping for a quick fix, until i got the time and $ to replace the original harmonic balancer. Last week or so I noticed a knocking of a two tones (hi,lo) near the motor and noticed the harmonic balancer was hitting the timing tab, and had more wobble to it than normal. Ive got a 1972 C-10 with a jasper reman 350SBC (quadrajet, stock manifolds, stock build i believe) installed in 2014 and ive put about 20k miles on it since the install. Hey hoping to get some suggestions as to an economical yet fun solution to my recent dilemma. ![]()
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