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Old 08-27-2012, 03:19 PM
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Connecting 87 SBC to T-350

Ok guys, im hoping someone here has gone through this and can help me out. I recently bought a new 87 350SBC for 150$ to replace the original which i killed. now im trying to put the engine in but I dont have a flexplate that fits both the engine and will bolt up to the torque converter. I bought a BBC plate that suposedly has holes drilled for a TH350 but its too big and wont fit. i was told there are two types of starters i could use? is there another flexplate out there with 153 teeth? What do?

Edit: 78 pontiac firebird 350chevy

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Old 09-04-2012, 04:19 PM
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Connecting 87SBC to TH350

There is only two flexplates for the 1978 350 engine. These are the 153 teeth and the 168 teeth. You simply buy the starter for which flexplate you have. The chevy 350 is an internally balanced engine. You have to make sure the flexplate is for an internally balanced BBC. The flexplate will not have a weight welded to it below the ring gear. Is the torq converter for a chevy Th350 or a Pontiac Th350? On a chevy the flexplate is for a internal balanced or for external balanced SB or BB. Just the diameter is different. What year motor did you pull out. If it was a 1986 or above it is 1 piece rear main seal crank. The 1978 is a two piece rear main seal crank. This may be why it won't fit.
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