Sprint Identification for 1968

Q: Sprint Identification for 1968

Looking at 1968 6 cyl. firebird, 4 barrel, single exhaust. Supposed to be all original. Is this right or is it supposed to be dual exhaust? What do I need to check next?

A: IF its a Sprint It would have single exhaust but have a dual outlet exhaust manifold. A “Y”-pipe would join the two outlets into one header pipe. There are several Sprint only identifying features/parts, all of which a 1 bbl could be upgraded to. If the engine code is ZD and the VIN matches the engine VIN# then its a correct block for a Sprint.

Heres a list of some of the other features of a Sprint 1968:

• larger crankshaft harmonic balancer

• 4 bbl Q-jet #7028261 (M/T) 1968

• Chrome lid 4 bbl air cleaner

• 4 bbl intake manifold

• Special dual outlet exhaust manifold

• 4bbl only cylinder head with dual valve springs,smaller combustion chamber for higher compression ratio

• Larger lift and longer duration camshaft

• distributor is recurved for more advance

• Sprint badges on the rocker panel mouldings

• 3.55 rear end ratio

• Rod bearings were also the heavy duty ones but thats not apparent without engine disassembly

So as you can see all of the parts except the engine block could be added to a base 1bbl car. If you are really serious about this get the history on this car from PHS. They can fax it to you if you are in a hurry.

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