[wylee]

end of crank,bog balencer,3956618 cast # 4'' bore i think 3'' stroke.( ill find out about when by buddy comes over).shame no #'s on the front pad.

 

[Cptnbob]

I would say that is almost certainly a 302. The balancer is a good clue. A late '68 or '69 as the '67 and early '68 blocks were two bolt mains. Missing numbers are fairly common. It could have been a replacement block, a short-block assembly or the block may have been decked. That's a super find! No problem with your investment here. Congratulations! Robert

 

[1955 D/GAS]

Robert your right, sure looks like it may be a 302. The 3956618 casting is sure a 68-69 302 or 350. Wylee check your crankshaft casting/ forging number. It should be 3941178 for a 302 and looking at the pics yours is forged so that is a good sign! Brian

 

[1946Austin]

Yes, definitely a great one to own if it's a 302! Boy I love the way thoe things wind!

 

[wylee]

the oil pan has a windage tray. found a # 1178 on the crank, will get more pics...

 

[1946Austin]

Couldn't find that number at all on the list? A 3279 shows as the 67-69 302 crank for a Z28.
http://www.nastyz28.com/sbcmenu.php

 

[Cptnbob]

Wylee, It appears you have the head off one side. It should be fairly easy to measure the stroke. If it is 3 inches that will tell you. It couldn't possibly be a 283 as they were not made with 4 bolt mains. The harmonic balancer appears to be factory and that size balancer only came on the 302. That said, the condition of block, crank, pistons and rods are of most importance. It also appears that motor has been into or rebuilt as have most that age. I would have a "trustworthy" machine shop examine the afore mentioned parts. The main draw-back with these motors is parts availability and cost. But to those of us who know and love those motors for what they were, it's $ well spent. Robert

 

[1955 D/GAS]

Looks like there were 2 different casting/ forging #s. A little further down the list it shows 3941178 also. Brian

 

[Cptnbob]

Not sure but I think the two had something to do with the early and later blocks. It's been a while since I built one of these.

 

[1955 D/GAS]

3279 possibly a small journal?

 

[Cptnbob]

I think that is right. Chevrolet didn't make the large journal small blocks until '68.

 

[1955 D/GAS]

Yea and there was never a small journal 4 bolt main.

 

[wylee]

more.......

so far ive found the 1178 casting. pic of the oil pan. also inner and outr rockers off.

 

[Marks63PontiacGasser]

Nice find and what a motor. U guuna B habben some fun nau bud! Love those 302's. Mark L

 

[mt94ss]

Nice find, Wylee! Time to get some good mics and bore gauges and do some blueprintin'. Sounds like a fun motor.

Mike