The only numbers that ar eon the block are GM741C Hiperf pass

With only this info could someone help with the year of manufacture and what perhaps the engine came out of.

where were these numbers located??
Are you sure that the 1 is not a L?

------------------
building a pro/street 78Z
Starting to look like a car again!
Let the fun begin!!!
http://www.cardomain.com/id/spoonlt1355

[This message has been edited by spoonLT1355 (edited August 15, 2005).]

http://www.roadsters.com/bbc/
scroll down for ID numbers

------------------

Those numbers are generic to all 7.4L (454ci) bigblocks. The high-performance passenger thing doesn't mean squat either- it was stamped on all blocks that weren't "tall deck" units used ONLY in trucks- your block could have been from a car or truck.

You need to get at least the casting number off the rear driverside bellhousing flange to determine anything.

Edit: Sorry, forgot to mention- the block could be a 427 (same block as a 454, different crank/rods)- it was also marked the same.

[This message has been edited by Eric (edited August 16, 2005).]

look on the driver side on top where the bellhousing bolts up too. You will see
GM ########

http://www.mortec.com/cast2.gif

[This message has been edited by badazz81z28 (edited August 16, 2005).]