[larry bright]

I have a 70 Chevelle SS454 Clone I purchased about 12 years ago. I have been trying to determine what big block engine I have. I have looked at several websites that have casting numbers and codes, but just can't find any numbers or letters that match what is on my block. Where the TH 400 bolts up to the block flange, on drivers side of flange has 10060286, then coming towards the top of the of flange, there is GM 3 P, then CFD ( or could be CFO). On driver side of block near freeze plug is 74 and on passenger side is GM 74. The intake is a Winters, with a 4150 Holley 650cfm.

Any help would be appeciated.

 

[badrad]

10068286...454.......90

The 74 is 7.4L and the CFD is fr Central Foundry Division from what I found. It's the last year of MK IV blocks. It's probably the 210-230HP version.

 

[larry bright]

Thanks, this is much more than I could find!