Mopar Muscle Association UK

I have just recieved my block back from its rebore and started to clean it, the engine number is definatly GT413 27

On the block by the number 8 cylinder is a large 6 in the casting.

Under the original blue paint are the letters GACB in silver paint.

At the back of the block are the numbers 2658 8362.

And on the left hand side are the numbers 101570, I believe this is the casting date?

Can anybody tell me anything about my engine from this information?

That casting number; 2658836 2. Is a 426 Commercial Wedge.

Cheers Kev, so how does a 426 block become a 413?

Any idea what GACB would stand for?

Jon. Can you measure the bore size for me?

No problem I'll take my mate Vern' home this evening.

So this is a 1970 426 wedge? I had no idea they made any past 1965. Obviously if it is an industrial only engine it would not be in the list of available engines we normally see.

The 413 and 426 (being RB engines) both had the same 3.75" stroke. There was just a difference in bore diameter, 4.18" and 4.25" respectively.

Just measured the bores @ 4.21" with .03 rebore, I'm told it came from a motor home.

That is definately a 413 bore then.

CASTING # C.I.D. YEAR GROUP
1852029 413 1962 RB (Max Wedge)
2120529 413 1959-65 RB
2205697 413 1959-65 RB (Pass.car)
2468030 413 RB

2406730 426 1963-65 RB (Wedge)
2468330 426 1964-71 RB (Hemi)
2658836 426 RB (Industrial)

2536430 440 1966-72 RB
3698830-440 440 1973-78 RB

So what's yer thoughts, Dave??

Mostly about young women in small tops. I am surrounded by them here on the campus. Sigh.

Lucky man

So are there any problems with trying to build an industrial unit to go in a slingshot?

I would assume the casting is the same standard and it wont go bang the first time it fires back into life. I have been thinking of calling the car Prodigy, but I don't want to end up with a Twisted Fire Starter!