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Never had a problem with rear main seal leaks until new 512ci stroker build. Everything went per "text book" during break-in except minor but anoying oil leaks. Cometics valve cover gaskets solved half the problem but two tries at rear seal area didn't help. Finally decided to bite the bullet...

Short block is done. Heads are done, well I thought so. Cleaned, maged, ported, gasket matched, polished, hard exhaust seats, milled to cleanup, paint, & freeze plugs. While lapping valves I found small dot in #2 intake seat so back to machinist (I do most my work). Each time we touched it, it...

Ordered my 440-512-5075 kit today. Need to make decision on heads. Early 70's 3462346 casting (right in pic) will need new guides installed or Late 78' 4006452 casting (left in pic) will need hardened exhaust seats installed. Both have 81.5cc chambers & will be ported using DC P4120437 plastic...

Finally finished assembly of 80's Speed-O-motive 451 low deck stroker. A few changes along the way but happy with results so far. Still looking for just the right vehicle & being very particular. Thought mid-70's D100 but thinking Dakota w/full fab chassis. Not very street-able but fun regardless.

I've built my share of small mopars and started to check my "B" blocks I hoarded for years to finally get working on my first stroker. I have 2 early 70's that both mic @ 4.320+/- which is the bore for the 440 "RB", these should be 4.340 minimum. The markings are: casting- #3614230-6 dc-...