Mopar X-block question

JCChildress · 10-13-2011, 09:09 AM

The shop I work at, we build a lot of Nascar Late model stock engines. The Dodge engines are R blocks with 59 degree lifter banks and 340 mains. We run around a 4.020 bore and the deck height starts at 9.200 and we cut about .100 off. They are real heavy and very hard to find. I would like to find an old X-block for a new engine were building but first I need to know how short we can safely cut the deck on an X-block. Surely someone would know. Also if anyone knows the whereabouts of one of these blocks, please let me know. Thanks so much.

GTX JOHN · 10-13-2011, 02:55 PM

Standard Deck block are supposed to be 9.56 as I recall. To get to 9.10 is almost a .5 cut which is huge. I am skeptical that you would have a very good engine with that kind of Cut. I have a couple in the shop so I try to get a approximate measurement on the thickness when I get home Tuesday from FallFling Show if needed.

Disclaimer: I am not a machinist OR even remember what I had for breakfast
so all opinions I give should be independently verified.

quickford1 · 10-13-2011, 04:07 PM

e-mail me your number or call me at 704-784-8376 I might be able to help you on these blocks.
Rich

10-13-2011, 09:09 AM	#1
JCChildress Member Join Date: Apr 2007 Posts: 195 Likes: 7 Liked 10 Times in 4 Posts	Mopar X-block question The shop I work at, we build a lot of Nascar Late model stock engines. The Dodge engines are R blocks with 59 degree lifter banks and 340 mains. We run around a 4.020 bore and the deck height starts at 9.200 and we cut about .100 off. They are real heavy and very hard to find. I would like to find an old X-block for a new engine were building but first I need to know how short we can safely cut the deck on an X-block. Surely someone would know. Also if anyone knows the whereabouts of one of these blocks, please let me know. Thanks so much.

10-13-2011, 02:55 PM	#2
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,726 Likes: 2,775 Liked 2,447 Times in 691 Posts	Re: Mopar X-block question Standard Deck block are supposed to be 9.56 as I recall. To get to 9.10 is almost a .5 cut which is huge. I am skeptical that you would have a very good engine with that kind of Cut. I have a couple in the shop so I try to get a approximate measurement on the thickness when I get home Tuesday from FallFling Show if needed. Disclaimer: I am not a machinist OR even remember what I had for breakfast so all opinions I give should be independently verified.

10-13-2011, 04:07 PM	#3
quickford1 Member Join Date: Aug 2008 Location: Davidson, NC Posts: 269 Likes: 521 Liked 20 Times in 12 Posts	Re: Mopar X-block question e-mail me your number or call me at 704-784-8376 I might be able to help you on these blocks. Rich