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R1 block vs. currebt R3 block? #371199 07/09/09 06:22 PM 07/09/09 06:22 PM
Joined: Jan 2003 Posts: 9,670 Lima, Peru domingo OP EL Master
domingo OP EL Master Joined: Jan 2003 Posts: 9,670 Lima, Peru	Hi! I was wondering whats the difference between a small block R1 block and the newer R3 currently being sold? Any shortcomings or issues on any of the 2? If you were to build a stout w2 headed small block what would your choice be? Thanks! Domingo

Re: R1 block vs. currebt R3 block? [Re: domingo] #371200 07/09/09 06:36 PM 07/09/09 06:36 PM
Joined: Jan 2003 Posts: 8,547 State College, PA RyanJ moparts member
RyanJ moparts member Joined: Jan 2003 Posts: 8,547 State College, PA	Biggest difference would be the foundry...... R1 was done on production line tooling, R3's are done by Motor Castings Co in Milwaukee. "Generally" the R3's have much better core shift/sonic #'s because of this. No R1's were avail in siamese bores... R3's avail in both siam & no siam R1 will have liter valley that more closely resembles a factory valley, will have oil drainbacks & center will be open to cam tunnel, R3's fully filled in cam tunnel with no drains out of box. R1 will be around 20 lbs lighter than similar R3 due to difference in valley material. Both will have 18 bolt head provisions & +.400" tall lifter bosses. Bottom end/Deck thickness etc, pretty much same on both blocks.

Re: R1 block vs. currebt R3 block? [Re: RyanJ] #371201 07/09/09 08:01 PM 07/09/09 08:01 PM
Joined: Feb 2003 Posts: 885 south louisiana L lowell66dart super stock
lowell66dart super stock L Joined: Feb 2003 Posts: 885 south louisiana	Don't want to highjack this post but I have a couple of questions. Does the R1 require less grinding to use roller lifters than a R3 and is the R1 a better block than the X block? Again, intended use is a W2 head engine. Last edited by lowell66dart; 07/09/09 08:02 PM. 2021 Dodge 2500 4WD Cummins 2020 Challenger R/T Scat Widebody 2007 Charger R/T 5.7

Re: R1 block vs. currebt R3 block? [Re: lowell66dart] #371202 07/10/09 12:03 AM 07/10/09 12:03 AM
Joined: Jan 2003 Posts: 8,547 State College, PA RyanJ moparts member
RyanJ moparts member Joined: Jan 2003 Posts: 8,547 State College, PA	Quote: Don't want to highjack this post but I have a couple of questions. Does the R1 require less grinding to use roller lifters than a R3 and is the R1 a better block than the X block? Again, intended use is a W2 head engine. If anything I'd say an R1 would require maybe hair more clearancing work than an R3 for roller link bars/rivets. R block.. they are drop in deal, as R block does not have inner row of head bolt bosses, lifter valley is like factory block/X block. For all intensive purposes an R1 might as well be an X block other than the 18 bolt capability & I think they have slightly thicker deck, that's about it.

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