CO54 Posted December 28, 2019 Report Share Posted December 28, 2019 So we know there are 2 sizes to the Dodge engine blocks. 23" and 25" what is the determining point? If measured from the head I have a 23", when measured from the oil pan I have a 25"? Which is it???? The block casting # is T334*I954........ Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted December 28, 2019 Report Share Posted December 28, 2019 the head should be your reference point..... 1 Quote Link to comment Share on other sites More sharing options...
CO54 Posted December 28, 2019 Author Report Share Posted December 28, 2019 Just to clarify, the head mounting surface correct? Quote Link to comment Share on other sites More sharing options...
JBNeal Posted December 28, 2019 Report Share Posted December 28, 2019 additional information - Flathead Six Engine Numbers Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted December 29, 2019 Report Share Posted December 29, 2019 7 hours ago, CO54 said: So we know there are 2 sizes to the Dodge engine blocks. 23" and 25" what is the determining point? If measured from the head I have a 23", when measured from the oil pan I have a 25"? Which is it???? The block casting # is T334*I954........ There are three lengths of Dodge engines...add the 30" engines found in the Heavy Series Dodge trucks through 1956.? Quote Link to comment Share on other sites More sharing options...
Charlie Stephenson Posted December 29, 2019 Report Share Posted December 29, 2019 Yes 30". A 413 cid would be nice to own. Charlie Stephenson Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted December 29, 2019 Report Share Posted December 29, 2019 20 hours ago, CO54 said: Just to clarify, the head mounting surface correct? That's the correct way as mentioned. Quote Link to comment Share on other sites More sharing options...
CO54 Posted December 29, 2019 Author Report Share Posted December 29, 2019 Thanks for the input gents. With the link provided by JBNeal..... I see that I have a 218 or 230 based on numbers I see, how do you tell if the block is a 218 or 230? Please advise. Thanks. Eric Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted December 29, 2019 Report Share Posted December 29, 2019 218 and 230 blocks are virtually the same. The difference is in the stroke length. So you have to measure the piston stroke to determine the displacement. 1 Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted December 29, 2019 Report Share Posted December 29, 2019 for a bit of added info...measuring the stoke is done at #6 cylinder and you will find a removable plug in the head for insertion of a device to measure the stroke...many use a steel rod, round wooded dowel etc ... 1 Quote Link to comment Share on other sites More sharing options...
tom'sB2B Posted December 29, 2019 Report Share Posted December 29, 2019 218 23" vs 265 25" 1 Quote Link to comment Share on other sites More sharing options...
Pete Posted December 30, 2019 Report Share Posted December 30, 2019 Just to confuse the issue -- in 1937 & 38 Dodge put 216 25" blocks in their half, 3/4, and one ton trucks. That's what I have in my 38 RC, and the build card says it's original to the truck. Pete Quote Link to comment Share on other sites More sharing options...
ggdad1951 Posted December 30, 2019 Report Share Posted December 30, 2019 15 hours ago, Merle Coggins said: 218 and 230 blocks are virtually the same. The difference is in the stroke length. So you have to measure the piston stroke to determine the displacement. IF I remember right (big if), the block PN was the same in the parts book when I looked a few years back. Quote Link to comment Share on other sites More sharing options...
CO54 Posted December 30, 2019 Author Report Share Posted December 30, 2019 (edited) With the head already off, along with all other bolt on items, is there a way to measure the stroke and get the info needed from the deck as a reference? Is there a difference in the connecting rod or the crank that could be identified with a PN# for example? What would be the difference in the stroke length? Edited December 30, 2019 by CO54 typo Quote Link to comment Share on other sites More sharing options...
ggdad1951 Posted December 30, 2019 Report Share Posted December 30, 2019 you could still measure stoke, just need to add the head thickness, and or someone might have the difference with out the head. The crank and connecting rods are different PN's. Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted December 30, 2019 Report Share Posted December 30, 2019 (edited) the stroke can be measured 15 foot away if you have a 15 1/2 foot rod....stroke is the travel of the piston top from one extreme to the other...any other measurement is also static to whatever gauge point you use...head on or head off...head off allows for the actual 'below deck' measurement if needed... 218 has 4 3/8 stroke 230 has 4 5/8 stroke Edited December 30, 2019 by Plymouthy Adams Quote Link to comment Share on other sites More sharing options...
CO54 Posted December 30, 2019 Author Report Share Posted December 30, 2019 23 minutes ago, Plymouthy Adams said: the stroke can be measured 15 foot away if you have a 15 1/2 foot rod....stroke is the travel of the piston top from one extreme to the other...any other measurement is also static to whatever gauge point you use...head on or head off...head off allows for the actual 'below deck' measurement if needed... 218 has 4 3/8 stroke 230 has 4 5/8 stroke Perfect, Thank you!! 1 Quote Link to comment Share on other sites More sharing options...
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