I was referred here off the HAMB, by a member here and would like to pose some questions to you all.  Motor is going in my 49' Ford, and I have 3 Y's to start.  I have a 272 I want to use for mock up and as initial runner.  Then I got a deal on a 312 block and crank, a factory dual 4's aluminum manifold with Holley 4000 teapots, a big as isky cam that was ground for kens and leslies, that I wont use (to big I think for the street).  All the misc. oil pumps etc.  2 of the motors were complete the 312 was not.  So....... Do I build that 312, or do I find a 292 and have the crank turned down and build that.  Two of the head sets I got were the larger 1.92 valve heads one set is an ECZ-G heads.  I want decent horsepower, looking around 300 if it can be reliable, cause I know I'll beat on it.  I'd like to say money is no issue, but it is, but I wont skimp if thats what I need.  Hell I got a 46' knuckle motor that I have 4k into and still have a little to go, and still wont have any serious horsepower.  So if I gotta sell a kid I will.  Can I get some input and advice.  PS, I am new to these motors (cars) and fell in love with the Y-block, sound, looks, all of it.  So lay it on me, still searching around the site, but would really like a little interaction with members.  Thanks.

So you have a complete 272 and a 312 block and crank? Any 312 rods?.



What is the third "Y" engine that you have and its condition?



Oldmics

Block, crank, 2-4 intake, G heads, add pistons and rods and it sounds like you have everything you need to build the 312. Anything else can be donated from one of your other engines. See if you can find the specs on the cam. It might not be too big and will save some cash.


Lawrenceville, GA

The other 272 was another runner, that I picked up for parts for the 312, it had the ECZ heads, timing cover, oil pan/pump, etc.  I have rods but am short 1, so I dont know if that makes them usless or if I can hunt down just one.  He gave me a set of .030 pistons for the 312 but I have no info on those, the cam I still have the spec sheet on, I'll post it when I have access to it and a computer at the same time.  Question is should I have the heads worked or jump on the waiting list for a set of the new aluminum ones!  Thanks so far.

If you are going to use the 312 crank, you will have to use 312 rods, either ECZ or C1TE.  A 272 will have EBU rods, too long for a stock 312 piston.  Individual rods are available, I'll sell them individually.

John - "The Hoosier Hurricane"

Thats perfect, cause I didnt know my chances of finding 1 individual 312 rod.  What about the guys that are going to the new H or I beam rods?  Necessary or not on a street motor?

Not really necessary when building a good street engine, even ok with some strip use but I would update the rod bolts to ARPs or something of a better grade than factory.

-Gary Burnette-

A set of fully prepped truck rods with new bolts are adequate for most street driven purposes and can be had in both the common Y-Block lengths (long:292 & short:312).  If going with any kind of custom piston, then make it a point to use the longest length connecting rod possible.

 

As far as I know, John Mummert has the only ‘new’ replacement connecting rods for the Y.  As another alternative, aftermarket rods for the scrub engines in both H-beam and I-beam designs can be fitted to the Y with some work but typically requires a custom piston or reworking a readily available piston so that both the pin size and pin location are correct.  These same aftermarket rods also requires that the crankshaft rod journals be turned down to a scrub journal size and the rod widths themselves being trimmed down to work on a Y crankshaft.

Lorena, Texas (South of Waco)

For the new guy, scrub = Chevy.


Lawrenceville, GA

So I can use the longer rods, say out of a 272, would that increase the stroke even more, but would need a custom piston to work, is this correct?  Yeah, I picked up on scrub=cheby, thanks.