This afternoon I took some pic's of the underside of the truck, for Welded Hemi (Bob) to look at so he can work on a driveshaft hoop. Denny decided we needed more oil pressure above 3000rpm, so that's what he worked on.

 

The rod length is at 6.125".

I thought the stock rod length was 6.240. Also, a botton will not solve the problem. A roll pin has to be installed to keep the lower oil ring from migrating to the piston pin hole, or a special oil ring pack used, that has dimpels on the lower oil ring.

 

http://www.beckracing.com/page09.htm

 

Thanks again superjay, That link was very informative. I'm going to print that one out and keep it on file. The stock rod length for the new Hemi's are 6.123" Same as the older small blocks. The 5.7 has the same bore and stroke as the old 318's. The 6.1 is almost the same as the 340, except for a larger bore of 4.055" vs the 340's bore of 4.04".

 

man I am so lost... are you putting the 396 or 6.4 hemi in a truck or just the parts? I just wanted to know, because I want to install the 6.1 parts I have and looking on all of this, do I need to go back and order some more parts?

I have the 6.1 cam,heads, and intake.

 

It is impossable the 5.7 has the same bore and stroke of the old 318. If it did, it would be a 318, not a 345/346 cu. in motor. Also, either you, or the below article is wrong on rod length. Strongly suggest you find who's wrong before ordering pistons. Just trying to keep folks from making costly mistakes.

http://carcraft.com/techarticles/116_0410_hemi/index1.html

 

The 6.1 is almost the same as the 340, except for a larger bore of 4.055" vs the 340's bore of 4.04".

Also wrong. The 5.7/6.1 stroke is 3.58, while the 340 is 3.31. God, I'm starting to sound like a bitch. No more corrections today. I'll be good, I will, I will.

 

ShsuII, I know superjay and I can get a bit confussing at times. It's like my daughter trying to get me to listen to rap music. I don't understand a thing they're saying either. lol. I know this topic is quite long, however, its the day by day process of building a performance engine. We appriciate superjay's input. He's been building motors for 38 years. Denny is going into the Star Trek mode, of being, "In places, no man has ever been". In short shuII, we are taking a new, 6.1 short block, and making it into a 6.4. We will be using all the 5.7 parts, such as the heads, intake manifold and oil pan, etc. etc... The only 6.1 parts we are adding to the 6.1 short block is a modified 6.1 oil pump, cam and head gaskets. Everthing else is custom. The crank shaft, rods, pistons, rings, valves, fastners, fuel and timing contollers and on and on and on........ Oh by the way, the 5.7 heads have been EXTREMLY modified.

For your 5.7 motor with the 6.1 upgrades you have, you will also need:

#1 You will need Stu's custom mounting plate. If you have an 04 or 05, you will need to modify the right cylinder head for the EGR valve. Extend your fuel lines. I would throw the external valve dampners away, plus your valve springs, on your 6.1 heads and opt for the Manley goodies. Get those from Welded Hemi. You didn't say whether you had the 6.1 injectors and fuel rails. I'd get those also. I'd probably get the shorty wires from Art, to simplify the plug wire issues. I'm probably forgetting a few things, since the mod's that your doing are different than our's. Uniball would be the man to talk to on this one. It sounds like he is doing the same build as you.

 

Thanks again superjay, What i meant to say is that the bore and the rod length are the same. Not the stroke.

 

the 6.1 injectors and fuel rails

If you have an 04 or 05, you will need to modify the right cylinder head for the EGR valve. Extend your fuel lines. I would throw the external valve dampners away, plus your valve springs, on your 6.1 heads and opt for the Manley goodies. Get those from Welded Hemi. You didn't say whether you had the 6.1 injectors and fuel rails

I have the rails and injectors already on the intake. what is the EGR valve and what or how do I go about getting it modified? my is a 04.

Now the dampners....are.....what?

What about the valve springs? ""plus your valve springs, on your 6.1 heads and opt for the Manley goodies""" what does this mean? sorry tires and wheels are my thing.

 

here is a picture of the dampners

 

Your 6.1 heads should have the valve springs, like shown in the middle.

 

do I need to up grade the springs to the Manley? or will I be ok. on the dampners Art showed me that I must have for what he said they were called.

 

shsuII I'm not saying this might happen to yours, but mine broke from my modified 5.7

 

Hemi2nv, check your PM please.

 

hemi2nv,
If you a chance, any way of checking to see if the pin end width (the thickness of the rod that the wrist pin goes through) and the crank end width (the thickness of the rod that the crank journal goes through)on the 6.1L is the same as the 5.7L? Also does the 6.1 rod have an offset like the 5.7? Thanks for all of your help.

 

04HEMIQUAD, I'll check it out for you soon. I take it you want to know the rod thickness, like .938"? The pin sizes are different on the 5.7 vs the 6.1, but I don't have that information for you here at the house. Here's a note. The 5.7 pin is pressed and the 6.1 is full floating. The 6.1 rod weighs 653 grams, the pin with clip weighs 153 grams and the piston with rings, weighs 477 grams. Anything else you need to know, just post it. We'll try to help you out. Thanks

 

Originally posted by hemi2nv:
04HEMIQUAD, I'll check it out for you soon. I take it you want to know the rod thickness, like .938"? The pin sizes are different on the 5.7 vs the 6.1, but I don't have that information for you here at the house. Here's a note. The 5.7 pin is pressed and the 6.1 is full floating. The 6.1 rod weighs 653 grams, the pin with clip weighs 153 grams and the piston with rings, weighs 477 grams. Anything else you need to know, just post it. We'll try to help you out. Thanks

Awesome hemi2nv greatly appreciated many thanks. I know the 5.7 wrist pin is 24mm diameter, is the 6.1 different and are the lengths any different?

 

The rods are identical except for the smaller, pressed pin on the 5.7. Can't give you a good number on that one. We didn't want to take the 5.7 piston apart, but we measured the 6.1 pin size at .985". The rods varied in width, on the big end, from .973" to .978". On the small end, they measured .935" to .938". Remember that the 6.1 rod bolts are 3/8" compared to the 5.7's being 11/32". You could take the beefier 6.1 rod and rebush it to fit the 5.7 piston.

 

Thanks for the great info hemi2nv.

 

Sorry, my mistake.
The small end is .875 wide on both 5.7 & 6.1
The big end is .935-.933 on both.
The only difference is pin size and bolt size.

 

Umm...SUBSCRIBING!!! I'm a little late to the party, I see. Lots of great info hemi2nv...looking forward to the end result.

 

Rob, Good to see you on the site again. I was wondering where you've been.
Today we recieved the other set of rods. The custom Ferrea valves should be in sometime late next week, along with the custom overdrive, ATI dampner/pulley. ARP put us on the train again, and said that our studs will not be shipped until Feb 28th. Another 3 week delay. They were suppose to be here this week. The heads should be done in the next 2 weeks and then, we can FINALLY order the pistons. The stock torque converter was shipped out yesterday to Continental Converters for the 3500 stall upgrade. Well, thats all we have for today. Will keep you updated as always.

 

Here you go guy's. We have most of the parts for this project on the way. That means we have an excess inventory of parts. For those of you following this project, we will give you first dib's on what we have. We have left over 6.1 forged cranks, new 6.1 stock pistons and rod's, a complete balanced, rotating assembly for a 5.7 (slightly used, but in perfect condition), 5.7 blocks, 6.1 cam's and other misc parts for the 5.7 and 6.1 motors. Custom, JW Performance heads will also be available shortly, to HTC members. Let us know.

Thanks again

 

hemi2nv, that just awesome. I love reading this thread. So much to learn..