Starting Procharged LT4 Build
Thread Starter
Safety Car
Joined: Jul 1999
Posts: 3,946
Likes: 63
From: Marianna FL
Starting Procharged LT4 Build
I recently purchased a used LT1 block to build as the bottom end for my project. Its a 2 bolt block, so I'm having splayed 4 bolt main caps installed. I've seen different kinds ranging from $90 (Eagle) to over $200 (Milodon). Why such a disparity in price? Are the milodon parts that much better?
Also investigating rotating assemblies. Some folks seem to have an aversion to Eagle rotating assemblies. What is everyone's experience here? I'm looking for the range of 650 RWHP. The big advantage I see to the Eagle kit is that its available already balanced. There do not seem to be a lot of good machine shops in this area, so getting a kit that is already balanced is a requirement. By the way, I'm building a 383.
Also investigating rotating assemblies. Some folks seem to have an aversion to Eagle rotating assemblies. What is everyone's experience here? I'm looking for the range of 650 RWHP. The big advantage I see to the Eagle kit is that its available already balanced. There do not seem to be a lot of good machine shops in this area, so getting a kit that is already balanced is a requirement. By the way, I'm building a 383.
Thread Starter
Safety Car
Joined: Jul 1999
Posts: 3,946
Likes: 63
From: Marianna FL
Originally Posted by vette_tweak
perhaps Eagle parts are made in China; Milodon parts are made in the USA? just a guess...
I suppose I should have asked the question this way: What material is the best for the 4 bolt main caps on my application?
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
Actually the origin of the Iron has alot to do with the strength of the part. If they are using Chinese steel it will not be as strong as if it used American steel. That being considered the country of origin does make a difference.
Thread Starter
Safety Car
Joined: Jul 1999
Posts: 3,946
Likes: 63
From: Marianna FL
Original Purpose of thread: Help from someone with experience with different rotating assemblies and main cap material types.
Responses: Steel from other countries is cheap and sucks!
I purchased a forged Eagle 383 rotating assembly last week. Still haven't purchased main caps as I'm having trouble getting the front and rear caps for the spare block I bought. If it doesn't work out, I'm just going to tear down the original LT4 and use it.
Responses: Steel from other countries is cheap and sucks!
I purchased a forged Eagle 383 rotating assembly last week. Still haven't purchased main caps as I'm having trouble getting the front and rear caps for the spare block I bought. If it doesn't work out, I'm just going to tear down the original LT4 and use it.
Melting Slicks
Joined: Jul 2003
Posts: 2,284
Likes: 4
From: Canton MI
We used the eagle splayed caps and they held under a 800 hp motor. Make sure you get the ones that are on a 22 degree angle. And I don’t know if you added it the cost up yet but plan on spending 800$. You have to line bore and line hone the block pulse the cost of the conversion. That’s not including the cost of boring and honing the cylinders … but its worth the money 
Thread Starter
Safety Car
Joined: Jul 1999
Posts: 3,946
Likes: 63
From: Marianna FL
Yeah, so far the machine shop bill is up to about $1200 including the main caps. I didn't know Eagle had 22 degree caps. I thought they were all 18 degree caps? I just checked the catalog and could not find the 22 degree ones. I have noticed that some other manufacturer's are at different angles.
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Drifting
Joined: Nov 2003
Posts: 1,637
Likes: 2
From: Honeoye Ny
I use Pro-gram in my own car. I also am fond of Callies mains. Made here in the USA by your friends and Neighbors.
Top quality machining from top quality (I bet you can get the material certs if you asked) material. worth the money in my mind ( they only hold the CRANK in)!!!
Top quality machining from top quality (I bet you can get the material certs if you asked) material.
worth the money in my mind ( they only hold the CRANK in)!!!
