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Old 02-23-2008, 05:22 AM
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Your opinion

Just trying to get an idea on what you all think of this engine combination. 468 inch Chevy big block, 454 .60 over. Assembly balanced crank is cut 10 and mains were cut 20 and block was deburred , block line bored , There are Milodon aluminum "H" Beam rods and Keith Black Hypereutectic pistons with .330 domes with valve reliefs. Compression works out to 10.5 to 1. Rods have full float wrist pins and bronze bushings, rods were drilled to lube wrist pins and spiral locks were installed. GM oval port heads with com cams triple springs , push rods lifters, titanium retainers and Crane roller rockers. Intake is Edelbrock performer RPM with a matching Edelbrock Carb ( carb size to use ?). There is a Cloyes double roller chain & gears, a 292H Grind Comp Cams single pattern Cam .550 in lift. Your ideas good bad indifferent would be appreciated. Thanks.

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Old 02-23-2008, 06:43 AM
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Comp Cams triple springs? What are the specs on these springs-they might be to much for a hydraulic flat tappet cam. Are you sure this is only 10.5-1 compression with a .330 dome?
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Old 02-23-2008, 06:59 AM
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I believe they have a spring rate : 700 plus lift 304 @2.000" 681 lbs/in. coil bind:1.145. I'm not sure of that 10.5 to 1. There is a formula that i can use to check that Right??
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Old 02-23-2008, 07:24 AM
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Those are solid roller springs and they'll kill that little 292H in no time-so you need to change the springs. Look for springs that will give you 130lbs of seat pressure at your installed height and no more than 350lbs at .550 lift. Find out what your installed height is at now-it may be 2.00 or less.

There's online compression calculators available-I'll see if I can find one for you.
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Old 02-23-2008, 07:28 AM
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Here's a compression calculator: http://www.csgnetwork.com/compcalc.html

get all your measurements and plug them in and it should be fairly accurate
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Old 02-23-2008, 09:52 AM
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Is this a street motor or for a racecar? Why the aluminum rods??

From you cam & head selection, I can only assume it is not a full-on race engine.

I wouldn't run aluminum rods in anything other than a dedicated racing engine that gets torn down once or twice a season. They are not known for longevity.

If this engine is going in a street car and you want it to last, run a quality forged steel rod, quality lightweight pistons (the keith blacks are good) and get a good professional balance job. The engine will rev quick and the bottom end will be strong and reliable.
An engine with aluminum rods needs to be torn down to check the rods periodically for cracks. If they are OK, then cool, keep using them. These are usually used by racers to gain a weight advantage and quicker revving, at a cost of being far less reliable than forged steel. Most racers change out aluminum rods once or twice a season, just as a precautionary measure, because they know they are prone to failure over time. I know some people say you can run aluminum rods on the street, and some people have run them for years without checking them and without a problem, but really, do you want to take that chance? I would never run alum. rods in a street car. If you have alum rods in an engine for a long period of time and you don't check them, you are just rolling the dice every time you drive it.

This is just my humble opinion! If anyone reading this has aluminum rods in their street engine, I don't mean to bash you... its just one greasy dude's opinion on the subject. And the thread title wanted opinions.
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Old 02-23-2008, 12:19 PM
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i agree, aluminum rods are totally out of place on that engine. can you say "engine go boom???" and what is up with the "aluminum H beams"?? aluminum rods have a solid beam. i have never seen an aluminum H beam rod. better look again.
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Old 02-23-2008, 04:48 PM
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This was setup as a street engine. I think some of the information that was given to me has been in error ie alum H beam rods- can't seem to find them anywhere especially made by Milodon. I will have to pursue this a little further. When I get a chance to talk to the person for which the engine was set up then more than likely i will have some more questions for the experts. Thanks for all the help.
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