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468 vs 454 vs 502

Old 12-19-2002, 09:49 PM
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Default 468 vs 454 vs 502

I am considering a 468 motor from totalamp

But I am not familiar with that particular cubic inch.

I have a 454 and know a bit about a 502.

Why would one be better than the other?

or is it not so cut and dry -- assume good parts on all three motors why would one be better than the other?

do cube's always win out?

I don't see much info here on the 468

any help is appreciated!

thanks!

Mark
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Old 12-19-2002, 10:35 PM
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Mark,

All three--- 454, 468 and a 502 normally have the same 4" stroke. All a 468 is, is a 454 that has been bored out .060" over. A 502 is basically a 454 only with a larger (4.470" I think) cylinder bore size which really starts unshrouding the valves and thus starts making some decent horsepower. The 502 requires a different block that has thicker cylinder walls to accomodate the larger bore size required to make it a 502" engine. They are usually refered to as a siamesed cylinder wall block. A standard 454 block cannot be bored out to the cylinder bore size of a 502, but it can be bored out safely to a 468" engine. Again, each of these engines 454, 468 and 502 all use the same 4" stroke crankshaft and the same rods. The only difference between the 3 are the piston bore sizes. If your wallet can swing it, buy the 502. Hope I have expained it well enough for you.

And remember, there is reliability in cubic inches. Best wishes

Mark/KAAMA

Last edited by KAAMA; 12-19-2002 at 10:41 PM.
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Old 12-20-2002, 07:30 AM
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thanks -- that does help


after i thought about it a while -- i figured the 468 was a bored out 454.

its a good deal on the motor
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Old 12-20-2002, 08:33 AM
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this is part of the spec i have received

what else should i be asking?


468c.i. engines. Just built 5 hrs. Forged SRP pistons, steel crank and rods. oversize Gil Offshore oil pans,Merlin heads, Dart aluminum intake and Holley Marine carb.

making 525hp
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Old 12-20-2002, 08:34 AM
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mpejsa/Mark,

Also, if you have the engine torn down to have it rebuilt you may consider having the cylinders "bore notched". This will give you about 25-30 additional torque and HP. It's cheap reliable power.
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Old 12-20-2002, 08:44 AM
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Originally posted by mpejsa
this is part of the spec i have received

what else should i be asking?


468c.i. engines. Just built 5 hrs. Forged SRP pistons, steel crank and rods. oversize Gil Offshore oil pans,Merlin heads, Dart aluminum intake and Holley Marine carb.

making 525hp
Mark, Well, not knowing who assembled it or how it was assembled or how it actually runs, by what you're saying it sure sounds as if there's A LOT of sweet parts in there. If it's in the price range you're looking for it may be a good buy. Have you seen/heard this engine run?

Also, what kind of exhaust system do you plan to run?
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Old 12-20-2002, 08:48 AM
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I have not seen the engine yet -- it is by totalmp -- in louisana

I currently have stock "log" exhaust and am looking to upgrade that also.

It is a good price on the motor - and he'll buy my 330 off of me.

I am mechanically inclined -- but do not know the ins and outs of what parts are good with what.

I guess what I am also saying is I am trying to find out how totalmp (aka stephen at total marine performance) is known -- as far as engine building goes.
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Old 12-20-2002, 08:57 AM
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Mark, I haven't heard anything bad about Total MP. What you might want to do is go into the "General Discussion" area and let post it on there that you're considering buying a used engine from Total MP and ask if anyone has delt with Total MP good or bad, and see what kind of responses you get. I know a few guys have delt with them and it been good, but I don't know of their engine building practices or how they deal with people when it comes to used parts.

Mark/KAAMA
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Old 12-20-2002, 08:59 AM
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thanks mark -- i'll do that

its hard to word it in a way as to not offend Total MP -- but i want to do my due diligence also.
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Old 12-20-2002, 09:36 AM
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Mark, you are a consumer and that is one of the BIG things of what this forum is about and yes, wording it in a way as to try and not offend would be a wise thing because I think you know that things can get out of hand on here real easy.
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