RPM engine vs Rebuilt engine

Sy#1991

New member
Would it be cheaper to purchase a rpm short block or rebuild a stock block? For the stock block thinking about doing stock crank, rods, pistons (maybe cryo treated) with 4 bolt main. Would a stock oil pump be good our the high volume pump be better? Double roller chain necessary? Also maybe l35 heads with the runners cleaned up a little. All comments welcomed thanks.
 

Turbotoyz

Member
Re: RPM engine vs Rebuilt engine

I'm not a guru, have had 4 Tys and one Sy, never long enough (or just fortunate) to have to rebuild any of the engines. But with all the posts over the years, all the complaints, flames etc why if you had it open would you go with stock? I think i read the stock rods have a tinsel strength of a "wet noodle." I'm not suggesting you do some radical build, but why not just upgrade at least to the next best thing and have an engine that will last longer? Just an idea. I haven't priced anything lately, so I wouldn't know the difference in cost of stock vs an upgrade. Have you priced the difference between building your own with stock internals vs buying one from RPM? Maybe the difference could afford you a little better internals if you did it yourself? Is this a "want" or did your truck make this a "need?" Just questions in my brain, that's all.

If its just a cost thing I get that. In my father and brothers experience they can and have built better motors themselves for less than or the same as others offered for sale. I'm not shooting down RPM, I'm not sayin' that my dad and brother can build a better engine than anyone else here on the board. I am simply stating that there are always alternatives.
 

Icarus-54

Donating Old Member
Re: RPM engine vs Rebuilt engine

Stock crank-cyro treated is good.I'd ditch the stock rods and pistons for a set of later L-35 rods(cyro'd) and forged pistons(srp's).L-35 heads cleaned up are allways a plus.
 

qbnkiller

Conflaguration Specialist
Re: RPM engine vs Rebuilt engine

it really is a personal decision. some people do not have the knowledge/expertise to build an engine. some ddont have the tools for all the assembly work. RPM, like any other shop has to make a profit - especially working in California.

You pay for the convenience and knowledge. If you have the time and capacity to do it yourself, I would recommend it highly. I got tired giving my hard-earned money to others whom didnt have my best interest at heart (as well as terrible engines). I took the plunge and built my first syty engine in 2008/9. I have since built more than a few for others here, and I personally enjoy it.

just my two cents worth!

EDIT: my above comments about terrible engines are NOT to be pointed at RPM, as I have never bought an engine from them. Just what has happened to me personally, and all five engines were built within a 100 mile radius of where I live in Michigan.
 
Re: RPM engine vs Rebuilt engine

Anyone have any experience with a RPM stock performance short/long block? I'm kind of in the same boat. Making the decision between someday (distant future) having 6 grand for a motor, or someday (sooner) rebuilding the bitch that's already in there...

Qbnkiller, the engines you've built..were they for stock performance? (300-350hp-ish)? and around what did it end up costing in the end? Just so i have some numbers to make a comparison, because shipping a motor from cali to nj would be crazy and then i'd really never get this truck done without a winning lottery ticket...
 

dgoodhue

BuSTeD 4.3
Re: RPM engine vs Rebuilt engine

The first weak point of the stock short block are the pistons and rods, so you want to do those first before anything else (cryo treating or 4 bolts mains).

As for the local vs a SyTy shop. If you have a trusted local rebuilder, you may want to use them. I am going to use SyTy vendor that I trust when the time comes for a rebuild.
 

Sy#1991

New member
Re: RPM engine vs Rebuilt engine

I'm sure this has been asked before but can i just get a l35 block and use a sy/ty crank and cam? And should a high volume oil pump be used?
 
Re: RPM engine vs Rebuilt engine

Anyone have any experience with a RPM stock performance short/long block? I'm kind of in the same boat. Making the decision between someday (distant future) having 6 grand for a motor, or someday (sooner) rebuilding the bitch that's already in there...

Qbnkiller, the engines you've built..were they for stock performance? (300-350hp-ish)? and around what did it end up costing in the end? Just so i have some numbers to make a comparison, because shipping a motor from cali to nj would be crazy and then i'd really never get this truck done without a winning lottery ticket...

$175 tops for shipping. Any higher than that and they're bs'ing you, unless it's to a residential address and they have to bring a truck with a lift gate on it. That up the price another $50 or so. When I was looking for an engine for my Blazer, that was the cost I saw repeated the most.
 

dgoodhue

BuSTeD 4.3
Re: RPM engine vs Rebuilt engine

I'm sure this has been asked before but can i just get a l35 block and use a sy/ty crank and cam? And should a high volume oil pump be used?

Hi volume oil pump is not needed, our engine are not high rpm motors. L35 blocks are balance shaft motors. The crank and cam are not interchangeable.
 
Re: RPM engine vs Rebuilt engine

Well, the shipping cost is much lower than I expected, but I'm starting to lean toward a local rebuild as much as my better judgement tells me not to. This motor has been rebuilt about 2-3 times already, the last rebuild being done by a shop in manville with a bad reputation (done by the previous owner). But at the same time...If I went outside and turned the key, the motor would start right up right now in an instant, it just has no power whatsoever. So I'm thinking that it can't possibly be bad enough to need to replace with a whole longblock... The compression test shows bad compression in two of 6 cylinders. This must have been asked before, but what kind of money are we talking when it comes to a stock performance rebuild? I say stock performance instead of saying stock, because I notice people are bashing the stock parts here so I''ll of course be asking around and researching which parts different people would reccomend to use for a stockish 300-350hp build. I'm not looking for prostreet here, just a "reliable" daily driveable Ty with a little more power than what it came with. Which shouldnt be hard considering there's a 10 year gap between today and when these engines were first built, so there has to be some innovation and quality/durability improvement since 93. (Done hijacking this thread my bad)
 

e95 Ty

New member
Re: RPM engine vs Rebuilt engine

I would only get a new/rebuilt engine from a respected board member (I think there may be a few for sale) or get one from a engine builder that has a good reputation with turbo v6 engines.....Moretto Motorsportz (formally Campbell Automotive) and RPM both have great reps on this board and have extensive experience with SyTy builds. DO NOT rebuild your engine with stock rods or pistons.....Be like putting marbles in your engine....Do it right the first time and avoid headaches and wasted money.:2cents: Ask me how I know.....
 

Sy#1991

New member
Re: RPM engine vs Rebuilt engine

Thanks for all the replies, I am going to start the tear down in a couple weeks and see what I find. I still think I might have a bad exhaust valve due to the popping sound through the exhaust cross pipe on light throttle only.
 
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