I'm building a tight budget small block, this is what I have so far. Summit K1102 Cam, DZ 302 Heads and Intake, Summit 600CFM Intake, 1986 LT9 350 Block. In the end this going to total less than 1000 bucks. What kind of power should I expect? Obviously this won't be monstrously powerful but I plan on focusing more on handling than power anyway.

 

220??? K1102 is very mild. Those #186 heads made decent power on the SBC 302 but with a huge solid cam and freeflowing exhaust. Oh yeah and HP ratings back then.. you can take about 25% off the top of that rating atleast. Should be a decent setup though I ran similar #041 closed chambered heads and a K1105 cam I think and it was a great street performer in my 82 Z28 went 13.2s

 

The block is irrelevant to power potential. Survival at some arbitrary level, maybe; output, no.

What will matter the most will be the compression, which is largely determined by pistons, deck clearance, and chamber volume; head flow; and the cam.

Tell us what pistons you are using, the ACTUAL MEASURED AS-BUILT deck clearance, the head casting # since as we all know nobody wants those old heads so they give them away because a numbers-matching DZ302 is of no interest to anyone, and the level of detail you are willing to apply to this build. (a BOM alone doesn't guarantee any particular power output)

 

Depends on many variables. But in the 260-320 hp range if it is fresh and built properly. Aka not suffering from poor ring seal, pistons way down the bore, thick rebuilder type gead gaskets, has a decent exhaust and suitable air cleaner, etc.

 

Sorry I just realized there was a typo. I meant the K1103, I haven't checked out he K1102 so I'm not sure if the K1103 is any better. We're going with stock internals, which means 8.3:1 compression.

 

Except that 302 that was rated 290 hp at 5,800 made more like 360 hp @ 6,800 with headers. I have seen some testing back in the day that ran into the 12s in a 69 Camaro with a stock 302 long block.

 

Actually it won't be 8.3:1. The older camel hump heads have 64cc chambers compared to the 76cc chambers on the 1-ton truck/van LT9. Compression should be around 9.3:1.

 

I had a L05 TBI 350 out of a G20 van that I put the Mellings equivalent of the K1102 into it, the MTC1. 52cc 601 305 heads. Headers and added a TBI intake on top. Had it in my 83 G20 van. Made 255 RWHP and 340 RWTQ through a 700r4, 2 piece drive shaft with carrier bearing and GM 9.5" 14-bolt. I figured about 22% loss through that driveline turning the accessories and clutch fan. Making the engine about 325 hp and 435 tq at the crank.

 

At this point, the "DZ302" claim is BEYOND SUSPICIOUS.

Kind of reminds me of one time early in my SBC career. I was looking for a pair of decent heads to replace the 327 2-bbl crap that came to me on this motor I had, and a friend told me a friend of his had some heads out of a Vette for sale, so I went to see. I went to his house, and way back in his back yard, was the remains of a wrecked early 60s Vette. He opened the door and took a pair of heads … out of a Vette … and handed them to me. Turned out they were 283 heads. I remember another time a friend said he had the opportunity to buy a pair of "LT-1" heads from a 70 Vette; he came back with a pair or 624s, and told me the guy told him he salvaged them after he had scrapped the car because it had a bad body rust problem and the fenders were gone. Oh yeah, that was the year Vettes had all that body rust. Yeah right. I helped him get his money back from the scammer... back in those days it was easier to make people offers that they couldn't refuse.

Moral of the story is, any time somebody makes some preposterous claim like that, they're USUALLY (but not always, of course... there's still the .0001% chance that it's true) repeating some kind of previous-owner used-car-parts-seller drivel and lies, that were part of the lipstick they put on the pig to make the unsuspecting or unknowledgeable buyer separate himself from his money.

The rules of buying used parts seem to be:
.

1. How can you tell the seller is lying? His lips are moving. How can you tell that he's EFFFFing you in the rear? He's smiling.
2. If you can't PROVE INDEPENDENTLY whatever the seller is claiming, either by seeing it with your own eyes or by some other un-fakeable method, IT IS A LIE. Not a "joke", not an "exaggeration", not a "hypothesis", not a "mistake", not even an "assumption"; it is a deliberate, intentional, and outright LIE.

In this case, if the OP didn't SEE WITH HIS OWN EYES the seller PHYSICALLY UNBOLTING the heads from a TOTALLY UNMOLESTED DOCUMENTED numbers-matching DZ302 Z28, then Rule #2 CERTAINLY applies. And while I wasn't there at the moment, I'm pretty sure that the 1st half of Rule #1 applies, and I can only guess about the 2nd half of Rule #1 but somehow I don't feel all fuzzy about it.

Yes I have "trust issues". After trusting one time too many, I'm now hard to fool.

And of course, the results anyone else "claims" for any particular Bill Of Materials, is TOTALLY IRRELEVANT to whatever "build" anyone else is doing. What "Fast355" claims his van motor did (it's always a van... motors make more power in those) bears NO RELATIONSHIP WHATSOEVER to the outcome of the OP's project. It is senseless to pay any attention to it.

 

My point was more how to build compression on that 350 bottem end as well as the fact even though that cam is mild it can still build power. It a hotter grind than the GM 300 hp 350. I have always just driven Vans. Or trucks or Tahoes.

 

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True that engine was under rated and I've heard it from people who drove them that they bumped 12s. But...VERY aggressive solid lifter cam and certainly different drivetrain all together. We are comparing Apple's to Oranges. Those #186 heads used in the 302sbc were used in a variety of engines in different sizes in different years. Decent yes, should make for a good street engine with a K1103. I used that particular cam on an LG4 and it picked up some power along with headers added a full second 1\4 although still a bit slower than my stock LB9 car i bought a few years later.

 

Yeah back in the late 70s, early 80s, I used to visit the junkyard every month or 2 looking for cars with 186s and 492s. They were by far the best and most common stock castings to build out of, along with 041 which was not near as common. Typically found em in Impala and Caprice, especially station wagons. Can't recall ever seeing a Z28 sitting around with its motor intact and available for picking though. I couldn't afford to go to the stealership and plop down the long green for 292s so it was all junk for me.

Even if 186 had been one of the castings used in DZ302s, which I don't think they were (seems like they were still using no-bolt-hole castings on those, at least in 67 & 68), that doesn't automatically make every pair of 186 castings into "DZ302" heads. Any more than every 350 block is automatically "out of a Vette".

And of course, besides dropping a buzzword, the OP hasn't told us what castings he ACTUALLY has; or any of the rest of that stuff that has such a YUUUUUUUUUUUJJJJJJJJJJJE effect on power output.

 

All this talk of DZ 302 heads and Corvette 350s made me remember a dyno test I saw of recreations of the DZ 302, the 365 HP 327 and both a 1970 and 1971 LT-1. Believe it or not the lower compression 71 LT-1 with open chamber 487 heads made the most peak HP closely followed by the DZ 302. The 327 was also not far behind.

http://www.caribbean-joe.net/vette/sbtest-1.htm

 

Indeed... all of those were hella good motors in their day, given the constraints of the times they were born into... I guess we'll have to wait and see what applicability, if any, any of them have to the matter at hand.

 

Eh...dont get wrapped up about dz this or camel hump that those parts werent all that great
Worked in a place in the 80s that restored those....without a 4.56 gear those Zs sad to say were pigs...they had absolutely ZERO torque.