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#1
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How hard can a 360 rev?
Just built a short block with resized, balanced rods, ARP rod bolts, ARP main bolts, align-honed block, stock, ground crank .010/.010 under, Speed Pro 9.5:1 pistons with graphite skirts, had the '74 block dressed, cleaned, and machined at a local, reputable machine shop, Melling HV oil pump, hardened pump shaft, chrome moly rings, and on and on. My question is this, I build these SB MOPARs to pull, for trucks and such, and this is the most expensive setup I have built for a customer. The heads are ported with good bowl polishing, and smoothing the transition from the port to the bowl. The exhaust is opened way up, and the chambers are polished. He wanted it this way, but midstream, he chose a little different cam, an Isky that peaks out at 5500 rpm, and runs strong til 6 grand. Even with the ARP bolts, and the precise grind, will a stock-cranked 360 run out that far reliably? I said I thought he needed a steel crank, but I'd ask the wealth of experience here first. Thanks. PCRMike
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#2
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go 4 it
Small blocks like to rev,the only thing I would be concerned with is the oiling system,sounds like you did everything else,if its balanced correctly it should live.
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#3
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stock cast crank and resized rods should be good to 6500 without problems.
i use full groove main bearings in my 360, Melling HV pump and a Milodon 7 qt. pan. my engine has seen 7000 rpm with a comp xtreme hyd. cam. i ended up putting a 6600 chip in my msd box. Here's my engine: kb107 pistons block bored .030 align-bored, balanced, block decked 10.2 blueprinted comp. ratio comp xtreme hyd. cam 284/296 [240/246 at .050] .510 70* holley strip dominator intake holley 750 dp carb heads ported chambers polished bowls enlarged 2.02/1.60 valves full MSD ignition system Hooker headers mine has been running for three years now without problems. all it takes is some attention to details |
#4
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we run simular setup in circle track car and turn it 6800 every week but we have streched rods after 1 race season !!
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#5
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Thanks for the insight.
One more question, though. Have you ever blown the bottom end out of one, and how hard was it running when you did. Oops, two, are your rods stock, what about the bolts?
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#6
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my motor was an original 360 with the e-58 option. i think it used 340 rods and had a factory installed windage tray.
i personally have never blown an engine up. i do use ARP bolts in my motor. to me its just cheap insurance. |
#7
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If it can be vroken or smashed I am the guy to do it but I have never scattered the bottom end on a small block chrysler. I had valves hit pistons over 7000 and spun bearings at high rpms with low oil levels and crap like that. but as far as coming apart mopar small blocks just dont do it much.
Now chevy on the other hand should sell block patches for fixing the holes the rods make in the side. LOL |
#8
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Running a Comp Cam mechanical 255 @ 0.050 in my 360, ARP rod bolts, 645 rods, polished shot peened, cast crank, studs in the mains, factory caps, it's seen 7,000 rpm many times & still going strong
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#9
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we race a pavement circle track car and thats tough on the eng ! we broke st recond rods at the end of the year 1st season ! used new rods next yr and broke them right at the end of that season then we put in a set of eagle rods and ran them 2 seasons and started the 1st race of 3rd season and broke them ! but on the street would probally last forever if taken care of !!
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#10
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Re: Thanks for the insight.
Quote:
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#11
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We turn the circle track engine 8000 and it only broke after two seasons when a retainer broke and dropped a valve. That caused major damage at 8300 RPM but the good news is that the intake and timing cover were still useable. I feel that internal balancing has helped our engines live. Good Luck.
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#12
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I agree, an internal balbance on a high rpm race 360 is a must.
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