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#1
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advice for 360 build
Hello all. First I'd like to say great board, lots of goot information! Anyways, I'd like some advice on my first 360 build. The motor is .030 over, I will be installing KB107's with reconditioned and bushed rods, X-heads with a healthy port job on the exhaust side and mild port work on the intake side, 1 5/8" headers, Performer RPM intake, Holley 750 vacuum sec, and Crane 1.6:1 roller tip rockers. I plan on using an MP 268/272 .450/.455 cam because I allready have it from another motor. The car is a 72 Duster, 904, MP 175K converter, and 4.30 gears. If traction is available, would high 12's be out of the question with that cam? Also, are there any mods to the oiling system I should be aware of?
Thanks Chris |
#2
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i'm not the final word, but that cam is way small to be matched to 430 rear gears, and that cam profile probably won't even benefit much from headporting. with 430's i'ld be looking at the mp"509" or something a little bigger. that makes a not to streetable combo. good luck.
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#3
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Agreed
The cam is waaaaay small for the times and gear.
The purple 292 should be considered a base cam for this endevrer. Fellas here have run mid to low 12's with that cam and very simalar combo. Skip the old cam for a new unit. No oiling mods needed at this point. seldom , if ever really. |
#4
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Here's how I have the 360 built in my # matching '79 Aspen R/T:
Reringed with moly rings, stock bores and pistons/rods/rod bolts. Tri-Metal main and rod bearings. Factory E58 windage tray, double roller timing chain. Ported stock 360 "051" heads (1.88"/1.60"). 7.70 MEASURED (CC'D) compression ratio. Orange box electronic ignition conversion. Comp Cams XTreme Energy 274 cam. 150 psi on a compression test. Best times come from shifting at 5500 rpm. I tried higher and lower shift points, and 5500 was the best. It has a rough idle on the street, but runs nicely at anything above an idle for me. LD-340 intake, 850 TQ #6322S carb. Hedman Headers to a dual 2-1/4" exhaust system with Flowmasters 2500 stall factory 340 converter in a non-lockup 727, 3.90 Sure Grip in the 8-1/4" axle. This car runs 14.50's at 93-94, and the HP calculators say 255 net hp, 238-240 rear wheel hp. that's at 3720 lbs with me in it, and tools, spare tire, 1/4 tank of gas, etc. Needs new leaf springs and new tires. Although everyone says to raise the compression for maximum hp, if you're going to drive the car every day I'd suggest keeping the compression to 8.50 or less. I run 87 octane in my Aspen R/T all the time and it never pings. Some work at the dragstrip showed that 38 degrees was the best timing setting. I'd tried 33,36,38,40, and 44 to come to that conclusion. MP cams are obsolete, although you'll find many people who won't use anything else. I'd suggest a Hughes or better yet, an Ultradyne cam. It'll be tax refund time in a couple months, reserve some cash now for a new cam. |
#5
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Yup, the cam is too small....
.... and like everyone else, I'd go with something that has .490" to .510" lift.
As for oiling system mods, just make sure you have a 90 degree oil filter adapter and a bigger oil pan and you're all set. By the way, did you port those heads yourself? I've been looking for a template but no luck so far..... |
#6
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Thanks for the replies. I figured it would be on the small side, but I wanted some confirmation. I don't think I have quite enough converter for the MP 292 cam, but I'll probably look for something in the 230-235 degree @ .050 range.
I've done some light porting on the intake side, primarily in the guide boss and pushrod pinch areas. The exhaust was done allready. Thanks |
#7
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Chris,
If you REALLY want to run that camshaft, move up to a 3.91 gear set. The rest of your combination sounds great! With the right amount of head work, you will be in the high 12's with the 3.91's. I'm running the COMP XE268 (.224/.230 @ .050) with pocket ported original "J" heads, cast iron intake and exhaust manifolds a 2200Rpm converter in a A/C Duster 340 that weights 3500Lbs @ the track. I've run a best of 13.59 @ 103.41Mph with 3.55's or a 13.39 @ 103.54Mph with 4.10's. Since you have less weight (No A/C, about 75Lbs) better intake and headers, you better be in the high 12's! |
#8
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hey Y 8, what compression ratio are you running ? i've got kb107s
and with my setup i'm running 10.2 to 1. Have you looked at the comp xtreme energy series ? i'm running a 284/296 .510 70* hydralic. with auto and 3200 stall i've went 12.69@107.43mph i like the comp cams |
#9
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You are already running .480 lift or better, with the 1.6 rockers you have.
That in mind, I think this is a good cam, although I don't know how anyone can give cam advice without knowing what compression ratio your running. It's a great cam at 10:1, too much for 8.5:1 and not enough for 11:1 or better. |
#10
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Thanks for your input. Compression will be right around 9.4:1 with 72cc chambers. Do you guys think I'll be on the edge of detonation with the relatively short 268 total intake duration? If I use this cam I'll probably install it straight up. I'm also thinking about trying the MP .484 cam with the 114 degree lobe displacement angle for a better idle. The car will pimarily be street driven. Thanks
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