Thread: 383 for towing a travel trailer

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Are the pro comp roller rockers any good?

1.5 3/8" CHEVY SBC PERFORMANCE ALUMINUM ROLLER ROCKERS

Ebay item 170323279475. They sure are cheap.

Originally Posted by jbright300

Are the pro comp roller rockers any good?

1.5 3/8" CHEVY SBC PERFORMANCE ALUMINUM ROLLER ROCKERS

Ebay item 170323279475. They sure are cheap.

Hi Jeff, yeah, they're cheap because they're manufactured in mainland China. Some of this offshore stuff is ok and some of it is not. Personally, I'd bid on this set of used Scorpions before I'd buy anything ProComp.....Scorpion is a premium product.....
Item number: 120408708198

Hey Tech What my 383 pull it got Stock TBI head with 190 In
200 Ex @ .050 .475 lift at 8.7 comp. Stock TBI intake and Stock Exhaust, Thank you.

Originally Posted by Racecar100

Hey Tech What my 383 pull it got Stock TBI head with 190 In
200 Ex @ .050 .475 lift at 8.7 comp. Stock TBI intake and Stock Exhaust, Thank you.

Yeah, I can do that for you, but the DynoSim requires some specific information in order to compute intelligently. If you could supply me with the flow figures on the heads, the CFM rating of the TBI and the opening and closing points of the intake and exhaust lobes of the camshaft, along with the theoretical lift of the intake and exhaust, I'll be glad to help you out.

Any chance you could run my Nova engine on the Dynosim?

1971 350, 2 bolt main, bored .030 over
TRW forged flat top pistons, 2 valve reliefs
882 heads 1.94 valves 3 angle valve job
Crane roller rockers
Comp Cams XE268H hydrailic cam
Edelbrock Performer RPM manifold
Edelbrock 750 carb.
MSD 6A ignition
Sanderson "Shortie" headers
stock Nova oil pump

If you need any more info, let me know.

Thanks

Jeff

727 in the cylinder, 76 in the head, 4 in the deck @ 0.020" piston deck height, 6 in the piston, 9 in the gasket, 8.65:1 static compression ratio.

RPM HP TQ
1000 40 212
1500 84 293
2000 123 324
2500 159 334
3000 211 370
3500 260 390
4000 298 391
4500 328 383
5000 356 374
5500 359 342
6000 346 303

Tech with all this info and #'s You Have . I sure would Love to see you build an Engine and Run it on Line For us ?

Wow, those numbers are EXACTLY what the guy at the machine shop estimated the HP numbers would be when I was building this motor! All this in a 2700 lb. car makes it a blast to drive. Thanks!

Jeff

Well, I'm FINALLY ready to start my 383 project. Unfortunately, the money just isn't there to build my 383 this year, so I decided to put all of the same parts I was going to use on the stroker motor into the 350 that is in it. I pulled out the stock 1974 2 barrel, 175 HP 350 motor that has 56,000 miles on it and pulled it down to the short block. Confirmed that it is a 4-bolt main. I could still see some factory hone marks in the stock cylinders and decided to leave it alone for now. I pulled a couple of rod bearing caps and main bearing caps and found the mains to be good. The rod bearings looked somewhat bad, so I replaced them. I bought a new Melling stock oil pump and put in a steel oil pump rod. I put the Comp Cams 12-238-2 RV cam in 2 degrees advanced. I found a set of 1971 LT1 487 casting number heads on Craig's list and put all new springs, guides, seats, retainers, and keepers in them. I had the machine shop do some basic port work in the bowls and shave off .020. I am using an Edelbrock Performer RPM intake and a 600 Holley carb. I couldn't afford a set of name brand roller rockers, so I am going to try out the cheap Chinese ones I got on ebay for $100(Cringe).

My Desktop Dyno says 332 HP and 431 lbs. of torque at the engine. Not the most impressive numbers, but it it a huge improvement over the stock. The low compression is not helping the numbers, but I won't have to buy premium gas all of the time.

I ran the engine on the engine stand for a couple of minutes just to make sure everything is working correctly and it runs great! It has 50 lbs. of oil pressure at idle and a noticeable lope.

Biggest thing about your build to pull your travel trailer---1/2 ton pickup doesn't have brakes, springs , load carrying capacity ----

My travel trailer isn't a big one, 25', 4700 lbs., 470 lb. tongue weight. Also, one of the options on this truck was the heavy duty rear springs. I pulled it once with the stock engine last summer and it did fine, just didn't have much power climbing up any hills. If I had a trailer like my best friends, 8900 lbs., I wouldn't have bought this half ton pickup for the reasons you stated. Next year, I'm going to do a TH400 changeover to seal the deal.