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#1 |
Registered User
Join Date: Nov 2014
Location: west coast, Wi
Posts: 534
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compression? hp? torque guesses (i do not know)
i own a 51 GMC. MII coil rear tremec 5 speed. it has (soon to be had) a 66 283. the 283 swallowed something no compression on 1 cylinder in each bank. i accuired an engine rom a club member..
here are its "STATS" 1978 vette 350 40 k miles stock bore stock stroke 882 heads .500 springs bronze guides ? 202 valves? eagle steel bem rods roller rockers double roller timing chain peed Pro H617CP Small Block Chevy 350 .275 Dome Hyper Pistons STD Bore 5.7" SBC summit cam 1104 the question is what would be the compression? whats estimated HP? estimated torque? can i cool it with my stock radiator? it did fine with the 283. |
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#2 |
Moderator
![]() ![]() Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
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Re: compression? hp? torque guesses (i do not know)
If you know the specs you might be able to get it here:
https://www.gofastmath.com/Horsepowe...wer_Calculator
__________________
Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
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#3 |
driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,720
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Re: compression? hp? torque guesses (i do not know)
With 882 heads I'd guess in the 300-340hp range.
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-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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#4 |
Registered User
Join Date: Nov 2014
Location: west coast, Wi
Posts: 534
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Re: compression? hp? torque guesses (i do not know)
they have been "worked" builder sauys over 9:1 with 2.02 heads.. cam is "small". builder estimated 400. i think that is being very optomistic. if it sounds like double the tired 283 i will be very happy.
i do not have it running yet i went ahead and ordered an electric fan. needed a different alternator bracket t stat housing. guages rebuild carb valve covers air cleaner. $$$ |
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#5 |
Senior Member
![]() Join Date: Mar 2015
Location: washington
Posts: 2,235
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Re: compression? hp? torque guesses (i do not know)
New illuminations of knowledge have descended upon Detroit's engineering laboratories, permitting fresh lodes of horsepower to be extracted from clean-burning, no-lead-fueled engines, which means that the new 1978 Corvette comes to the showrooms with as much as 220 hp available from the optional L-82 350-cubic inch power plant. (A respectable 185-hp — up five hp from 1977 — is packed into the base L-48 engine.)
882 castings are the old style "heavy weight", 76cc combustion chamber (port size is in the 160cc range) Note that the 882's came in both 1.94 and 2.02 intake sizes from the factory. An original 74 Z-28 LT1 had the 2.02 versions with screw in studs and guide plates from the factory. The compression ratio, with the dome you described, will be around 9:3. The head flow numbers could be improved with Vortecs. I'm not guessing at the HP. Cheers |
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#6 | |
Registered User
Join Date: Nov 2014
Location: west coast, Wi
Posts: 534
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Re: compression? hp? torque guesses (i do not know)
Quote:
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883 heads, roller rockers, summit 1104 |
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