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#1 |
Registered User
Join Date: Apr 2008
Location: Cale, Arkansas
Posts: 29
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Good Engine Advice Needed.
I am planing on building a 350/700R4 combo for my 72 LWB. Plans are Edelbrock Perfromer cam and intake, 600 cfc carb, vortec heads, long tube headers. Current gears are 3.73 but plan on 3.42. This is going to be a daily driver. Any guesses on power and mileage? How big a headache is it to do the tranny swap? Thanks
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#2 |
Registered User
Join Date: Apr 2007
Location: King City, Ontario, Canada
Posts: 974
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Re: Good Engine Advice Needed.
its really hard to guess power without cam specs. same with mileage. but with just a mild cam, and all that gear, you might be closing in on 15-16 mpg, if your lucky.
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- Jason If you can turn, Youre not going fast enough. Favorite caption: first car to 200 mph in the 1/4 mile, no parachute, drum brakes all the way around.. ..back when men were men. |
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#3 |
Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
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Re: Good Engine Advice Needed.
15 to 16 mpg sounds about right.
It also depends on your driving habits and high tall your tires are. I don't know anything about 700R4 swaps, but I am sure some one that has done one will chime in soon. Danny |
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#4 |
Registered User
Join Date: Apr 2008
Location: Cale, Arkansas
Posts: 29
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Re: Good Engine Advice Needed.
Planning on 275/60R15's 26" if I remember right.
Last edited by 2ndCIB; 04-22-2008 at 04:36 PM. |
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#5 |
Jamie Hyneman is my twin
![]() Join Date: Nov 2005
Location: La Junta, Colorado
Posts: 705
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Re: Good Engine Advice Needed.
700R4 swap will need a crossmember change for sure. Your drive shaft should stay the same, and even your yoke.
Speedo converter? Detent cable?
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Justin SOLD 1967 K10 Fleetside, 283, Front and Rear Posi SOLD Color Wiring Diagrams Now in High Resolution V8 and Cab and Cab and Chassis |
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#6 |
Registered User
Join Date: Apr 2008
Location: Cale, Arkansas
Posts: 29
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Re: Good Engine Advice Needed.
UMMMM.... Forgot about those things. Adding them to the list now.
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#7 |
Registered User
Join Date: Feb 2007
Location: Cali Central Coast
Posts: 5,191
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Re: Good Engine Advice Needed.
3.73's are still a very common rear end in the brand new Chevys - the mileage will come from the tranny.
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'67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD ![]() Click here to support the board Philippians 4: 6-7 |
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#8 |
Senior Member
Join Date: May 2002
Location: NORTHEAST OHIO
Posts: 493
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Re: Good Engine Advice Needed.
I can't imagine seeing much difference between the 3:73 and the 3:42 gears.If the 3:73 is in good shape,I would spend the money elsewhere.
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#9 |
Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,815
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Re: Good Engine Advice Needed.
Milage sounds right - I'd agree with Dan42 that the tranny will give the milage.
For power, I had something close to this engine already built in DD - figuring the CR at 9.1, I came up with 320HP@4500 RPM and a great torque curve with > 400 TQ available from 2000 - 4000 RPM. More complete information (in the Engine section, probably ![]() |
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#10 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Good Engine Advice Needed.
if your truck had the original shorttail th350 you'll need to shorten driveshaft use the same crossmember just move it back in the frame(holes are already drilled) you might need a longer speedo cable available at autoparts storethen you need tvcable and mounts as well as the lockup kit//its not that difficult of a conversion once you have parts/save the 373 and if you want to spend money in the rear get a posi and new seals
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#11 |
Registered User
Join Date: Oct 2007
Location: Sykesville MD
Posts: 357
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Re: Good Engine Advice Needed.
i would leave the 3.73 's for now, i did a 700 conversion a while back, 3.73's were awesome, off the line quick and could cruise at 80mph no prob. your speedo cable will work, the dust cover will work from a 350, the "detent" cable is different for a 700 its called a "TV cable", i believe the dipstick tube is different as well. i agree with cdowns, you need the lockup kit so the lock up converter will engage and disengage at the right times. you will also need a carburetor geometry correction kit. it is very important that you get the tv cable adjusted properly, since it controls line pressure and shift points, if this is done wrong your trans may only last a few months.
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'55 3100 2nd series short-bed stepside '70 Corvette coupe stingray '71 Chevelle 2-dr coupe SS clone '71 C10 long-bed fleetside '83 long-haired brunette wife |
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#12 |
Registered User
![]() Join Date: Aug 2005
Location: Philly
Posts: 1,140
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Re: Good Engine Advice Needed.
I agree with Chris. Everyone I've spoken to says the 700 likes 3.73 or 4.11 gears.
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#13 |
Registered User
Join Date: Apr 2008
Location: Cale, Arkansas
Posts: 29
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Re: Good Engine Advice Needed.
Now thats what I'm talking about! Thanks Billa, thats the power I was wanting. I think I will keep the 3.73'. My wife really likes it when her head bangs off the rear window at every stoplight!
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