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#1 |
Registered User
Join Date: Nov 2014
Location: Amarillo, Tx
Posts: 6
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Mild 350 sbc build, what do you think?
Ok so I have just acquired a 1972 GMC C15 long bed fleetside. I want to do just a simple restore job with a focus more on comfort than a fancy paint job or hot rod motor. I do however want to add a little extra power and a few more mpg out of it. So after some research I wanted to throw my idea on how to set this up out there and get some of your opinions. So here it is, I'm going to take the stock motor with all the lower end being factory spec, and put a COMPCams 252he cam with the new valve train and all to match. Then take the stock intake manifold off and put on an edelbrock rpm intake with the stock quadrajet. Leave the stock exhaust manifolds on and put a b&m shift kit in the TH350 tranny. I'm only looking to get around 25 more horse and maybe 2-3 mpg more out of it. Compression will be stock, which I believe is 9.5:1 may be wrong I'll have to double check. I think that covers everything so any tips or advice would be helpful thanks.
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#2 |
Registered User
![]() Join Date: Apr 2014
Location: Eugene, OR
Posts: 51
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Re: Mild 350 sbc build, what do you think?
I would consider exhaust too.
__________________
'70 2wd swb, 406 sbc, air ride and a big smile on my face! |
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#3 |
Registered User
Join Date: Sep 2013
Location: United kingdom
Posts: 127
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Re: Mild 350 sbc build, what do you think?
personally with that cam i would go with a performer manifold over the rpm, as that cam will not the rpm up top.Exhaust would as mentioned be a consideration as well. have you looked at there 260 cams ? pull well and a little more rpm.
__________________
GMC K1500 1971 350 cu in th350 4wd Bondo Bob c 10 1971 stepside th 350 c10 1970 350 cu in manual air con stepside. |
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#4 |
Registered User
Join Date: Nov 2014
Location: Amarillo, Tx
Posts: 6
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Re: Mild 350 sbc build, what do you think?
Yeah I am looking at exhaust just forgot to to add it to the list. I'm looking at going with true dials. After looking back over my parts list and the edelbrock site I'm definitely going with the performer. I had one on one of my old grandwagoneers and loved it. I want the rpm range of the 252 I compared the two and the 252 is in the rpm range I'm wanting.
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#5 |
Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,280
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Re: Mild 350 sbc build, what do you think?
I would consider the 260h. I have used the 268H in many cases and it has never let me down. Even going with one that far from the stock spec it helped the motor run so much better in all cases it got better gas mileage. and power boy howdy!!the expectations you have are fine if not just a little low but being low is ok so your not disappointed if it doesn't do great, but it will. Jim
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#6 | |
Registered User
Join Date: Nov 2014
Location: Amarillo, Tx
Posts: 6
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Re: Mild 350 sbc build, what do you think?
Quote:
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#7 | |
Registered User
Join Date: Jun 2014
Location: Glendale, Arizna
Posts: 1,642
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Re: Mild 350 sbc build, what do you think?
Quote:
Regardless of head use the fel pro steel shim 1904 gaskets to enable quench in the combustion chambers. Those dish piston engines with that size cam just love smaller combustion chambers like the double humps. For $399.00 you can get these rebuilt 65cc heads, they are likely rebuild 305 castings they have new bronze wall valve guides, stainless valves 1.94"/1.5" valves with new springs that will more than handle your cam. http://www.aeroheadracing.com/chevy.html Do you have dual exhaust? I think that engine would like dual exhaust with a crossover pipe. Stock single Y pipe is very restrictive with bad reversion. Ensure a good distributor on it around 24' mechanical timing at around 2500 RPM (more or less depending on heads and cruise RPM best to have all in at highway cruise for mileage) with about 18' adjustable vacuum advance hooked up to ported. If it pings then set it back as nec. This should get out of it all it has if the carb is set up right. If it's the original quadrajet with the divorced choke, a new aftermarket manifold will cause problems with that. Edelbrock 7104 Performer RPM quadrajet manifold. http://www.summitracing.com/parts/EDL-7104 It offers a special choke rod to accommodate the divorced choke, Edelbrock #9172. http://www.summitracing.com/parts/ed...GoWxoCixnw_wcB If Vortec heads interest you, let me know I'll tell you what you need. |
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#8 |
Registered User
Join Date: Jun 2010
Location: San Diego Co.
Posts: 1,193
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Re: Mild 350 sbc build, what do you think?
subd.
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1972 Chevy C-10, SWB, Fleet, 350/350, PS, PB, HEI, mostly stock, Survivor. ![]() |
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#9 |
Registered User
![]() Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,626
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Re: Mild 350 sbc build, what do you think?
If I were to do that to my truck I would go with Xe256/vortec heads/ performer manifold
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1969 ![]() 1950 Chevy Wagon 1978 Big 10 1967 C10, 250,3-OTT |
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#10 | |
Registered User
![]() Join Date: May 2013
Location: WEST PALM FLORIDA
Posts: 1,174
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Re: Mild 350 sbc build, what do you think?
Quote:
performer manifold fits your desires , rpm is more a street strip manifold for higher """rpm"""
__________________
68 Long Fleet , ly6 , turbo 350 , 3-5 drop , original paint , front discs 67 Small window , 7 foot bed , tweaked 6.0 LSX 2004R Medium Olive 58 Apache fleet , 235 , offy intake , dual exhaust , 4 on the floor , red/white 69 Long Fleet , Custom , 6.0, 4l60 , AC , Medium Olive |
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