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01-21-2020, 08:34 PM | #1 |
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Join Date: Apr 2019
Location: California
Posts: 53
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Smeding Performance 383 Extreme
So I have been Racking my brain for awhile with which crate engine swap should I replace my 307 in my 67 C10 Long bed, Did the internet search, Read alot of comments about different builders, (BTW you can't go by what some people say) So long story short, I just found out about Smeding Performance the other day, Call them today and was pleased with the conversation, I pretty much went with what I knew I needed all along, One change in plan was Carburation, i wanted to stay old school, but knew the benefits of the Holley EFI, So I went with that, Also wanted it to be turn- key, Ordered everything I need for that situation, Put my downpayment in and they will start on the build in three weeks, This will be a brand new GM block, The fact of the matter that they will do the break-in of the engine is a big plus for me.
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01-21-2020, 09:12 PM | #2 |
Senior Member
Join Date: Jul 2000
Location: North Texas
Posts: 3,536
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Re: Smeding Performance 383 Extreme
Pretty cool! I have a buddy with a turn-key Smeding 383 in a 55 Chevy car and he loves it.
What transmission, axle ratio, and tire height do you have? If stock, you might be better off with their 383 Cruiser. Also, are you good to go with a fuel pump and return line for the EFI?
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Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! Last edited by MikeB; 01-21-2020 at 09:35 PM. |
01-28-2020, 05:35 AM | #3 | |
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Join Date: Apr 2019
Location: California
Posts: 53
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Re: Smeding Performance 383 Extreme
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01-28-2020, 11:33 AM | #4 |
Senior Member
Join Date: Jul 2000
Location: North Texas
Posts: 3,536
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Re: Smeding Performance 383 Extreme
Probably no more than a 1000 miles, if that. The car's been finished for only 3 months. I'm not sure which version of the 383 he has, but I'll find out.
I was just saying that the one you ordered may be a bit much on the street. You'll probably want a torque converter with a higher stall speed. If the TH350 comes with a converter, check with TCI to see if it's optimal for your engine. They will probably want to know the camshaft specs at .050" duration. The truck should be a blast to drive, but even with 30" tires like yours, the engine will be spinning pretty fast at highway speeds with 3.42 gears. I once had a mild 383 in a 69 C10 with a TH350, 29" tires and a 3.08 axle. At anything over 60-65 mph, I was always wishing for a taller rear gear! 3.42 would have been a non-starter for me. Keep in mind that your 383 will probably make 50% more torque and do it at lower RPM than your old 307, which means it can pull a much taller gear and still accelerate much quicker. Depending on how often you drive at highway speeds, I'd suggest 3.23 maximum.
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Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
01-29-2020, 03:22 AM | #5 | |
Registered User
Join Date: Apr 2019
Location: California
Posts: 53
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Re: Smeding Performance 383 Extreme
Quote:
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01-29-2020, 11:42 AM | #6 |
Senior Member
Join Date: Jul 2000
Location: North Texas
Posts: 3,536
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Re: Smeding Performance 383 Extreme
Here are some calculations to determine RPM at road speed based on tire height and axle ratio. Use the one you like best.
http://www.wallaceracing.com/calc-gear-tire-rpm-mph.php http://www.advanced-ev.com/Calculators/TireSize/ https://www.reillymotorsports.com/sp...alculator.html
__________________
Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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