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11-17-2014, 02:13 AM | #76 |
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Re: Urgent, need opinions on my new crate engine
The 350/330 HP Deluxe is what I have in my 69 C20. I think you'll like it. I've only put about 250 miles on mine So, to some extent the jury is still out.
Read mechanicalman's post #69 carefully as he's pretty much covered everything I learned. It addition, the engine comes with a long water pump and a 153 tooth flexplate. You'll need to replace the pump with a short pump if you are running original pulleys. You may need to replace the flexplate with a 168 tooth version depending on your starter. If you want to run an original temperature sensor in the original location in the head (most folks have had problems getting one that reads properly), forum member brian mac machines the originals to 3/8" NPT. Here's a link with some discussion on this topic and his contact info http://67-72chevytrucks.com/vboard/s...d.php?t=627880. If you have factory A/C, in addition to the bypass mechanicalman mentioned, you will need to fabricate some brackets/braces to properly tie the top compressor to the intake/engine. I have pictures showing what I did and a pattern for one of the brackets if you need them. All other accessories should bolt right on. Incidentally, my engine came with a 670 CFM carb, not the 600 mentioned by Summit. There have been at least 4 different part numbers for this engine package. The earlier ones had the 600 and many sellers never updated the description as it evolved. If you want to run a steel fuel line from the pump to the carb, I can look in my file for info of what I found that worked with very minor tweaking. I THINK it was one designed for the 1968 Camaro Z28. I also have a phone number for a performance hotline that is staffed by very knowledgeable people if you need it. Edit: Additional thought. If you don't currently have an HEI distributor you'll need to replace the resistor wire that ran to the coil with a regular 12 gauge wire. Last edited by FirstOwner69; 11-17-2014 at 02:31 AM. |
11-17-2014, 02:57 AM | #77 | |
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Re: Urgent, need opinions on my new crate engine
Quote:
What about the front a/c bracket on the passenger side head? I assume it needs a hole drilled to match the different pattern on the Vortec head? After reading the link about turning down the temp sensor to 3/8 NPT, I'm wondering if the 3/8" temp sensor I recommended will work? It's made to GM spec, but have they changed the resistance spec over the years? It would seem the one for the idiot light would have to work but a possible problem on the gauge sensor. Probably best to turn the known good sensor down to the proper size and re-thread, as long as it does not machine through to the innards of the sensor. Or if the old sensor will screw into the intake manifold, I've done that before and it gives a good sample of the temp. |
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11-17-2014, 09:09 AM | #78 | |
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Re: Urgent, need opinions on my new crate engine
Quote:
I wound up getting the original type temp sensor and putting it in the manifold. It was off scale (I don't remember which direction), so I wound up searching on here and found where others installed an in line resistor to make the gauge read correctly. Apparently even the "correct" new temp sensors don't always play well with our gauges.
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11-17-2014, 09:36 AM | #79 | |
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Re: Urgent, need opinions on my new crate engine
Quote:
Really great info man! I really appreciate that. As for the sensor, I don't have gauges just the idiot lights.....do I still have this same sensor issue? Also, I was told the engine does not come with any water pump....I already have a brand new short high volume pump....I guess If it does come with one I can try to sell the long one...
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1972 Chevrolet C20 Cheyenne Custom Camper LWB - 350 / 330 HP GM Crate - TH350 / Mild Shift Kit - Dark Blue / Medium Blue - Paint Code 559 |
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11-17-2014, 10:02 AM | #80 | |
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Re: Urgent, need opinions on my new crate engine
Quote:
where does the thermostat bypass hose go?? Can you send me a picture of an example? Hopefully my mechanic will know all this already and I shouldn't have to say anything, but I will give him the heads up about the temp sensor and the bypass and see what he says then report back.....
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11-17-2014, 10:14 AM | #81 |
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Re: Urgent, need opinions on my new crate engine
You will definitely like the engine with vortec heads better. You made a solid choice. I look forward to hearing your thoughts after you drive it.
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11-17-2014, 12:55 PM | #82 |
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Re: Urgent, need opinions on my new crate engine
Here are 4 pictures that show the bypass, A/C intake bracket and 2 braces. The intake bracket is based on the original older style that was used on my 69. The front brace is similar to those used on the mid-60s cars. Doing the bypass in this fashion required a spacer under the thermostat housing.
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11-17-2014, 01:09 PM | #83 |
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Re: Urgent, need opinions on my new crate engine
Great engine choice, you will really like it.
Another option for your temp sensor, It's very easy to drill and tap the head or intake for your original or original replacement sensor. A well equipped shop can do this in about 10 minutes.
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
11-17-2014, 02:02 PM | #84 |
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Re: Urgent, need opinions on my new crate engine
A couple other comments.
I don't recall you saying if you have A/C with the heater shutoff valve. If not, I'm almost positive you don't need the bypass hose. In the pictures I posted above, you can also see the fuel line I mentioned in post #76. If you are still using the factory breather setup, you will probably have to slightly modify the "collar" where the breather hose attaches at the carburetor end. It caused the butterfly on my carb to bind. If needed, I can post a couple pictures a the very simple modification I made to the collar. Last edited by FirstOwner69; 11-17-2014 at 02:12 PM. |
11-17-2014, 03:46 PM | #85 | |
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Re: Urgent, need opinions on my new crate engine
Quote:
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11-17-2014, 04:34 PM | #86 | |
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Re: Urgent, need opinions on my new crate engine
Quote:
Let me break it down simple: You need coolant flowing from the upper part of the engine below the thermostat when the thermostat is closed to keep steam pockets from developing from stagnant coolant sitting still on top of the hot heads. ANY hose coming off the top of the intake going to the suction side of the water pump will keep the coolant moving and prevent steam pockets from developing. The heater circuit will do this, if you don't shut it off with a water valve. With no heater valve and coolant flowing all the time from the top of the intake through the heater core to the water pump (like you said it does )you do not need a bypass hose. I said that if you by-passed your heater core you could damage your engine, but now that I think about it that would be only if you plugged the hoses. If you looped the 3/4" outlet hose from the top of the intake (heater supply) and adapted it down to 5/8" and connected it directly to the water pump heater intake, that would be a good bypass system. So, consider not having a bypass hose but if you do carry a 3/4" to 5/8" heater hose adaptor in your glove box for emergency IF YOUR HEATER CORE BLOWS A LEAK. But if you ever add a/c, and install a heater valve (aftermarket systems do that), again you will need a bypass hose. The instructions HAVE to say you need a bypass hose and they cannot get into the complexities of a/c or no a/c. But the fact of the matter is, a heater running off the intake manifold to the suction side of the water pump IS YOUR BYPASS HOSE if flow is allow un-interrupted. Last edited by mechanicalman; 11-17-2014 at 04:36 PM. Reason: Add-on. |
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11-17-2014, 08:11 PM | #87 | |
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Re: Urgent, need opinions on my new crate engine
Quote:
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11-17-2014, 09:21 PM | #88 |
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Re: Urgent, need opinions on my new crate engine
Thats what I do. I drill one 1/8th" hole in the t-stat and haven't had any problems with my 383 stroker. It was recommended to me by a long time engine builder and has worked for him for many years.
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11-17-2014, 10:43 PM | #89 | |
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Re: Urgent, need opinions on my new crate engine
Quote:
Also on another note, this new engine comes with a holley 670 carb. I know Edelbrock likes 5.5-6 PSI of fuel max. Does Holley require a max PSI? I already had ordered a Edelbrock mechanical pump to use with the 290 HP engine because I was going to use my 1406 carb....would that still be a good fuel pump to use for the Holley or should I get another fuel pump? If so, suggestions??
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11-17-2014, 11:02 PM | #90 | |
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Re: Urgent, need opinions on my new crate engine
Quote:
http://www.autozone.com/fasteners/he...or/102831_0_0/ If you don't want it rattling around in your glove box, get a zip-tie and fasten it to one of the heater hoses. Yes, that would still be a good fuel pump. Last edited by mechanicalman; 11-17-2014 at 11:03 PM. Reason: add-on |
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11-17-2014, 11:44 PM | #91 | |
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Re: Urgent, need opinions on my new crate engine
Quote:
Cool deal, thanks all your help! Is this adapter something that could be used for the temp sensor?? http://www.zoro.com/i/G1040681/?utm_...m_campaign=PLA Also, I just found out that the engine http://www.summitracing.com/parts/nal-19210008 Comes with the intake NOT INSTALLED! Can you believe, for $4K and it's not pre installed....not a big deal if I was doing the swap myself, but my truck and the engine is at my mechanics shop and I can't go install it myself....so now I have to pay him to install the intake....
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11-18-2014, 02:39 AM | #92 | |
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Re: Urgent, need opinions on my new crate engine
Quote:
My engine came completely assembled as you can see in the picture below. As I said in a previous post, these engines have gone through at least 4 part numbers which may account for the changes (no water pump and not completely assembled). Fuel pump and starter were the only things not included. |
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11-18-2014, 03:11 AM | #93 | |
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Re: Urgent, need opinions on my new crate engine
Quote:
If it's 1/2" NPT then 72Blue could put his coolant sensor there. |
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11-18-2014, 03:17 AM | #94 | |
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Re: Urgent, need opinions on my new crate engine
Quote:
Do you have a temp gauge or a temp light? |
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11-18-2014, 09:50 AM | #95 | |
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Re: Urgent, need opinions on my new crate engine
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Wow that is a beautiful engine man!! Where did you order it from? And what was the part number when you ordered it? Did it even come with that EGR block off plate already?
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11-18-2014, 09:52 AM | #96 | |
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Re: Urgent, need opinions on my new crate engine
Quote:
Also I see the dipstick is missing....was it just not installed for shipping or was it not included?
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11-18-2014, 10:28 AM | #97 |
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Re: Urgent, need opinions on my new crate engine
You are going to lose performance with that carb.
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11-18-2014, 10:29 AM | #98 |
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Re: Urgent, need opinions on my new crate engine
My crate did not come with a dipstick. I had to buy one at the local parts house.
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11-18-2014, 10:33 AM | #99 |
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Re: Urgent, need opinions on my new crate engine
nah I meant I was going to use the 1406 carb on the 290 HP engine since it didn't come with a carb, but on this one I will use the Holley 670 CFM
what was the part number on your crate when you bought it? And did yours come with a EGR block off plate?
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11-18-2014, 01:26 PM | #100 | |
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Re: Urgent, need opinions on my new crate engine
Quote:
EGR blockoff was included and installed. I bought it in 2010 from a place on ebay in Kalamazoo, MI, that was a clearing house of sorts for excess GM inventory. They had 8 of them with a couple different part numbers. I talked to someone at performance parts tech support about the differences in the part numbers and was told the number I ended up buying (#19201329) had lighter pistons and one or two other changes. One of which may have been the 670 CFM carb instead of the 650 used on the earlier versions. They also told me they'd only made 8 of that version and recommended it. I painted it orange, installed aluminum valve covers, an aluminum air cleaner top, and a dark air cleaner element to give it more of a custom look. I also installed the valve covers so the oil fill, PCV, and breather tube were in the original orientation for our trucks. Here's a picture of the installation. EDIT: Looking at the picture reminds me of a couple other things. Don't forget return springs for the carb. The original throttle rod worked but I had to put a slight bend in it due to the mounting of a Lokar kickdown switch for the TH400. I think you said yours is a TH350 so your kickdown is a different animal. I didn't use the red plug wires that came with the engine as they didn't work with the ram horns. Plug wires are for a 76 or 78 Corvette. Last edited by FirstOwner69; 11-18-2014 at 01:36 PM. |
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