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Old 01-07-2007, 09:28 PM
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first truck engine build

Im about to build my first engine and here are the specs of the engine:

Solid Cam: 230/236 duration .515/.525 lift @ .050" 112 lobe sep.
'71 350 LT1 bored 60 over, domed .100 pistons, 11.5:1 compression
2.02/1.60 heads ported/polished
4.10 dana 60 rearend
speed demon 650cfm mechanical sec.
eldelbrock rpm proformer intake
2500rpm stall

my question is, if i were to put a 327 crank in it would that help with horsepower and make it faster with those low of gears, or should i leave the 350 crank in there to help keep the torque up since it is in a truck.

Any thoughts are much appreicated.

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Old 01-07-2007, 09:30 PM
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Leave the 350 crank in there unless you want to buy new pistons and reduce your displacement by 23 cubic inches.
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Old 01-07-2007, 09:35 PM
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why would i have to change my pistons? I understand the lost of displacement, but the performance gain would be in the rpm right?
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Old 01-07-2007, 09:39 PM
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What are you going to use this truck for?? If its just a weekender then I guess the solid cam and 11.5:1 compression is ok. BUT if its a daily driver then its a bad combo...in my opinion.
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Old 01-07-2007, 09:44 PM
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this is my weekend warrior... balls to the wall truck. just trying to figure out the best way to support that rearend and make it move fast. thats why i throw out that 327 crank quesiton...
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Old 01-07-2007, 10:00 PM
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The only thing a 327 crank is going to do for you is give you a 327. What truck do you have? If you've got a Dana 60 I'm going to guess that you have a 3/4 ton or a 1 ton... Right??? Even if it's a half ton it's still going to be heavy so you don't want to sacrifice any cubic inches. You actually might want to stroke it to a 383. Of course if you go to a 383 you'd have to change the pistons to some meant for use with a 383. Running a 327 crank with 350 pistons is going to drop your compression into the basement, just like running a 383 crank with 350 pistons is going to make it skyrocket. Of couse, running a set of 5.565" connecting rods from a 400 with 350 pistons will not change compression.
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Old 01-07-2007, 10:06 PM
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the truck is a 71 custom/10 delxue. disc brakes up front and drums in the rear. coils all around. tci streetfighter th350 tranny.

but if i were to put a 383 crank and change the pistons, i would sacrifrice rpm and compression right? OR if i did put a 383 crank in it with the pistons and 5.7 rods i have how much would that bump up the compression?

im just trying to find the happy medium of torque and HP in a truck and make it go fast with what i got and maybe a little change here and there.
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Old 01-07-2007, 10:09 PM
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You got a leaky spark tube...
 
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More cubic inches is the happy medium for going faster, especially for trucks. When going to a 383 you just need to get the correct pistons for the engine. You can get them for just about any compression ratio you want. A 350 would work but a 383 would work better. I went to a 236 duration cam for the 350 in my Blazer and it became a dog below about 2200 rpm. 4500lbs is a lot to get moving when you're limited with cubic inches.
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Old 01-07-2007, 10:13 PM
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what did that cam do above 2200rpm in your blazer?
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Old 01-07-2007, 10:25 PM
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You got a leaky spark tube...
 
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Nothing too noticeable. I picked up about 400 rpm on the top end. I went from a 226/234 hydraulic lifter cam to a 236/236 cam with solid lifters.

Where did you get a Dana 60 for a half ton? To my knowledge, the 12 bolt was the standard rear axle for half tons during that time period.
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Old 01-07-2007, 10:38 PM
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came with the truck when i bought it, i dont know where the dana 60 came from but the guy i bought it from, said he had it put in because he wanted to have a dana 60 posi with 4.10's.... and now im trying to make this truck go fast without having to put a new rearend in it, like some 3.73's or even a 3.55posi ...

what kind of HP and torque did you see out of your 236? how fast did you spin it upto?
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Old 01-07-2007, 10:56 PM
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You got a leaky spark tube...
 
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I don't know what it made, I've done more stuff since then and I still don't know. If I leave it in drive it'll shift at about 6300 rpm.
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Old 01-07-2007, 11:06 PM
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well it sounds like i should run with the crank i have and see what it can do and go from there. once i get it running ill dyno it and post numbers when i get them.

hows the idle on that 236 you have?
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Old 01-07-2007, 11:12 PM
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It's got a noticeable idle. I ended up going to forced induction and the idle smoothed out somewhat after that. The 350 will work fine just don't go out racing Camaros and Mustangs expecting to beat them because that probably won't happen. You can still have a good performer though. 4.10 gears will work well, what size tires do you have?
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Old 01-10-2007, 12:06 AM
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i think it could beat a camro or crustang. hell i have an 07 silverado with a 300hp 283sbc and i can beat the new hemi trucks... so i think my 364 can beat them. I have 17" rims all around 17x8 in front and 17x10 in rear. fronts are 245/45/17 rears are 275/45/17
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