1971 Truck 360 Questions
#84189
07/05/08 12:36 AM
07/05/08 12:36 AM
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Joined: Jun 2006
Posts: 5,159
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GTX MATT
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OP
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Joined: Jun 2006
Posts: 5,159
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Picking up a '71 truck 360 tomarrow with the 2.02/1.60 valve heads, Thermobog, ect. Runs really well. Just wondering what the compression might be and what the general consensus of this motor might be.
Anyone who built a strong running 360 out of a stockish block feel free to share stories and specs. Im hoping this thing can get me high 12s or low 13s after I cut the heads, change the cam, put headers on it, converter, good gears, etc.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: 1971 Truck 360 Questions
[Re: GTX MATT]
#84190
07/05/08 12:56 AM
07/05/08 12:56 AM
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Joined: Feb 2004
Posts: 4,501
Gainesville,FL
goldmember
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master
Joined: Feb 2004
Posts: 4,501
Gainesville,FL
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Stock compression is very low,KB 107 pistons are a very nice choice. Mild cam 230-240 @.050 approx .500 lift,headers,LD340 or RPM airgap manifold,holley carb 650-750 DP,3500 or more converter,4.10ish gearing and it's just no big deal to run high 11's to low12's in an Abody. I'll assume the heads have had 2.02 intake valves installed? They left the factory with 1.88 intake valves.Find someone good to do a quality valve job and bowl porting. In a truck at 3800lbs you could possibly run high 12's.
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Re: 1971 Truck 360 Questions
[Re: goldmember]
#84191
07/05/08 01:28 AM
07/05/08 01:28 AM
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Joined: Jun 2006
Posts: 5,159
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GTX MATT
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Alright. I havent run the numbers on the block itself yet but the castings for the heads are the ones with the 2.02 valves. Suspriciously though the block (and everything else) are painted orange (like the 340s were) and its the ONLY coat of paint on the block. Also has a four barrel thermoquad intake and everything on it.  Sure hope I dont get gipped and wind up with a 340.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: 1971 Truck 360 Questions
[Re: goldmember]
#84194
07/05/08 08:35 AM
07/05/08 08:35 AM
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
MoparforLife
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
Yes the casting numbers are the same 340 or 360. The 1.88 intake valve isn't a big problem and who knows maybe someone put some 340 heads on a 360,no big deal. Look at the block,the year and cid should be on it.
340/360 used the same head castings after the 360's were introduced. That is like saying that 'my 383 has 440 heads'. The earlier 340 X head casting wasn't that much different that it would make a difference. the 2.02 valves will not be a help unless you are spinning in excess of 6000, in fact the 1.88 valve heads may in fact have better low end.
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Re: 1971 Truck 360 Questions
[Re: goldmember]
#84196
07/05/08 02:09 PM
07/05/08 02:09 PM
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Joined: Jun 2006
Posts: 5,159
CT
GTX MATT
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OP
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Joined: Jun 2006
Posts: 5,159
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Well it seems that this engine has been rebuilt because the block is from 1985. Has the 915 heads on it though. Any idea on what the compression should be on a stock '85 four barrel 360?
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: 1971 Truck 360 Questions
[Re: goldmember]
#84198
07/05/08 02:38 PM
07/05/08 02:38 PM
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
?? Maybe I didn't make my point very clearly,it was late. If he found the heads to be 915's they could have either intake valve,it really doesnt mater much IMO.
Very true. Early 915's could be either. Either way on a 360 make sure to get rid of the rotaotrs on the exhaust valves and install regular length valve springs and retainers.
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