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#1
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318 Head work price?
Just wondering, here; I am building my 318 and I definitely want to do a little head work. I was thinking maybe a small port/polish job and possibly opening the valves to 1.88/1.60.
The Eddie heads are expensive, and this won’t be a street thumper car, I just want it to breathe better and squeeze out a few more horses. Even cast iron heads from Summit are like $350 a piece for basically what I want done to mine. My question is: Anyone know the ballpark range of a machine shop doing the head work vs. me just buying heads? I’d like to use the originals if at all possible. The 318 is going into a very big car, not a racer, and I’m in CA. Any thoughts are appreciated! |
#2
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I'd take another look at what you can buy of the shelf. Its all about cfm flow through the head. A few hundred more bucks could be another 40 hp! And doubtful you will get a consistent job for each cylinder by porting yourself, unless you are an expert.
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#3
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Hmm, interesting. I was thinking it'd surely be cheaper to have a machine shop do a little work than to buy expensive stuff off the shelf. I worry about the quality, though. I dunno... sigh...
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#4
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Quote:
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#5
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Most newer heads for sale are CNC machined, so ports are all exactly alike, a big plus!. I'm not a small block expert, but
I'm sure there are some newer 340/360 heads that will livin up your engine! Check the net for 318 build/upgrade projects. http://www.moparmusclemagazine.com/t...d/viewall.html |
#6
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#7
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I do imagine you are talking about a 318LA and not a poly. You do have options available for an LA but with a poly headwork is the only thing available. No aftermarket/new head is made for a 318A.
My headjob was mega bucks and I got a deal . |
#8
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Thanks, cudabob496! Yea, it’s the LA engine, ’68, sorry, forgot to mention that. I had completely forgotten about MOPAR Action. Nice!
Rich, those are some real, real nice looking heads. |
#9
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Ok, most folks arn't doing iron heads, its sort of a specialized area becuase why would you cut on cast iron when aluminum has so many advantages (like being easier to cut). But my rule book says use cast iron, so... I have not explored the cost of a really limited head prep (simple clean-up with a good valve job). but the fully ported (1.94"/1.6") 302 heads on my Dart's 318 (324.5) cost about $1850 with valves, shipping, and a $200 core charge From Shady Dell Speed Shop in PA. I actually call that a pretty good deal considering they are supporting 330 RwHp/300 RwFtLb on pump gas.
I'll add this data here as it applies to iron 273/318 heads mostly: Here are some flow numbers I've collected over the past ten years: STOCK 302 1.78"/1.5" (Shady Dell) 0.100" 62.8 NA 0.200" 125.6 70.9 0.300" 158.4 92.8 0.400" 169.3 99.6 0.450" 170.6 101.0 0.500" 170.6 102.4 0.550" 170.6 102.4 0.600" 170.6 102.4 As Cast "302" 1.78"/1.50" (Dart/MPC) 0.100” 51.8 36.5 0.200” 92.5 70.7 0.300” 130.1 104.3 0.400” 163.9 113.2 0.450” 169.1 115.2 0.500” 170.4 117.3 0.550” 172.2 119.0 0.600” 172.5 120.4 "J" 2.02"/1.60" (Shady Dell) 0.100” 62.1 46.6 0.200” 112.1 99.4 0.300” 156.6 128.3 0.400” 193.2 137.3 0.450” 200.1 138.3 0.500” 200.1 139.7 0.550” 200.1 140.8 0.600” 200.8 141.5 Ported (Shady Dell) "302" 2.02"/1.60" 0.100” 71.8 42.5 0.200” 148.4 86.3 0.300” 212.2 113.9 0.400” 241.5 131.1 0.450” 244.6 137.7 0.500” 246.7 139.7 0.550” 242.6 144.9 0.600” 240.8 144.9 Ported (Shady Dell, Heads on the Dart Prelminary) "302" 1.94"/1.60" 0.100” 68.8 47.5 0.200” 138.4 110.3 0.300” 202.2 130.9 0.400” 221.5 141.1 0.450” 230.6 157.7 0.500” 234.7 170.7 0.525" 238.0 175.0 0.550” 236.6 170.9 0.600” 236.8 171.9 Ported "302" 1.94"/1.60" Actual Numbers Final intake port volume: 136 cc Shady Dell | MPC 1 | MPC 2 LIFT IN / EX | IN / EX | IN / EX 0.100" 66.1 / NA | 63.6 / 48.4 | 65.7 / 49.6 0.200" 132.8 / 90.4 | 126.0 / 95.8 | 128.6 / 94.5 0.300" 189.9 / 126.2 | 175.3 / 131.9 | 174.7 / 130.6 0.400" 218.4 / 148.8 | 210.4 / 155.3 | 208.6 / 157.5 0.450" 227.9 / 152.9 | 218.1 / 161.9 | 216.6 / 166.0 0.500" 232.8 / 159.8 | 199.5 / 165.7 | 205.7 / 171.1 0.550" 238.0 / 163.9 | 200.1 / 167.6 | 203.0 / 173.3 0.600" 239.1 / 169.8 | | "J" 2.04"/1.625" 0.100” 62.1 51.8 0.200” 135.2 103.5 0.300” 198.7 135.2 0.400” 239.8 158.7 0.450” 253.9 169.7 0.500” 258.4 182.9 0.550” 264.9 186.3 0.600” 254.6 186.3 273 Ported 1.88"/1.60" Maryland Performance Center (MPC) 0.100" 60.93 48.78 0.200" 122.75 99.78 0.300" 179.68 137.16 0.400" 197.02 157.11 0.500" 185.91 168.20 0.600" 187.24 179.29 273 Cleanup Port/Valve Job 1.78"/1.50" Maryland Performance Center 0.100" 49 43 0.200" 98 85 0.250" 124 100 0.300" 145 112 0.350" 162 120 0.400" 179 125 0.450" 188 129 0.500" 190 132 0.550" 185 134 0.600" 177 135 |
#10
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Cool! I guess I'll give a few local machine shops a call. I'm not looking for race heads, just something to wake things up a tad.
I'll let y'all know what I find out. |
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