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Old 05-14-2003, 03:36 AM   #1
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Question about shaving heads?

I want to get my heads shaved a bit. I'm not sure how much to tell them to cut? If I do this, will there be much of a problem with p/v clearance? Usually how much does this cost? Right now, I'm running 1.7 rockers, will this mod probably result in me needing to go to 1.6 rockers? I'd like to get as much shaved as possible. Want to get as high a compression ratio as possible.

Thanks in advance,
Forrest
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93 NOTCH ex-4-cyl, will be N/A'd temporarily. Edelbrock heads, 1.7s, 2031 cam, TFS Street Intake,BBk longtubes, BBK cold air, ultra-flows,cobra r's,UPR uppers and lowers, 3:73,2.95 t5-z,nitto dr's---
01 GSXR1000 strapped, lowered, etc.
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Old 05-14-2003, 03:39 AM   #2
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I have '70 351 heads shaved .030" with 1.94/1.6" valves and an AFM n3 cam....no p/v clearance issues with the stock pistons, .0395" compressed thickness gaskets, .012" piston to deck clearance

total cost was $50
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93lx, Typhoon intake, TW heads, stock cam, full exhaust, 3.73's, dbl adj uppers, hpm mb sr lca's, strange 10ways, frnt coil overs, junk upr cc's, qa1 k, dr's - typical pos fox body
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Old 05-14-2003, 04:09 AM   #3
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Did you notice any difference after you shaved the heads?
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93 NOTCH ex-4-cyl, will be N/A'd temporarily. Edelbrock heads, 1.7s, 2031 cam, TFS Street Intake,BBk longtubes, BBK cold air, ultra-flows,cobra r's,UPR uppers and lowers, 3:73,2.95 t5-z,nitto dr's---
01 GSXR1000 strapped, lowered, etc.
2006 Speed 6, Black Mica -Big turbo, etc
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Old 05-14-2003, 04:13 AM   #4
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$50 missing from my wallet!

if you're getting the heads milled purely for performance and no other reason you would be much better off spending your money elsewhere. $50 for milling + $70ish for head gaskets + $20 for intake gaskets + $15 for exhaust gaskets + $10 for valve cover gaskets + taking perfectly good heads off a car only to waste money and maybe gain 10 hp = not too wise of a choice

if you're going to take the heads off anyway, port them before getting the pair milled
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93lx, Typhoon intake, TW heads, stock cam, full exhaust, 3.73's, dbl adj uppers, hpm mb sr lca's, strange 10ways, frnt coil overs, junk upr cc's, qa1 k, dr's - typical pos fox body
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Old 05-14-2003, 11:51 AM   #5
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A point of compression is worth 4% HP gain. SO going from 8.5-1 to 9.5-1 compression on a 235hp engine results in a gain of 9hp.

But going from 12-1 to 13-1 on an 800 hp engine nets 32 hp. Milling the heads will get rid of sluggish throttle response because of a larger cam use. Most large cams have a recommended minimum compression value with the advertising literature.
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Old 05-14-2003, 12:11 PM   #6
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The reason I'm askin is here. I'm trying to get a little faster with the motor first. Any ideas?
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93 NOTCH ex-4-cyl, will be N/A'd temporarily. Edelbrock heads, 1.7s, 2031 cam, TFS Street Intake,BBk longtubes, BBK cold air, ultra-flows,cobra r's,UPR uppers and lowers, 3:73,2.95 t5-z,nitto dr's---
01 GSXR1000 strapped, lowered, etc.
2006 Speed 6, Black Mica -Big turbo, etc
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