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Big Block Talk! Everything about swapping a big block engine into your cart! |
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05-31-2012, 09:04 AM | #1 |
Gone Wild
Join Date: Nov 2011
Posts: 197
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change pushrods when shaving heads?
Assume that I wanted to take a little off the heads to true them up and raise compression. Would the same amount have to come off the pushrods to keep the rocker geometry?
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05-31-2012, 09:24 AM | #2 |
Gone Wild
Join Date: Sep 2011
Location: ARIZONA
Posts: 476
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Re: change pushrods when shaving heads?
Most often not, depending on how much you take off. .040" should be safe. with no other changes. When you get closer to .100" the geometery gets wonky.
A better place to get a performance increase is a timing advance key. Do not spin the engine above 5000rpm without a billet flywheel (which no one makes yet) the iron flywheels tend to grenade. |
05-31-2012, 06:56 PM | #3 |
Gone Wild
Join Date: Nov 2011
Posts: 197
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Re: change pushrods when shaving heads?
Is there anywhere in Phoenix that specializes in milling the heads and maybe porting them? Wonder if this is a $100 or $400 expense.
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06-01-2012, 04:32 PM | #4 |
Gone Wild
Join Date: Sep 2011
Location: ARIZONA
Posts: 476
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Re: change pushrods when shaving heads?
Skimming the heads should be about $30 or so per.
Any good machine shop can do it. Porting has not been worth it in my experience. I have had 2 sets of heads ported and saw minimal if any gains. |
01-29-2013, 10:56 AM | #5 |
Not Yet Wild
Join Date: Jul 2012
Location: Michigan
Posts: 51
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Re: change pushrods when shaving heads?
I milled my heads on my v twin 14 hp .60 should I do anything else to the motor?
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01-29-2013, 02:55 PM | #6 | |
Gone Wild
Join Date: May 2011
Location: Pickens/Dacusville s.c.
Posts: 1,386
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Re: change pushrods when shaving heads?
Quote:
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01-30-2013, 09:32 PM | #7 |
Vegas modded 420
Join Date: Jun 2009
Location: West MI
Posts: 15,445
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Re: change pushrods when shaving heads?
If you take the governor off at least put a rev kit in it, which is typically valve springs or shims and better pushrods/etc. Vanguards were around 100 for that last time I looked. Then you can safely run it pretty hard, as the stock cam dies at high rpm anyway (but well beyond the stock governor rpm).
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