LQ4 head question
07-04-2016, 10:52 PM
#3
Thats a vague question to ask without listing other specs like the cam and how thin of a gasket will be used.Many have gotten away with milling .030 on a stock gasket and still run stock length pushrod but im sure if yo use a pushrod length check you probably would need a shorter length.Just because most have gotten away with doing things doesnt mean its 100% correct way to get things done..and I include myself in playing the assumption game matching parts based on things I read online and not physically measure them..sometimes it will bite you.Most vendors will tell you to measure..regardless how many times they sell common parts when it comes to selecting a pushrod..any vendor is asked stated that a stock length with a particular cam/head combo was ok with 7.4 rods but for a optimized setup..measure the length and order accordingly...if the stock length tends to be a tad too long..dont complain later you didnt measure the first time!
07-05-2016, 06:21 AM
#4
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07-05-2016, 06:23 AM
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Thats a vague question to ask without listing other specs like the cam and how thin of a gasket will be used.Many have gotten away with milling .030 on a stock gasket and still run stock length pushrod but im sure if yo use a pushrod length check you probably would need a shorter length.Just because most have gotten away with doing things doesnt mean its 100% correct way to get things done..and I include myself in playing the assumption game matching parts based on things I read online and not physically measure them..sometimes it will bite you.Most vendors will tell you to measure..regardless how many times they sell common parts when it comes to selecting a pushrod..any vendor is asked stated that a stock length with a particular cam/head combo was ok with 7.4 rods but for a optimized setup..measure the length and order accordingly...if the stock length tends to be a tad too long..dont complain later you didnt measure the first time!
07-05-2016, 11:17 AM
#6
What gasket are you thinking ? So you have a early 99- 00 LQ4 what tranny are running behind that ? Have you heard the engine run yet ? A mill of .030 should net you a cc of approx. 67 cc , nice little bump in cr and a weight savings advantage to top.
07-05-2016, 01:22 PM
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It's from a 2000 GMC 2500, I heard it run and helped pull it out. I am having a 4L80E rebuilt to put behind it. Should be a fun cruiser!
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07-05-2016, 09:10 PM
#8
Stock cam with stock gasket you "should" be fine with milled 317 heads which is a healthy bump up in compression.If you go thinner than stock gasket and have a target c/r your trying to achieve..measure for proper pushrods.They are cheap for hardened rods and peace of mind.We are talking $100 vs damaging valves,pistons etc.And keep in mind the stock pushrods are known to bend easy..Id opt for hardened replacements anyway.