for those who have rebulit heads and the block....(question)

evpena

Senior Member

Posts: 152
#1

for those who have rebulit heads and the block....(question)

03-12-2008, 09:02 PM

I have an 86 z31t motor. i have rebulit the block and and in the process of porting and rebuliding the heads. the question i have is how difficult to have the timing corrext when putting the motor back together. i been talking to a couple mechanics about it and they seem scared and unsure. any info would be greatly appreciated.
nutsaq

Senior Member

Posts: 208
#2

03-12-2008, 09:28 PM

its no different than a timing belt job, you put the belt on so all the lines match the marks on the cam and crank gears and you are done. turn it over a couple times by hand if you are worried about it. Getting the distributor back in right might take a couple trys
SATAN

Senior Member

Posts: 6782
#3

03-12-2008, 10:05 PM

40 belt teeth between the cam dots and 43 belt teeth between driver cam dot and oil pump dot.

85 Z31 6.0 LSX turbo 766whp/792wtq
04 GTO, LS6, big cam, porting, N20… underway for summertime daily driver.
88sinZ

Senior Member

Posts: 2019
#4

03-12-2008, 10:33 PM

evpena wrote: Ii been talking to a couple mechanics about it and they seem scared and unsure..

steer clear of thoes guys

Rule #1 in that trade, Always pretend you know what your doing :gni when in doubt check the books
evpena

Senior Member

Posts: 152
#5

03-12-2008, 10:50 PM

are the valves or the pistons supposed to be aligned any way before i mount the heads on the block. when i took it off the heads and belt i had it on the marks but wondering if it is different after the heads and block have been rebulit?
88sinZ

Senior Member

Posts: 2019
#6

03-13-2008, 07:26 AM

This is a great place to get help, but theres lots of info in the haynes, chilton, and FSM on your questions

rebuilding a motor wont change its timing
OrionMCP

Senior Member

Posts: 349
#7

03-13-2008, 08:23 AM

evpena wrote: are the valves or the pistons supposed to be aligned any way before i mount the heads on the block. when i took it off the heads and belt i had it on the marks but wondering if it is different after the heads and block have been rebulit?

Just set the #1 piston at tdc and set the camshaft gears to the alighnment marks before you reinstall the heads. Its not too complicated.