Issues measuring pushrod length
07-16-2013, 11:41 PM
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Issues measuring pushrod length Trying to get correct pushrod length setup and having fits
Ls7 engine, stock bottom end and block. Just put on heads that were milled .030". Yella Terra rockers. BT SLR lifters. Stock cam.
Im not sure what is going on. I Have #6 and #1 at TDC (Placed there when putting on heads so I know its there and cam should be on base circle)
Drivers side:
2 1/2 turns exhaust
2 1/8 turns intake
Passenger side
1 7/8 turns exhaust
2 1/8 turns intake
I measured installed height of all my springs with a barrel mic, they are all within .005-.007 of each other which to me means the seats were not machined too deep. The intake is the same on both heads, so the mill work should be even from head to head, right?
So how to I get such a big discrepancy on the exhaust measurement? Ive measured several times using different rockers and different pushrods (OEM length for now to test) with the same results. So confused :crazy: Any ideas?
Ls7 engine, stock bottom end and block. Just put on heads that were milled .030". Yella Terra rockers. BT SLR lifters. Stock cam.
Im not sure what is going on. I Have #6 and #1 at TDC (Placed there when putting on heads so I know its there and cam should be on base circle)
Drivers side:
2 1/2 turns exhaust
2 1/8 turns intake
Passenger side
1 7/8 turns exhaust
2 1/8 turns intake
I measured installed height of all my springs with a barrel mic, they are all within .005-.007 of each other which to me means the seats were not machined too deep. The intake is the same on both heads, so the mill work should be even from head to head, right?
So how to I get such a big discrepancy on the exhaust measurement? Ive measured several times using different rockers and different pushrods (OEM length for now to test) with the same results. So confused :crazy: Any ideas?
Last edited by atljar; 07-17-2013 at 07:54 AM.
07-21-2013, 05:05 AM
#2
If by passenger side you mean #6 cylinder, it sounds like you have the cam at cyl 1 firing and cyl 6 on exhaust stroke...and the #6 exhaust lobe is still on the ramp w/ the exhaust valve partially open.
Rotate the crank 360deg to put #6 at firing stroke TDC and re-measure.
Rotate the crank 360deg to put #6 at firing stroke TDC and re-measure.
