ziggo0
10+ Year Contributor
- 774
- 7
- Oct 13, 2009
-
La Porte,
Indiana
Alright, this is a very confusing one - decided to post it since I can't find a lick of information on it.
I pulled this head from a Jasper rebuilt motor last year, it had 130k on it - 30k on the rebuild. The bottom end was in ok shape but the head looked VERY clean...so I kept it around. This years build I used the head for my 6 bolt, had it drilled for head studs, cleaned up by the machinist. I did my valve springs/retainers/lifters etcetc and I also got a set of SIM 275 cams. All good right? Nope.
First start I had this obnoxious knock in the head...I quickly narrowed it down to the intake cam. I figured since they were regrinds there was something that could've gone down hill with that. You could clearly see the amount of play the cams had lateral and axial in the journals. You could infact see through the journals at an angle. Here is what I'm talking about:
YouTube - MVI 0186
I decided to then try the stock cam to narrow down what it could be...stock cam fits great....
YouTube - Stock Cam
So it's gotta be the regrind right? Nope...I mic'd those according to the specs Delta gave SIM, they are solid and as it turns out - my head is...oversized? Which means I have oversized stock cams...? How is that possible? I've never heard of that...I mic'd the stock cams and they are both 'larger' than OEM spec.
...with that being said, what course of action should I take? Get my head fixed? Send this 'stock cams' to Delta for a regrind to fit my head? Get a bare 2g head somewhere? Nothing is easy with this car I swear
I pulled this head from a Jasper rebuilt motor last year, it had 130k on it - 30k on the rebuild. The bottom end was in ok shape but the head looked VERY clean...so I kept it around. This years build I used the head for my 6 bolt, had it drilled for head studs, cleaned up by the machinist. I did my valve springs/retainers/lifters etcetc and I also got a set of SIM 275 cams. All good right? Nope.
First start I had this obnoxious knock in the head...I quickly narrowed it down to the intake cam. I figured since they were regrinds there was something that could've gone down hill with that. You could clearly see the amount of play the cams had lateral and axial in the journals. You could infact see through the journals at an angle. Here is what I'm talking about:
YouTube - MVI 0186
I decided to then try the stock cam to narrow down what it could be...stock cam fits great....
YouTube - Stock Cam
So it's gotta be the regrind right? Nope...I mic'd those according to the specs Delta gave SIM, they are solid and as it turns out - my head is...oversized? Which means I have oversized stock cams...? How is that possible? I've never heard of that...I mic'd the stock cams and they are both 'larger' than OEM spec.
...with that being said, what course of action should I take? Get my head fixed? Send this 'stock cams' to Delta for a regrind to fit my head? Get a bare 2g head somewhere? Nothing is easy with this car I swear