E-street vs Promaxx vs 440 Source
And then...... sometimes even heads that have been built at a shop.......have things screwed up.
Here’s a set of SBM RPM heads built from bare castings that someone sent me to look over.
Intake and exhaust valves not the same OAL..... along with also having a different tip length.
So, noticeable spread in tip height..... and an even a bigger spread in installed height.
Then there was also “that one spring”......
And then...... sometimes even heads that have been built at a shop.......have things screwed up.
Here’s a set of SBM RPM heads built from bare castings that someone sent me to look over.
Intake and exhaust valves not the same OAL..... along with also having a different tip length.
So, noticeable spread in tip height..... and an even a bigger spread in installed height.
Then there was also “that one spring”......
