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Does the 57H cam need higher compression on 103?

12K views 20 replies 8 participants last post by  Hillsidecycle.com 
#1 ·
Doing some research on a cam choice and the 57h seems hard to beat for my riding style and setup on my engine which is just a TTS and stage 1. Ive read some post saying that the pre-Rushmore 103 engines could use a little more compression for this cam... anyone with experience with NON-Rushmore 103 that can add some input?
 
#2 ·
Lots of guys running them with stock compression and loving them. I did the .030 head gasket when I did mine. 98hp and 111 tq at 95 degrees and 55% humidity. On a cooler less humid day it's 100 hp or better. So far I'm lovin it.
 
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#3 · (Edited)
So changing out the head gasket gets the compression up... What does it put the compression at roughly? Also, does the cam start pulling pretty early? I ride pretty aggressive so not to worried about pulling super low rpms because im only there for a split second
 
#4 ·
The factory head gasket is .045 thick and when you put the .030 head gasket on it bumps the compression up from 9.9 to 10.1:1. Factory compression is 9.7:1 so your raising it much. There is no doubt it pulls hard to 100 ish mph and I honestly don't know where it falls off past that. I also like to ride hard and so far I am very pleased and not in any way disappointed. It cruises really nice and very drivable around town but rock and rolls when on the throttle.

I was in a really big hurry to get home last week from North Dallas to central Louisiana about 350 miles. I rode from 80 to 100 mph the whole way with no problem. I also got 35 mpg considering I drove it like I stole it.
 
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