Quote:
Originally Posted by Keithc8
The 1 7/8 will be fine for what you are doing. You want to make sure they are not blocking the parts at the head opening. The next restriction will be the sidepipe muffler size. I have seen some of these as small as 1 1/2 and that really restricts the Hp as well. Thanks, Keith Craft
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This is what I have found to be true.
Using the 205 AFR heads, the standard SPF headers blocked part of the exaust ports and hurt hp.
2" SS headers were opened up at the exaust ports and helped hp (45hp) Grinding the blocked part on the 1-7/8" will do the same.
Work on the mufflers.
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