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Old 05-24-2019, 11:16 AM
fintubi fintubi is offline
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Join Date: Aug 2013
Location: Los Gatos, CA
Cobra Make, Engine: ERA #3014; 331 CID SBF
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Quote:
Originally Posted by DanEC View Post
What I did was trial fit the header pipes to the engine while it was on a stand. Then I took a 1x4 board and drilled it for the header bolt pattern. Then I pulled each side off the engine, still assembled and bolted them back to back on the board using the board as a substitute for the engine to hold all the flanges tight and aligned. That also allow you to pretty easily see if it looks like they are fairly symmetrical as far as the collector alignment.
Ah, I see - you 427 guys have it harder because the collectors are part of the sidepipe, so the tabs need to retain 4 individual primary pipes to the sidepipe assembly.

On the 289, the collectors are integral to the header weldment and the tabs are just used to secure a single, large downpipe leading from the header outlet to the muffler inlet.
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