I know I will hear BOO HISS for what I'm about to post.
I have a 406 in a '78 TA. It makes 380HP & 420 TQ with Doug's Headers. Absolutely no issues with it at all with cooling etc... It is the 988 XX block with 6x4 heads milled and generate 9.45 to 1 compression. Here is where the BOO HISS starts. It has the XE274H-10 cam with 1.5 to 1 ratio roller tip rockers. It has a 700R4 behind it with 3.73 rear gear. Very satisfying ride.. I recently changed the X-pipe to an H-pipe. What a difference. I can hear the lope of the cam like never before. It has plenty of power for what I want from it. I'm not a racer, but I think it is low 14 to high 13 second car. It sounds like a bad a**, but has very good manners on the street.
In closing, even with the 110 LSA it has plenty of vacuum for power brakes.
Last edited by napster; 09-20-2022 at 01:21 PM.
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