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1968 Malibu sport coupe, 489 ci. 590 hp 600 tq, RV T-400 Freakshow 3200 stall, 3.73 12 bolt posi
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Ive used the BB 1 3/4" uncoated long tubes and they were an excellent fit but dont know about the SB headers but my guess is theyre made by someone else since Summit dont make parts so try to figure who made them and go from there JMO
 

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I’m pretty sure they are the old dynomax headers. I have a set of dynomax that look the same. Had them for almost 20 years, the coating isn’t very good but they are still functional without leaks.
 

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I have them on my SBC. great fit and no issues after 12 months so far.
 
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I have them on my SBC. great fit and no issues after 12 months so far.
Awesome. How close are they to your transmission crossmember?
 

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i ahve the summit (gtech) crossmemeber and run a 700r4. so there is plenty of clerance
 
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