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C3 Fuel, Emission Control, and Exhaust Systems

Hooker Headers-long or short tube (1/2)
 12/3/17 10:55pm
JC VETTE 70
Former Member

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, - Canada

Vette(s):
70 VETTE 350/300HP, AUTOMATIC, ALL STOCK EXCEPT FOR MILD CAM,LAGUNA GREY, 3:55 POSI GEARS


Joined: 3/9/2008
Posts: 164

Still debating if I should install headers ? I have a stock 350/300 motor with a mild cam. Will I notice a slight hp gain and sound ? Long or short tube headers ? Which Hooker headers do you recommend for my motor ?

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Re: Hooker Headers-long or short tube (2/2)
 12/4/17 1:21pm
vince vette
Limited Member
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Vette(s):
1980 L82 White with doeskin interior


Joined: 1/5/2016
Posts: 72

I don't claim much expertise, but I've been looking into this for a while during the time I've spent getting my '80 L82 back on the road after a 13 year hiatus. At this point I'm not looking at the question of long or short tubes, but instead thinking seriously about Tri-Y style headers. The L82 engine option's stock cam is a mild street profile which shifted the torque an HP band up about 1000 RPM from the standard L48 engine. Specifically the L48 peaked at around 4,200 RPM and the L82 peaked at 5,200 RPM. Engines which have peak hp up to around 5,500 RPM tend to benefit from the tri-y design. The reason is that mild cams tend to gain most of the hp by shifting the torque curve up in the high RPM range. But in doing so they end up requiring the engine to get to a higher RPM before getting into the power band (something you may not notice much with a 3.55 rear end but which is painfully obvious with a 1980's 3.08 read end). The tri-y's are specifically designed to improve exhaust efficiency and thus torque at the lower RPM range. 

Since your profile shows a '70 vette and you state it was 300 hp/350 ci, then I guess it is the standard ZQ3 engine for the year. Specs show this with a pk hp at 4800 RPM. So given the mild cam I would guess that you're peaking now around 5,500 to 5,800. This would seem to be a range where tri-y's would be considered. 


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