Originally Posted by FmrStrtracer
With the stock motor, the 1 1/2 primaries will bump up the off idle and midrange torque better than a bigger header will. Youre trying to improve the flow with-in the engines operating range. This is one of those areas where bigger is not better.
If your engine had a compression bump, better flowing heads, a larger cam, matched intake, then you would want the larger headers.
Hooker makes a great fitting header, they offer different colors of ceramic coating, and they last. I got 25 years out of my last set of Hookers.
Make sure you read the warrenty of any header that you decide to buy, not all ceramic coatings are the same, and some are not guarenteed.
i hear ya but it wont really be considered "stock" once i get the 601 ported heads with 53cc chambers will it?
it was actually a typo on my part i'm thinking full length headers 1-5/8" primary tubes with 2-1/2" or 3" collectors.
the cam i have now is the E-274-S - Elgin Industries : Online Catalog
Fits: 1955 to 1994 283ci - 305ci - 307ci - 327ci - 350ci - 400ci
• 258°/269° Adv. Dur.
• 112° Lobe Center
• 40° Overlap
• Idle Quality: Smooth, stock type
• Power Range: 1000 - 3200 RPM
• Good choice for heavy towing
• Recommended spring pressure 95lbs. for valve on seat; 240lbs. for valve open
• Compression: 9.0:1 or less
• Transmission: Stock auto or Manual
pretty sure from the builders mouth i have the "1470-8" pistons - Keith Black/KB Pistons 1470-080 - Silv-O-Lite Cast Pistons - Overview - SummitRacing.com
page 66 , part #1470- http://www.kb-silvolite.com/assets/0...te_catalog.pdf
thinking a cam with 216/216 or 218/218 with my stock converter.