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  #46 (permalink)  
Old 07-23-2010, 09:07 AM
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Quote:
Originally Posted by oldBodyman
NHRA tech specs

Stroking a 305 has been done by GM themselves, it's called a Pontiac 326.
Stroking a 307 has been done by GM themselves, it's called a Pontiac 350.

GM did it very much better, the Pontiacs have much stronger blocks, much better heads, bigger valves and much longer rods for a better rod/stroke ratio. Stroking the Chevy orphans is just a very expensive way to build a Pontiac AND still come up short.

The only practical use for a stroked 305 is to put it in an Astro van, it will get better mileage than a 350 BUT the 4.3 gets better mileage than either.
A while ago, I linked to a PAGE on the Hendrickson-Osterstock 326 Pontiac (based on the 316!) they used to drag race. They later founded HO Racing Specialties. One bad-A little Pontiac.


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  #47 (permalink)  
Old 07-23-2010, 09:07 AM
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Quote:
Originally Posted by oldBodyman
NHRA tech specs

Stroking a 305 has been done by GM themselves, it's called a Pontiac 326.
Stroking a 307 has been done by GM themselves, it's called a Pontiac 350.

GM did it very much better, the Pontiacs have much stronger blocks, much better heads, bigger valves and much longer rods for a better rod/stroke ratio. Stroking the Chevy orphans is just a very expensive way to build a Pontiac AND still come up short.

The only practical use for a stroked 305 is to put it in an Astro van, it will get better mileage than a 350 BUT the 4.3 gets better mileage than either.
Any idea on what hp/tq the engines produced? SAE.
Im sure its not much more than a 305 HO 85 model year.
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  #48 (permalink)  
Old 07-23-2010, 09:13 AM
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326 made 285 HP in '67, the 350 could be had w/330 HP in '69.
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Old 07-23-2010, 09:22 AM
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Ok. thats not too bad. I was looking at th 77 and 79 model years (which were lower).
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Old 07-23-2010, 07:12 PM
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Just check 1967 - 1972 for the specs. Pontiac used BIG BLOCK heads and valves to get there, something that cannot be done on the Chevy. Pontiac really did try to make these work but gave up on them for High Performance use. Both the 326 & 350 were spanked in public by the Chevy 327 & 350, nothing left to be said.

Pontiac 330HP 350cid 10.5CR = .000 deck height, Flat w/notch pistons, 2113/1773 valves, 425/424 lift, 1.50 rockers.
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  #51 (permalink)  
Old 07-24-2010, 12:38 PM
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Quote:
Originally Posted by oldBodyman
NHRA tech specs



The only practical use for a stroked 305 is to put it in an Astro van, it will get better mileage than a 350 BUT the 4.3 gets better mileage than either.
wrong! ive yet to see one 4.3 get better than 15mpg. a 350 gets better mileage in the astro or an s10 than any 4.3. its less work for 8 cylinders to pull than it is 6.
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