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-   -   350 - 270 Combo Horsepower (https://classracer.com/classforum/showthread.php?t=58366)

gsa612 06-23-2015 11:37 AM
Re: 350 - 270 Combo Horsepower
 
1 Attachment(s)
The 287 manifold would be considered "flat"compared to a 68-69 396/325 (shown).There not as restrictive as you may think,as the 71' 454/365 Chevelles and Corvettes use it,with 50+ more ci.and the same cyl. head (#820). gsa612

Dwight Southerland 06-23-2015 02:06 PM
Re: 350 - 270 Combo Horsepower
 
This is flat : '72 up manifold.
http://i39.photobucket.com/albums/e2...ps9dsm1rpb.jpg

gsa612 06-23-2015 04:26 PM
Re: 350 - 270 Combo Horsepower
 
In '72 it gets screwed up,you have to run that ^^ flat intake (#753),and head #'s 241 or 292. In '71 you have to run the 287 manifold (semi-flat lol..) with a choice of head #'s 820,241,292, with the 820 being the best.Both years are factored at 315 hp. I can't see why the '72 can't also run the 820 casting along with the other two. If anything the 72 combo should allow the 820 head and drop 10 hp to 305 in rating because of the lower more restrictive intake.Then you might have something,as all other components (cam lift,pistons etc.) are the same. gsa612

Doug McCue 06-23-2015 06:08 PM
Re: 350 - 270 Combo Horsepower
 
Quote:
Originally Posted by rick winchester (Post 473523)
I hate to get into a pi%%ing contest on which engine is better . that being said anyone who thinks a 402/315 is better than a 350/270 is mistaken. If I am wrong someone needs to notify Demarzo,Johnny Gray and Sepanek so they will quit wasting their money and time running them. This is just one guys opinion ,I can say that the 402/315 is way to high. 280 to 285 would be a lot closer in stock. SuperStock is a different story. Oh by the way I run the 350/270 @278 not 270. Rick.
Big blocks as a whole are rated way to high as far as hp is concerned


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