350 - 270 Combo Horsepower

[rick winchester]

Yes that's what I mean. If I remember right Cal Method ran that engine in a 71 Camaro years ago.He is one of best out here at making one run and changed for a reason. If you look at the class guide you can run 0/sa with a 350/270 @40 lbs lighter than you have to weigh in K/sa with a 402/300/315. I am not cutting your combo because anyone that can run under the index impresses me and that's not easy with anything. If you want to stay in K/sa you can make your car a Nomad 2 seat wagon @585 lbs.lighter than the 402. Its not going to be easy with any engine,but I know I would rather have the 350. Good luck. Rick.

[njk53]

Originally Posted by rick winchester

Yes that's what I mean. If I remember right Cal Method ran that engine in a 71 Camaro years ago.He is one of best out here at making one run and changed for a reason. If you look at the class guide you can run 0/sa with a 350/270 @40 lbs lighter than you have to weigh in K/sa with a 402/300/315. I am not cutting your combo because anyone that can run under the index impresses me and that's not easy with anything. If you want to stay in K/sa you can make your car a Nomad 2 seat wagon @585 lbs.lighter than the 402. Its not going to be easy with any engine,but I know I would rather have the 350. Good luck. Rick.

I think the main problem with the 402 in our 71 wagon is the intake manifold. Our current engine builder said the manifold is the limiting factor for making good power with that engine. I would love to stay in K/SA (because I have 2 engines and parts to boot) but, I also want to be somewhat competetive within my own class. Currently I am not anywhere near what other K stockers are running. The car itself is a good car hooks good, drives straight, and is an easy car to drive. I'd would like to keep it even if I have to go to a different engine combo.

[Mark Yacavone]

(1970) 350, 2bbl, R/SA Not much more weight .
Not many heads up runs that you couldn't handle in Div 3

K/SA is a bad place to be if you can't run at least 11.80.

[Doug McCue]

Originally Posted by rick winchester

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

[gsa612]

According to the tech. specs the 70/350 and 71/300 402 both run the same intake (flat #287).In order to get the 300/402 to be competitive you need a custom grind camshaft,if you have one of the "off the shelf" cams your leaving 2 tenths on the table,There basically a 325/396 cam with more ex. lift,but don't compliment the semi-open head (105cc) on the 300/402 which produces low torque #'s.With the right combo,cam/converter/gear,carb,light trans,good ring seal,right tune-up ( jetting,timing etc.) it should run with the majority of the cars in K. JMO gsa612

[Dwight Southerland]

Here's a picture of a 287 manifold. Doesn't look flat to me. The differences between the '70 and '71 engines are the heads (290 heads flow well and have a good combustion chamber design, 820 heads flow okay but the combustion chamber is sucky; not sure about the other '71 heads), camshaft, and 1.7 points of blueprinted compression (11.3 for the '70 and 9.6 for the '71). See www.classracerinfo.com for the actual calculated compression ratios.

[gsa612]

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]

This is flat : '72 up manifold.

[gsa612]

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