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Discussion Starter · #1 ·
Im planing to build a 412 cid engine

bore 4.155 stroke 3.800

Single plane intake

cam 12-678-4

so how big intake runners do i need im thinking AFR heads

will the 195s bee to small? do i need 210s?
 

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Is this going to be a high compression engine or a pump gas engine. If you check what is run on 383's and 400's most run large intake runners so I would go with the 210's. Years ago I built a 383, 9.5 compression, mechanical roller cam 240/250 duration, Victor Jr. with a 750 Speed Demon. I went with the iron head Motown 220's. The higher the duration the bigger the heads. If it's a street only car I would use the 195's.
 

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http://www.backfalt.fi/indexse
Joined
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263 Posts
Discussion Starter · #3 ·
Is this going to be a high compression engine or a pump gas engine. If you check what is run on 383's and 400's most run large intake runners so I would go with the 210's. Years ago I built a 383, 9.5 compression, mechanical roller cam 240/250 duration, Victor Jr. with a 750 Speed Demon. I went with the iron head Motown 220's. The higher the duration the bigger the heads. If it's a street only car I would use the 195's.
11.4 to 11.5 pump gas
it wil just se the street ven its rime for car inspection. 30km on the street every year!
 

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CR is a small part of an engine build.I would stay under 11 for the 94 octane gas that I can buy.Intake runner size really depends on HP you need/want and what you call good manners if it matters? I use 227 cc intake runners and it drives good. I also use a medium solid roller and 950 cfm carb.434 cubes...for me
 
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