got a 350 im rebuilding for a 4000 lb car with 3.08 gears, im wondering about how much compression i can run with these cams and my heads on 91-93 octane?
heres my parts list, im looking for good low end torque and mid range its just a cruiser not a race car, i am just looking for better performance then the factory gross rated 255hp and 365 ftlbs.
Im ordering my parts from northern auto parts so i am a little limited on cam choice.
4000 lbs and a 3.08 gear will make a big load on the engine.
So, I would say......
9:1 with old school iron heads,
9.5:1 with iron vortecs (as they need less ignition timing)
and 9.5 to 9.75:1 (maybe 10:1) with aluminum heads.
I would avoid xe cams as they have very aggressive lift rates for a flat tappet cam which can make them more prone to go flat and make noise. Plus you don't need extra exhaust duration with those heads and with headers.
I would use an old school 260H and get a more durable cam but at the expense of a little power. 260/260, 212/212 at 0.050".
ok ill probably use that 260h cam then makes sense thats its not as prone to going flat, thanks for the answers, this may be a newb question but whats a rough estimate of what compression would be with flat tops and a 63 cc chamger on a 355
you need to get the exact piston volume from the piston specs and measure the deck height (with a piston installed). Would also be a good idea to verify (measure) the head volume.
I would go with a .040" quench distance- it'll help all the way around. And a slightly larger cam with a 2500-3000 stall. Something around 220 duration with a relatively wide lsa- 112 or so will make for a good cruising setup, a tighter lsa and a little less duration will be better down low but require optimal tuning and 93 octane.
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Hot Rod Forum
2.2M posts
175.6K members
Since 2001
A forum community dedicated to hot rod owners and enthusiasts. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more!