lbman0007

what type of heads work well with Speed Pro 0.275 hypertectic dome pistons. Can I use 14014416 heads ?

five7kid

iTrader: (14)

Welcome aboard thirdgen.org.

Curious why you're building an engine around a set of pistons. Pistons would be the second-to-last thing I'd pick, right before head gaskets.

416's have 58cc combustion chambers - pretty small for small block Chevys, raise compression a good bit on their own on 350's. Can we assume you're talking about a 350?

Domed pistons are usually reserved for large chamber heads, such as 76cc.

F-BIRD'88

Those .275" dome pistons and 416 heads would be just right for methanol
14.5:1 compression.... Hold on there Newt! We're headed for the alfalfa!!

lbman0007

the engine is a 350 block with std 4.000 bore and 3.480 stroke with 5.7 h beam rods what kind of heads would be best for 40% street and 60% strip with 350 trans and 2.73 gears.

Sonix

iTrader: (1)

If you're going to see the strip more than the street, 2.73 gears have no place on that car at all.

What kind of budget do you have? Is this going to be a budget racer, or a $5000 engine? Or more? What kind of HP are you hoping to hit? 91 octane or race gas in the car?
Naturally aspirated, or nitrous in it's future?

You're willing to get a MUCH bigger stalled converter for that tranny?

lbman0007

Maximum spending is about maybe 4,000 including the car so far i spent 300.00. Hopefully bugdet racer in a limited street or pure street class. i wuld like 450hp to 500hp at the rear wheels. Also, I'm tryin to stay at most 93 octane with an occasional octane boost addictive. No nitrous. What type of stall would you recommend ? Also the cam is a roller cam by comp cams these are the specs http://www.compcams.com/Technical/Search/CamDetails.asp?PartNumber=08-412-8 . Thanks for any advice you can give me.

Sonix

iTrader: (1)

Thats a nice mild street cam.

You'd be lucky to see 300RWHP with that cam, and that's with great heads and all that jazz. I think you could (if you're lucky) get it all done for $3700. That's including things like SFC's, all engine parts, convertor, possibly tranny rebuild, gears, etc.

Either the budget has to come up, or the HP dream has to come way down. Or reliability will suffer big time. Heck, even with virtually no reliability it won't happen.

Is that cam already purchased?

Funny how such a simple question to begin with can balloon...

lbman0007

Yes , i wanted the car to be somewhat of a sleeper. At this part what would you do because the engine doesn't have heads or top end installed so it wouldn't be hard to remove it ? Also i plan on using 1 3/4 long tube headers and delta flow muffler with 2 1/2 outlets.

Sonix

iTrader: (1)

I think you're better off removing those pistons, and trying to sell them. They'll be hard to sell, but they aren't too useful for you.
Get some flat tops, probably forged, since you'll need to rev it high, or hit lots of nitrous to get that power level.

Speaking of, which is going to change, your power goals or your budget?

SpitotRs305

dont even worry about exhaust at this point....

you need to pick a goal... 450HP is doable but at the crank... you may see about 380-390 at the wheels depending on your set up...

next... do you really plan on being at the strip 60% of the time? or more like 80 street/20 strip

forget about using those 416 heads if you really want to see 450HP....
you will want aftermarket heads... and a much bigger cam

something like these heads
http://store.summitracing.com/partde...5&autoview=sku

this cam
http://store.summitracing.com/partde...8&autoview=sku

then build your bottom end to spin to 6500RPMS regularly with about 10.5:1+ CR do not use domed pistons... a flat top will be better... then you will want 4.10 gears and a 3000 stall...

then i would start looking for a new rear end... i cant really see it lasting to long

SpitotRs305

heres a virtual dyno of those heads and that cam... on a 10.5:1 350 with a single plane intake

not exactly accurate but gives you a ballpark of flywheel numbers

Sonix

iTrader: (1)

You assume he has a factory roller block?

I was thinking more along the lines of an aggressive solid flat tappet, and bigger port heads. 210cc ports or something. Or an 18* - 15* head. But that completely blows the budget.

lbman0007

My budget can be a little bit more . Also how would these heads do ? http://cgi.ebay.com/ebaymotors/ws/eB...151357743&rd=1 It ended but it has been relisted. Also, do they make a bigger cam that has almost a smooth idle.
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Hey the 350 block is a factory roller block with 2 bolt mains and no fuel pump hole.

lbman0007

Would this cam be a little better cuz i would like it to almost sound stock . Also i think it would be probably more street than track because i have another one i drive everyday and has the cam and headers and gets me alot of tickets, because of a noise ordinance in my area.

Sonix

iTrader: (1)

You need to list the cam so we can comment.
Those heads are huge, they are for a race only engine. 230cc ports would give you a 4000-8000RPM powerband in a 350. Bad for any street use.

lbman0007

what about this cam ? http://store.summitracing.com/partde...8&autoview=sku

Sonix

iTrader: (1)

That would work quite well.

lbman0007

Also i have another cam lyin around. these are the specs http://store.summitracing.com/partde...1&autoview=sku
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Which cam is better ? Also could i still use the dome pistons and just get those heads with a 72cc chamber ?

SpitotRs305

just to mention that cam is also going to have a pretty mean lope
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a dome piston can increase the likely hood of detonation bad for a pumpgas street car

all of those cams will attract attention... pretty much anything that will get you over 350HP at the crank will attract attention

lbman0007

Even if i use a resonator in place of the catalytic converter and a delta flow muffler

lbman0007

Here's an idea of what i would like the car to do . i maybe wrong about the horsepower level . i would like to run circles around an 2006 z06 corvette . anyone have a COMBINATION FEEL FREE TO TELL ME. I'M still at the starting stages basically shortblock. Also would like to run high 11s to low 12s on the track, without buying a crate engine.

SpitotRs305

sure to run "circles" around a new Z06 you need to completely gut the interior anything you dont need you dont want... then you will need that engine combo i listed above... next you need a 6speed cause you might beat a Z06 off the line but it will always catch you with the 1:1 3rd of the th350
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or atleast the 4L60/4L80

lbman0007

Hey, what about this ? heads http://store.summitracing.com/partde...5&autoview=sku and cam http://store.summitracing.com/partde...8&autoview=sku with the dome pistons cr would be 10.76:1 good enough for 93 octane ?

SpitotRs305

again... those domed PISTONS ARE A BAD CHOICE for a street engine on 93 octane especially with the compression needed to use that cam and with the cast iron cylinder heads... you do know a set of flat top pistons can be had real cheap right... even under $200... why are you insisting on the domes....

you also know that the $449 is for 1 head right...need 2.

plus those heads are a little big for a street 350 that isnt going to make noise if you try and force them to be quite... small cam lower CR they will be even worse and a waste

lbman0007

Well i got the pistons free and they are brand new . Could i have them machined flat ? Or is it cheaper to buy some ?

SpitotRs305

you might be able to have them machined flat... but it would be a waste of money... new flat tops would be cheaper

jeffcj

iTrader: (3)

Sell them on E-Bay and buy new flat tops.

lbman0007

Thats what i'll do because you and plenty others say flat tops are easier to work with. Also, since i'll be using flattops which heads would be better 416's stock or these http://cgi.ebay.com/ebaymotors/New-s...spagenameZWDVW Also, did you see the other crane cam i have with .500 lift/ .500lift . Which cam is better the comp cam cs xr 294 hr-10 or the hydraulic flat crane cam?

jeffcj

iTrader: (3)

The XR294HR-10 http://store.summitracing.com/partde...8&autoview=sku
has .540int/.562exh lift. That's a lot of lift...and too much for those heads you listed I do believe. However, if you've got the $$ to spend, I'd suggest a roller over a flat tappet anytime.

lbman0007

this is the roller cam i already have http://store.summitracing.com/partde...8&autoview=sku is it too small if so this is the one i think i might try this one http://store.summitracing.com/partde...8&autoview=sku

SpitotRs305

those heads would be okay... they seem like they will perform something like vortec heads... good low end... the XR270H10 is okay i would go just a bit bigger on duration though not so much the lift then you could probably go with a set of 3.73s or 3.42s and still be happy with the TH350 on the track... as you would really bring the RPMS down to making peak TQ around 4500-5000 and peak HP around 6000rpms