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Topic Review (Newest First)
09-26-2012 03:46 PM
bygddy
Quote:
Originally Posted by Cridder View Post
Ok 15cc for the pistons, 58cc heads, tin gaskets + 025 in the hole = 9.78:1
Figuring in minor de-shrouding, and they were cut at some point, I'm guessing your pretty close.....sounds just about right for a nice street motor to me!
09-26-2012 06:12 AM
Cridder
Compression ratio 350/305

Quote:
Originally Posted by bygddy View Post
Dished, factory,..........and if you see my stupidity thread elsewhere, I discovered that while yes the heads were milled, it may not have been that drastic, as it turns out my "free" almost brand new procomp "performer" knock off, simply was garbage and didn't fit....!
Ok 15cc for the pistons, 58cc heads, tin gaskets + 025 in the hole = 9.78:1
09-26-2012 04:07 AM
bygddy
Quote:
Originally Posted by Cridder View Post
No where in this thread is there a mention of piston type, from the picture they look like flat-tops, there was mention of heavly planning the heads, so based on 55cc for the heads it calculates out to 11.44:1.. cranking compression will be well over 200 psi.
Dished, factory,..........and if you see my stupidity thread elsewhere, I discovered that while yes the heads were milled, it may not have been that drastic, as it turns out my "free" almost brand new procomp "performer" knock off, simply was garbage and didn't fit....!
09-26-2012 01:23 AM
Cridder
Compression ratio 350/305

Quote:
Originally Posted by bygddy View Post
Mine runs excellent, so far, only on 94 tho....I'm very curios as to my compression.....I know the heads were cut at some point, but didn't know how much until I went to install my intake, and with the 1094 headgasket, the intake bolts do not line up! Close, very actually but not enough to get one side in if the other has any bolts in. But the intake gaskets looked good with no surprises....is there a way to calculate compression based on say,cranking pressure or? I'm dying to know what I have.....and it seems I may have dodged a bullet with ptv by choosing a small cam ......I have had it to 6000 g's with no issue.....hmmm
No where in this thread is there a mention of piston type, from the picture they look like flat-tops, there was mention of heavly planning the heads, so based on 55cc for the heads it calculates out to 11.44:1.. cranking compression will be well over 200 psi.
09-26-2012 12:56 AM
Cridder
hoggin the bowls

Quote:
Originally Posted by F-BIRD'88 View Post
Here is a pic of a fully ported 083 head.
You can see there is serious flow paths around the guide now.
These are not my heads but heads done at home by another guy who did not listen to the arm chair experts.
These 083 heads flow over 270cfm (2.08" valve)

When done generously @HOME with just a 1.94" valve they flowed over 240cfm.
At first glance they look like well ported heads, i don't like the duel flow paths philosophy, this type of head has a poor short side radius and as a result has poor flow on the bore center side of the valve, the typical fix is to bias grind the bowl and try and turn the air away from the wall side, smilier to a swirl port, material should not have been removed from the outside wall side of the bowl, if these flow 270 cfm it looks as though it will all be out the front, combustion efficiency and low speed will probably be poor.
09-24-2012 11:24 PM
smallblock383
Quote:
Originally Posted by bygddy View Post
Mine runs excellent, so far, only on 94 tho....I'm very curios as to my compression.....I know the heads were cut at some point, but didn't know how much until I went to install my intake, and with the 1094 headgasket, the intake bolts do not line up! Close, very actually but not enough to get one side in if the other has any bolts in. I wound up using the die grinder to elongate the holes slightly, this seemed to work. Tonight I actually pulled the intake as I was an idiot and used the rubber end gaskets and one slipped out so it was leaking pretty bad. But the intake gaskets looked good with no surprises....is there a way to calculate compression based on say,cranking pressure or? I'm dying to know what I have.....and it seems I may have dodged a bullet with ptv by choosing a small cam ......I have had it to 6000 g's with no issue.....hmmm
I WENT WITH THE 305 H.O CAMSHAFT BRAND NEW AND FAR AS compression FOR STOCK 350 IT SHOULD BE 10:1
09-24-2012 09:28 PM
bygddy Mine runs excellent, so far, only on 94 tho....I'm very curios as to my compression.....I know the heads were cut at some point, but didn't know how much until I went to install my intake, and with the 1094 headgasket, the intake bolts do not line up! Close, very actually but not enough to get one side in if the other has any bolts in. I wound up using the die grinder to elongate the holes slightly, this seemed to work. Tonight I actually pulled the intake as I was an idiot and used the rubber end gaskets and one slipped out so it was leaking pretty bad. But the intake gaskets looked good with no surprises....is there a way to calculate compression based on say,cranking pressure or? I'm dying to know what I have.....and it seems I may have dodged a bullet with ptv by choosing a small cam ......I have had it to 6000 g's with no issue.....hmmm
09-21-2012 01:44 AM
smallblock383 Guys i got the motor in runs great off 87 octane no pinging
09-20-2012 12:31 AM
F-BIRD'88 somewhere between 18 and 26deg base at idle.

You can get special 10° and 14° advance bushings for the MSD billet distributor
here Tuning MSD Distributors

Or make your own.
09-20-2012 12:16 AM
TimoFinn
Quote:
Originally Posted by F-BIRD'88 View Post
Here is another pic of a nicely done full HOME ported 4416 head.
again see the strong flow paths around eh valve guide boss.
These heads will make strong power on a street motor
with a strong torqy power band well past 6000rpm.
With other good supporting parts. Like a 750-800cfm carb performer rpm or vic JR
healthy hyd or street strip solid lifter cam long tube 1-5/8" headers and 2.5" ex.
Nice looking heads you have there, it`s great to see somebody willing to do a port work to factory heads and get good results.
Too often people just tell to scrap everything original and buy chinese crap just because some magazine or internet says that they will outperform your old junk.
Is the idea of `hot rodding` (i really don`t like that word) to buy all things ready or to build it yourself and be proud of what you have achieved.

I too like AFR heads, they are like a piece of art and perform really good, but there are some `entry levelŽaluminum heads that are like crap out of the box.
Build in china no matter what the cardboard box says where they are proudy made and colourfull box with stars and stripes printed in it.

I really enjoy your writing (F-BIRD`88) and will do a distributor in our Camaro
the way you have been adviced to a lot of people, i`m not sure if i can get enough advance limited with the bushing that came with MSD distributor to wake it up at lower rpm`s.
It (SBC 383) was dynoed and dyno guy found that it liked 34 deg to be best to this engine. 500 hp 500 ftlbs with crane 119661 roller cam 230/238 @ 050
10,8:1 comp, AFR 195 heads
I think about 20 deg of initial, does it sound good?
09-19-2012 10:24 PM
bygddy Meh, that's alot of work for something that will just end up as garage art......tonight was productive, starter in (love a factory mini starter!) Cam in, timing chain on, heads on, .....only snag was unrelated, I tried to open the butterflies on the Carb but they won't move, I'm guessing they are hung up on the 4 hole spacer so will have to pull that apart and see what's up...oh, gonna start a new thread for Carb help....
09-19-2012 12:20 PM
F-BIRD'88 any all relevent meaningfull numbers are stamped on the end of the cam.
Any numbers cast on the core don't mean much.
If you want to ID it measure the lobe lift with a caliper
or stick it back in and degree it @.050"
09-18-2012 09:23 PM
bygddy Edit. 6930
09-18-2012 08:29 PM
bygddy
Quote:
Originally Posted by stroker_SS View Post
I think phenolic is the word your looking for. Good luck with the build.
!!! That's it lol....thanks....on a side note, any way to I'd the cam I just pulled out? I can see a stamp that reads "gm29" between a couple of lobes, then under the next lobe I believe it says 6920? Any clue?
09-18-2012 06:42 PM
stroker_SS
Quote:
Originally Posted by bygddy View Post
The spacer I have is the......that fkn plastic word, can't remember what its called lol, but its a plastic 4 hole for the Qjet
I think phenolic is the word your looking for. Good luck with the build.
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