ok i know i could probaly find the results in search but i will jsut post a new topic and if there is a old thread well post the link. could everyone that is running a 350 carb motor please post there times and there combos. i am trying t odial my car in and i just wanted to knwo what everyone else with the same size motor was running. tunning this thing in is driving me crazy!!! thanks in advanced

 

You could probaly find the results in search

 

Using engine size will not necassarily make for good bench marks. Maybe someone with the similarheads, compression, chassis and weight.

 

ok i can agree to that. so my heads are the perfomer rpm, compression is 13.5, stock chassis tube stuff under it and south side 9 inch w/ 4.30's, weight is around 3200, th 350 trans w/ custom ati 8 inch, cam is a roller .577/.608, 242/262, 114 best pass so far is 11.59 @ 117.

 

FYI:

87 Firebird Formula roughly 3200 lbs. with driver
350 .060, 12.6:1, 5.7 rods, 3.48 stroke
ProAction 220 54cc Heads, 2.02/1.60 valves, 1.5 roller rockers
272@.050, .570 lift solid flat tappet cam
Hurricane single plane intake
750 mighty demon carb
1 7/8 Hedman Headers (Stahl bolt Pattern)
TH400 trans
Edge 9.5 4500 converter
9 inch rear, spool, 4.56 gear
28x9 Hoosier slicks

Best ET-11.19 MPH-123.6 60FT-1.53
Best ET-11.12 MPH-122 60FT-1.52 with same setup except 4.56 gear was changed to a 5.00 gear

 

ok tommyboy you have the bigger heads i think the edelbrocks are like 170cc. i know there hurting me, but you still have .4 tenths on me and that what i am talking about. i do have a 850 dp 1.5 rockers as well, 1 3/4 hooker headers. i was thinking about changing the heads and cam but this is what i have now and i still think theres something left in the car. right now in the carb i have 65 jets in it all around, but the plugs look good a tanish grey color. the exhaust temps are around 1300. to me that seems low. well thakns for the info already any more will help.

 

i think performer RPM heads suck for how much they are. Furthermore, that cam is a nitrous cam isn't it? that is a lot more duration on the exhaust than the intake. Did you try moving timing or jetting up or down to see if MPH picks up at all? Otherwise it's still a nice combo bluebeast. 11.50s is nothing to scoff at.

 

Well judging off MPH you are making about 418 fwhp, your ideal ET is 11.51 - you are close - but I would look for better 60ft's still as a race type car IE: small converter, deep gear, trans brake should be lower than ideal by about a 1/10 od 2 et..

I would look into a different cam as well, unless those are really un effecient on the exhaust - thats a huge split and pretty big lsa as well.. Great super charger cam!
porting the heads maybe - what do those flow??

Still a very good runner, and nice car you have.


My old 350 combo was dart 200cc, 10.0 compression, 3200 stall, 4.10s, victor
jr,750dp, 248/252..
11.87@112.8

 

Yea, definatley get rid of that 114* LSA cam. The ONLY reason why I used one is, when I was getting the motor together, I did not think I would be doing my own proms, and I wanted a cam that would yield good vacuum. A 112* would be better, IMO.

I'm EFI, and my engine is a 436, and it traps a MPH of 118. I should be trapping a 125 MPH. You and I have the same problems...WRONG CAM.

 

i got a great deal on the heads that wh y ihave them on the motor now but now i am seeing the downfall. someone else told me that the cam is a nitruos cam. i guess i will get it as good as i can and look into a new cam and possibly new heads. i am not sure what these heads flow, so i couldnt even begin to tell a number. any cam for recomendations or shold i jsut give comp cams a call and let thme set with up with one?

 

i'm happy with the 106 LSA cams on a N/A motor. comp makes some great circle track cams that have very peaky powerbands that you should check out on their website.

 

went to track again last night a ran a new best of 11.455@119.1 with 60's in the low 1.5's. all i changed was the jets went up 2 sizes with them. i thought i better try something, and it worked. i am going to try one of friends 750 dp just to see what happens.

 

Here is a little trick that will help if you have a solid roller. Tighten up the valve lash .006 to .008 (Max). This should help out a bit. Assuming you have enough piston to valve clearance to try it. Another trick, buy a Moroso or Mr. Gasket electric water pump kit ($60.00). This will add some ponies too.

 

what rpm does the car go through the traps at?

 

its around 7000 at the traps could be 6900 could be 7200 i ma trying to watch the oil exhaust andd tach at the line, yeah there close together but u know how it is sometimes i look at the oil and forget the rest and sometimes i look a the other ones. but anyway its around 7000.