[NeighborsComplaint]

Originally Posted by Tim Corcoran

No matter what you do with your converter and gears, that cam you have in there with your low static compression is way wrong. If you had a time slip with the old cam and ran it down the 1/4 mile now with the new one you would be surprised how much slower it is now. Lots of guys have thrashing machines that won't even run a 13 in the 1/4 mile because they think a big cam will make their car faster. I would read Big Mikes post above about 10 times before you go out and buy a big converter to try and mike your combo work. You need to plan out a well balanced combo around your budget that will work with your static compression ratio with a cam that will build some dynamic compression.

Only his timeslip will know for sure. I bought my '71 GTO from a guy who raced it. It had 4:56 gears, bolt on ladder bars, a 10" TCI Chevy convertor, pop-up pistons, Torker I intake, 850 Holley DP, a single pattern Comp 305 Magnum cam and 3 tube headers. All wrong, but he had mid-11 second timeslips to show for it.

I think the OP is going to find that what he has lost on the bottom he will gain back at the top and run about the same overall but with a different attitude.

[Michael G]

Originally Posted by Tim Corcoran

No matter what you do with your converter and gears, that cam you have in there with your low static compression is way wrong. If you had a time slip with the old cam and ran it down the 1/4 mile now with the new one you would be surprised how much slower it is now. Lots of guys have thrashing machines that won't even run a 13 in the 1/4 mile because they think a big cam will make their car faster. I would read Big Mikes post above about 10 times before you go out and buy a big converter to try and mike your combo work. You need to plan out a well balanced combo around your budget that will work with your static compression ratio with a cam that will build some dynamic compression.

A 2400-2600 rpm converter that flashes to 2800 is a big converter?
You gotta be kidding me. LOL

If he has any chance of making this cam work with this combination or any other it sure wont be with a stock converter. I'm surprised it even idles

[stockapearing455]

1st run 13.89 at 101 with this cam.
Stock can ran a best of 13.9 at 97, but typically ran low 14s. So there is some improvement. I'm going to make another pass in prob an hour.so pucked up some mph. 60 foot was a horrible 2.37 hooking up with stick converter .

[stockapearing455]

Second run 13.72 at 101.49

[Stan Weiss]

Originally Posted by stockapearing455

Second run 13.72 at 101.49

Nice. What was your 60 foot time on that run?

Stan

[stockapearing455]

A whopping 2.22. BTW my dads trans am 455 ran a 12.8@102 so I'm trapping the same mph as him. He's got a lot of torque though.

[grandville455]

Originally Posted by stockapearing455

Second run 13.72 at 101.49

Pretty respectable for a 8:5.1 400 with that cam! Congrats! Get a better convertor and some more gear and it will really pick the 60 up

[PONTIAC LARRY]

It will need a 10" converter , starting off decent I would say.. probably go low 13's with only converter

[Skip Fix]

Sounds good. That 228 single pattern in my TA ran decent for low compression 2.56s and barely hitting third in the 1/4. Didn't feel like I lot bottom end on it

[NeighborsComplaint]

A good convert will knock .20 of your 60' times. A Hughes GM25 will work well for cheap.

[77 TRASHCAN]

Originally Posted by Cliff R

We're currently building a 406 here with the Crower 60919 camshaft which has similar specs. We're shooting for 11 to 1 compression, and put the intake lobe at 107-108 centerline, which is what those camshafts need to be effective in the smaller engines.

At 8.5 to 1 compression they never make enough dynamic compression to work very well anyplace. The engine will not idle well, and be "soft" below about 3000rpm's. It may eventually pull pretty hard in the upper mid-range and top end, so you can run down the Honda Civic that just put two or three box-cars on you from a stoplight! Not trying to be a smart-ars, I've had several later model low compression 400's in the shop to tune with that same cam in them, and they are horrible.....FWIW......Cliff

Cliff,
Can you elaborate any more on the 11:1 406 your are putting together???
iron heads? type?
Alum heads?
proposed octane gas to be used in it?
Thanks
Jeff

[Cliff R]

We're using 1969 #46 heads upgraded with 2.11/1.77 valves and screw in studs. Heads will be milled for more compression, to effectively use a cam with 304/314 duration on a 113LSA. It will run fine on pump gas with correct tuning, 92-93 octane, as the RAIV clone doesn't make that much dynamic compression in a 400 build.....Cliff

[jamaca85]

I used to run the comp 280 magnum cam in my 400, great cam.. but the motor had a set of 62s..with the 6xs I wouldn't know how that set up would act with the 280...

[77 TRASHCAN]

Can different cam phasing help such a combination as this (much)???

[se428bandit]

I think you could cut a few more tenth off with a 2800 stall. 20 years ago i had a 8.5 comp 400 with 6x heads,744 cam adv 2 degrees, HO alum intake and RA cast iron manifolds, it would run 13.40@ 104. With a stock conv it wouldn't run in the 13's.

[stockapearing455]

I checked compression they are all around 125 except I have #2 cylinder at 100 psi.

[77 TRASHCAN]

Originally Posted by Cliff R

We're using 1969 #46 heads upgraded with 2.11/1.77 valves and screw in studs. Heads will be milled for more compression, to effectively use a cam with 304/314 duration on a 113LSA. It will run fine on pump gas with correct tuning, 92-93 octane, as the RAIV clone doesn't make that much dynamic compression in a 400 build.....Cliff

Cliff,
What kind of car this build going in??? (weight?)
Gear ratio?
Anything special about the ICL???
Valve spring specs???
I assume this can be a 6500 RPM engine???
Rhoads lifters???

Thanks as always...
Jeff

[stockapearing455]

It now idles better and accelerated better. Took it to the track and it took me down to a 13.25.

[kyle_blake]

Sweet! nicely done! great job working through it!

[Ventura455]

Originally Posted by stockapearing455

It now idles better and accelerated better. Took it to the track and it took me down to a 13.25.

Nice. Glad your friends converter worked out for you.