So something I was wanting to start 5yrs ago officially began today. I have a short block 427 small block chevrolet on the way, should be done in about 3 weeks. It is a Dart Little M block, 4.125 bore and 4.00 stroke. It has Eagle forged crank and forged Eagle 6" H Beam rods, JE flat top pistions, will be about 10.35:1 compression.

I'm looking ordering a set of AFR 220 cc heads(pretty set on these), and will run a Super Victor intake with a 950 cfm Quick Fuel carb (open to suggestions). I also am looking at a Erson solid roller cam, something around 270-280 duration at .050 and .670 - .680 lift, 112 lobe center. I am looking for cam spec suggestions as well.

This will be going into a 69 Camaro (3300lb with me) that has run 10.90s on a VERY mild 406 sbc with a 125hp N20 shot. I currently have a 3.73 gear in a Strange S60 (Dana 60), looking to swap to a 4.10. I have a TH350, looking at a 4K stall. The suspension works well, I've ran 1.46 60ft with the old combo.

Any suggestions on cam and carb/intake would be appreciated. Anyone with a similar engine and weight car, let me know your power/timeslips if possible.

Thanks!

 

your cam will need a small base. for the 427 sbc. if you order it from comp cams. tell them what cid and block. and you want a small base cam.(they should know)..but you never know

with under 11.1 on the CR. i would stick with a cam in the 620 lift ball park(just me)
and 250 in the Duration.

but my street car is a 427 12.5 to 1 and a mech roller with EFI
with 4.11s

remember you will need a oil pan to clear the 4" stroke
i use canton (best deal)

and dont forget the lifters if you go mech and use the dart block you will need .300 longer lifters. unless you have the block cut for shorter ones.
this is just a start..

 

Glad you have your new project lined up, i am probably going 427 next year if i can afford it, but i i wll be using a 6.0 LS block with a 4.1 stroke crank.

With the right top end and cam, you will get 10s all motor. But that cam is a true race grind, something about 254/260 @.050 would work bad **** and be streetable as the cubes will eat up allot of duration.

 

Considering it sounds like a dedicated drag car, arctic is right on the money suggesting a smallish cam. There should be no reason why you wouldn't add a full point to the SCR especially if you have solider roller in mind. Anything I've seen with that duration would result in fairly low DCR (around 7 to 7.2:1) using a 10.35:1 SCR. Rough calculations show you could tolerate over 12:1 when your advertised duration gets past 300 degrees. You may also consider tightening up the LCA. 112 degrees is quite a bit for a carbed 427. Conventional thinking is that the more an engine becomes undervalved (as in the case of Gen 1 SBC's) the tighter the LCA needs to be.

 

Thanks for the responses....I actually went with a little more compression - it will be 11.06:1, the block is being zero decked and 3ccs milled off the heads. I spoke with Tony Mamo from AFR, and I think I'm fairly set on the cam. Its going to be about 260/264 at .050 and .660-.670 lift - these heads are good to just over .700.

I do have a stroker pan, and I'll double check on the lifters.

I am undecided on a carb (probably go 950cfm) and headers...I have a set of Hooker Super Comp 1 3/4 primaries w/ 3" collectors, but I am considering getting the 1 7/8 w/ 3.5 collectors.

4.10 - 4.30 gear is also being looked at.....

 

i think a 1 3/4" primary will **** that motor off...it's going to want some big primaries

 

i'd be thinking dominator or a big big 1050+ 4150 and 2" primaries

 

x2 on 2 inchers

 

If that's the thinking (everything bigger!) then your 11.3:1 SCR is a good decision.
Double check your thinking on the 112 LSA. If you get your SCR to the 11.3:1 level, a 300/308 advertised duration camshaft on a 112 LSA and an ICL of 108 will yield about a 7.9:1 DCR. Tighten up the LCA to 108 (with a 104 ICL) and the DCR jumps to 8.2:1. A 106 LCA will get you almost 8.4:1.
That will make HUGE torque.

 

what size chambers on the Heads???

 

The OP doesn't say however the afr 220's have 64 or 75cc chambers. With a 3cc reduction, it works out to 72cc. The 64's would never work on the 427 with zero decking and flat top pistons.

 

Skinny is correct - they are the 75cc heads with 3cc removed, should give me 11.06:1 compression. I will look into the LCA...

 

not running over 6500rpm 1 3/4 tube headers should be fine.
just run 2x 3" out. works for me

 

what does your car run? seems in most circles, you intake and exhaust would be too small...also seems that a 427 with good heads/cam combo with the properly matched drivetrain should run bottom 10's in a 3200lb car...

 

solid roller and not over 6500? I would imagine you'd be able to spin it 7k+, I spin most of the solid roller combos I toss together until 7500 at least typically. 6500 is hyd roller territory with the right combo.

 

You will be fine with the 1 3/4 headers. You are in the ball park for the cam also. As far as the carb goes a new holley 950 or a 1000hp will work good, and I say a new 950 because holley just changed them and it will know flow the 950 cfm as the older units did not. As for an intake bigger is better it is hard to find a sbc intake that can flow the cfm of the newer better heads that are offered. You will need something life a holley keath dorton or supper vic and it will need some porting.

 

3450lbs w/me i it.
10.40's thats with out the fogger nos. 1 3/4 works for me
shifting just under 6500. its all about TQ and lots of it...
no need to spin it up any more with the right parts.