Footbraker67

Im currently building a budget minded bracket raced 67 chevelle. Car weighs in at 3,000lbs with me in it.
The specs...
-2004 LQ9 with 90,000 miles
-Holley single plane intake
-950 carb ON METHANOL
-ARP rod bolts
-ARP head studs
-317 heads
-8' torque convertor that would stall 4,500 rpm behind my old small block.
-Powerglide
-4:88 gears.
Im needing help on deciding which cam and valvetrain would be best for my combination. I called Comp Cams and told them all my specs and they recomended the 54-461-11 (.239-.247 duration, .624 lift, 108 lobe sep). I have read alot about camshafts for this engine and that sounds like it might be to big for what im going for. I dont want to get into any piston to valve clearance issues. Also im not sure as to what to do on the valvesprings. Any help would be greatly appreciated guys. Thanks

lblevins

iTrader: (4)

MS4 with 243s and be done.

lblevins

iTrader: (4)

I ran a hwy gear in my nova full interior street car and ran an 11.7@124 with a 2.1 60ft with a lq9, ms4 243s and 3600 stall th350. I daily drove it for along time with that cam no problems and miss it but I went to an ly6 with ls3 heads and bigger cam with forged bottom end everything else the same.

Footbraker67

Are there any clearance issues (piston to valve) with the ms4 cam?

speedtigger

iTrader: (16)

What you need is a camshaft that will have the necessary piston to valve clearance without fly cutting while still having the correct valve events to be used a single plane intake manifold and factory style heads. Ideally, you would want to fly cut to get the perfect cam, but you will do really well with these specs and it should clear fine as long as you mill no more than .010" on the heads. But, check the piston-to-valve clearance anyway.

232/244 .629"/.595" 111+4

This cam will love your converter and like to be shifted between 6600-6800. A lot of us run our stock short blocks in this range with good longevity.

I recommend Cam Motion. I think their quality is just plain better. http://www.cammotion.com Ask for Danny and tell him SpeedTigger sent you. Danny will get you set up with the correct springs too.

tf705

iTrader: (1)

Don't put a ms4 in a carbed motor, listen to speedtigger

dogsballs

lol, methanol but no flycutting and stock heads? interesting.

fly-cut and run bigger cam. not that hard to do, factory pistons are pretty thick, opens up a lot more options cam wise.

Footbraker67

Yea its a little different i know. Im running methanol for many reasons. 1- it runs cooler than race gas
2- its cheaper than race gas.
3- ive seen guys pick up 6 tenths just by switching to methanol.
4- its more consistent than race gas. in bracket racing thats the most important thing.
and im leaving the heads stock for now mainly because im trying to save as much money on this thing and just get it running for this season and have a motor i can build on as i go.

fast89stang

iTrader: (2)

6tenths? Their gas carb must have been WAY off. LOL. Ive ran both back to back, my gas carb is off, but only seen about 1.5 tenths over gas. if i was gonna run something like Alcohol or E85 i would get compression up as high as i could to at least use the power of the fuel to benefit me. Innefficient cylinder heads also will gain more from alky usually. the more efficient the head, the less the motor will gain usually. I dont think you will have a efficiency issue with LS style heads. Bump the compression, get a custom cam, you wont be disappointed. My motor has less than 10-1 and runs 6.2s.