k guys ive got about $600. im not too sure where to invest this money. what i have is a 3350 lb with out driver 1972 chevelle. here is what i got:
355 9.5:1 vortec heads
cast crank and rods and hyperutectic pistons
rpm cam and intake
3310 holley 750
1 5/8 headers w/ 2 1/4 pipes thatdump before axle w/ flowmaster 3 chambers
electric fan
th350
2400 stall tci breakaway w/ anti ballooning plate
373geared 10 bolt w/ eaton posi.
dont ask me why but this combo clicked off a best of 13.12 @ 103.4 w/ a 1.91 '60 time on 28/12.50 etstreets

no i ask what would be your next step?
im thinking the bottle and 3in dual exaust but i want your opinion

Id say deffintaley go for the bottle! Thats about the ET im predicting for my '72 and will deffinatley be throwing the bottle on it for some little extra fun :D Also, maybe try cutouts right after the headers, I have a electric ones that seem to help out my top end quite abit.

600 bucks AY?

Well for that amount of money I would have to say that I would get a 10inch ATI Treemaster.
It will probably be the best bang for the buck,short of NOS.

I just got one from ATI on sale for a little over 500.

You didn't mention anything about a shift kit???

How about removing the heads and getting some porting done?

If those don't flaot your boat...
How about a cam change.We have all heard how the RPM cam really doesn't care for that low of a compression.How about the Comp XE274H?

Or remove the 3310 sell it and get the Holley 750HP,the DP of course.

Then there is that 2 1/4 inch exhaust...

As you can tell I'm staying away from the NOS.

I like the porting idea!

What cam are you running? That is almost identical to my sons 355,except his is in a 81 Chev. p/u and runs 13.50-60's all day. I know the aerodynamics have to come in to play. I'd go for 4.11's or the bottle.

heads have a little clean up done around the valve seats, the trans is pretty built with a shift kit heavy duty clutches ect., the 3310 only lost 3 hp to a 750hp on the chassis dyno. i just put the cam and converter in and dont really want to change them because i have a solid roller sitting on my desk waiting for my 400 sbc to be done which i haent even started on ;)

if your going for the bottle you will need to spend alot of your money on forged pistons or your motor is going to be waisted

Juice it! Keep it around a 100 shot, make sure you have enough fuel, and take a few degrees outta it....and you'll go DEEP into the 12s. Your setup is just beggin for a little gas smile.gif

How bout and X pipe ?

nitrous is definately the quickest, easiest, and cheapest go fast mod that you can make right now, IMO. convertor would be the second best investment. i had a similar combo with my 71 and it picked up about a tenth going from a 3310 to a 750dp. BTW, what are your 1/8mi times on those runs? and how did you get your car so light?
if you do use nitrous, please be very conservative with it. unless you gapped your top rings for nitrous use, those hyperuetectics won't like it and will blow the top ring land off of the piston.

Originally posted by m71:
nitrous is definately the quickest, easiest, and cheapest go fast mod that you can make right now, IMO. convertor would be the second best investment. i had a similar combo with my 71 and it picked up about a tenth going from a 3310 to a 750dp. BTW, what are your 1/8mi times on those runs? and how did you get your car so light?
if you do use nitrous, please be very conservative with it. unless you gapped your top rings for nitrous use, those hyperuetectics won't like it and will blow the top ring land off of the piston. I agree whole heartly

Originally posted by 300hp:
3310 only lost 3 hp to a 750hp on the chassis dyno. I agree that 3HP ain't much.It is not a question of the HP though,it's the secondary actuation.Much quicker.
DP's make the engine respond much better and when correctly set up will accelerate the vehicle quicker through the 60ft,that leads to a quicker pass all the way down.

And by the way who's chassis dyno are you going by?
Was it in a magazine pehaps?

Also the intake of the Vortec head doesn't nead much.You are probably fine there.The exhaust is another story.That is where most knowledgable porters will concentrate there efforts on this head.

chassis dyno service was done here in town on a dynojet where it made 304 hp and 363 ft lbs at the rear. i did gap the top rings looser than spec because i was thinking about using nitrour earlier. honestly i dont know why my car is so light. when i weighed it last it was at 3375 w/ bench seat, sbc, th350, weld wheels, manual steering and brakes. since then i put in a cell, pulled out the heater and put on alluminum brake drums. im going to do the racing seat thing when she needs a cage. o and my 3310 has the choke horn milled off, its 4150 style old one with secondary metering block and powervalve. i took it apart and literally polished the venturies with a dremel tool. i know exaust will probly help a little and jegs has those mandrel bent 3 in systems for $175 so i think thats the first thing

Good to see you moving forward with your combo. You've gotten some great results so far. I say definitely get your exhaust done next.

How about tuning, how much have you done? What do you have for a distributor and where is it set-up at for a timing curve? How is your carb set-up for jetting, etc.? How about some chassis tuning, shocks, bars, springs?

I hate the NOS idea! I'm an N.A. guy myself.

If you're going with a 400, put the 600 into that and get it under that hood, otherwise i'd recommend getting more tools.

That combo is goooooooood. N2o or just save the money for the 406 or a rainy day.

Re-reading the post I thought of maybe 1.6 roller rockers? Would you be able to use them on the 406? I'm impressed with the amount of power you are getting to the ground and the et. That thing is TUNED. graemlins/beers.gif

i would go with a 1.6 rocker but i cant do to valve springs not being good enough. how much of an improvment would a 100hp shot help me?

Get your 60 fts. down into the 1.8X or better and you'll have an easy 12 second timeslip.
I think you're tires are too tall for those 3.73's
IMHO
Impressive performance,I like your combo graemlins/thumbsup.gif

thanks for the compliments guys, the tires i was borrowing from my cousin, they are to tall. what about stepping up to a bigger intake manifold? the next one for me is a super victor.