Portmaster

The intake is going to hurt you worse than too big of a carb. The big open area (plenum) under the carb and short runner length will hurt the performance below 5000 rpm with that stock 302
and with only 500 rpm left of effective rpm there will no gain but only frustration on why you can't get any low end power. I have a very stout 347 and I almost had to flip a coin between a Vic Jr and a RPM air gap. Because I have 3500 stall, lots of torque and steep gears the Vic Jr won the toss. If I had went with 3:73 gears in my car I would have a ported RPM Air Gap on it. Your car with stock engine, stock heads would do better with a regular performer intake than about anything else. Your engine is good to just over 5000 rpm and the Edelbrock Performer is good to around 5500 on a stock engine. Personally I'd rater over carb it than over intake it where I had to make the choice.

My advice is quit trying to convince yourself it's going to work well and either keep your EFI or buy something that matches your set up. I use to buy a lot of used Victor Jr's from guys who thought they could pull of this same swap on small block Fords and small block Chevys. You can work around the carb a little because they are so many ways to adjust it but you can't adjust the intake manifold to get good low end throttle responce where you need it. The "Tip in" responce is what you need on a low power car. Thats the power you get like right as you leave a stop light and is important on a street car.

You may be able to get it to where it's OK to you if you like Hondas leaving you at stop lights but I'm telling you that it isn't right for your car. When you throw that thing on your car and end up with a car that won't pull itself out of it's own way and gets 9 mpg you'll know what I mean. I've seen this thing so much over my career that it's not even funny. I've been inside a shop for 50 years, I've been doing performance work since 1968 for the public and when it comes to carbed cars I've seen just about everything. Two rules always come through. On 99% of true street cars a good dual plane on anything below 400 cubic inches rules the street and there are very few small block cars that run the street that need any bigger than a 650 cfm carb.

Let take your car for example. If your car stock 302 runs up to 5500 rpm (which with stock heads it's about done) and you have some bolt ons (headers, the right intake, a small perfromance cam) and your cars engine is running at 85% Volumetric Effeciency (which is being generous) your car would need a carb that flowed 409 CFM. For you car a 500 cfm carb would be plenty.

The formula for this is
302 cubic inches X 5500rpm = 1661000 /3456= 480.61 X 85% VE=408.52 CFM

A 600 cfm carb would still leave you room for better heads and wouldn't over carb your car.

Now do what you want but I hate to see you go though the trouble to go through this swap only to come back wondering why you car has no low end power.

tommiesgt

just so everyone knows i was the one who was interested in trading for his efi stuff, i was aware that the carb was going to be too big for his setup and told him but i didnt know about the intake, i think thats why he was planning on trading for the 600. just dont want anyone to think that i was trying to rip him off. my question is though is the intake and carb to big for my setup to the point that it is hurting me? I bought the engine already built so im not sure of everything but i was told its a tfs 3 cam with trick flow high ports on a 308 with 9.7 to 1 comp. also has a 125 shot of nitrous and 4.10s

mjr46

how does your set up run??? any et on it???

tommiesgt

been in the mid to low 8s in the 1-8th no nitrous since the nearest 1/4 mile is over 2 hous from buffalo. Didnt get to drive it alot this summer maybe put 12 passes on it. I guess it doesnt really matter now im in the middle of doing a 331 for it and was planning on going efi

Portmaster

Thats a lot of Cam, intake. carb and head on a 308. A mid 8 1/8 pass should put you into a mid to low 13 second range. Not real spectacular for that combo of parts. Slide a 347 under those parts with about 10.5 compression and you would really wake that thing up.

QuarterHorse00

I had a 306 that n/a had WAY too much head/cam and ran 12.0's all day long at 113-114. As soon as I put a 200 hit on it she trapped 130's but I never got the short time down. My one good launch ( a laughable 1.60 short time )I coasted to a 10.89 @ 113...... I got rid of the car before dialing any suspension in.

It's a combination as a whole. Look at what you want out of the car and build for that. It may not be the perfect combo right now, but gather all of your pieces and THEN put it together to get a big smile on your face.

tommiesgt

im redoing the motor over the winter anyway. was thinking of going with a supercharged 331 or 347 and would like to be somewhere in the 400 hp range that the wheels so any reccomendations on a good stroker kit?

Joel5.0

Check these options......

tommiesgt

thanks they have some pretty good prices on there.

toofst4u666

if you can sit the carb up high enuf with like a 2in spacer and a highrise intake and you jet it down the 750 will work fine