2 barrel to 4 barrel

ponydude · 07-17-2001, 04:13 PM

Im thinking of installing a 4 barrel intake on my 1987 302
was told that i should change the cam because I would loose all the 4 barrel power if the proper cam is not in...
Is that true?
Is there a number to look for on the cam to say it works with a 4 or 2 barrel?

Gearhead999 · 07-17-2001, 07:40 PM

You don't have to change the cam. Try the 4-barrel first. Get a 600 cfm carb. Either an Elderbrock or Holley. Your choice. I prefer the Elderbrock for street driving. Easier to tune and stays in tune longer. My $ .02. You may like how it runs.

When you want a cam, call Crane's hot-line. Tell them what you have and what you want it to do and they will recommend proper cam.
Most cam's that are installed are to big. Yeah, bigger isn't always better here. Ask for Tony at Crane, he knows what he's talking about.

[This message has been edited by Gearhead999 (edited 07-17-2001).]

07-17-2001, 09:14 PM

I'm pretty sure on just about all engines that they put the same cam in original 2-bbl engines that they did in original 4-bbl engines. Is that right?

------------------
'69 Coupe with 351W
=========================
Edelbrock RPM intake, Edelbrock RPM cam, Edelbrock 750 cfm carb, Edelbrock lifters, Edelbrock double roller timing chain, Edelbrock valve springs, Accel coil, Moroso Blue-Max wires, Hedman headers, 2 1/2" pipe, glasspacks, Flex fan, Lakewood traction bars, C4, 9" Currie on order, 290hp-stock heads
=========================
The Surgeon General didn't say anything about smoking your azz!!

thunderbolt · 07-17-2001, 09:40 PM

Ponydude: What induction system do you have on the engine now? By 87, all 302's should have been fuel injected. As for the carb, you won't have to worry about the cam mismatch. Otherwise the most popular swap in the history of cars wouldn't work without major modification. True, to get the most benefit out of a 4bbl, you need some more parts, but these include things like exhaust, ignition, and heads in addition to carb. You will be just fine switching to a 4bbl.

07-17-2001, 04:13 PM	#1
ponydude Registered Member Join Date: Jul 2001 Location: Les Cedres Posts: 7	2 barrel to 4 barrel Im thinking of installing a 4 barrel intake on my 1987 302 was told that i should change the cam because I would loose all the 4 barrel power if the proper cam is not in... Is that true? Is there a number to look for on the cam to say it works with a 4 or 2 barrel?

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07-17-2001, 07:40 PM	#2
Gearhead999 Registered Member Join Date: Sep 1998 Location: Oviedo, FL Posts: 992	You don't have to change the cam. Try the 4-barrel first. Get a 600 cfm carb. Either an Elderbrock or Holley. Your choice. I prefer the Elderbrock for street driving. Easier to tune and stays in tune longer. My $ .02. You may like how it runs. When you want a cam, call Crane's hot-line. Tell them what you have and what you want it to do and they will recommend proper cam. Most cam's that are installed are to big. Yeah, bigger isn't always better here. Ask for Tony at Crane, he knows what he's talking about. [This message has been edited by Gearhead999 (edited 07-17-2001).]

07-17-2001, 09:14 PM	#3
BennyBoy Guest Posts: n/a	I'm pretty sure on just about all engines that they put the same cam in original 2-bbl engines that they did in original 4-bbl engines. Is that right? ------------------ '69 Coupe with 351W ========================= Edelbrock RPM intake, Edelbrock RPM cam, Edelbrock 750 cfm carb, Edelbrock lifters, Edelbrock double roller timing chain, Edelbrock valve springs, Accel coil, Moroso Blue-Max wires, Hedman headers, 2 1/2" pipe, glasspacks, Flex fan, Lakewood traction bars, C4, 9" Currie on order, 290hp-stock heads ========================= The Surgeon General didn't say anything about smoking your azz!!

07-17-2001, 09:40 PM	#4
thunderbolt Registered Member Join Date: Oct 1998 Location: Houston, TX, USA Posts: 380	Ponydude: What induction system do you have on the engine now? By 87, all 302's should have been fuel injected. As for the carb, you won't have to worry about the cam mismatch. Otherwise the most popular swap in the history of cars wouldn't work without major modification. True, to get the most benefit out of a 4bbl, you need some more parts, but these include things like exhaust, ignition, and heads in addition to carb. You will be just fine switching to a 4bbl.