1991firebirdman

hello,
i have an opportunity to buy a cross ram intake for my camaro, it seems to be a great deal but i dont know anything about the holley 660 carb. also is this carb when paired better or equal to a Dp 750. by the way my combo is a long rod 406 with l82 heads with 2.02 1.60 valves, its supposed to make 400-425 hp at the fly wheel. if anyone can help me it will be greatly appreciated. amd srry for the noobish question.

Damon

Cross-ram intake? If you're new to this hobby this is NOT the combo you want to learn on. That's a VERY special intake and the carburetion is considerably different than you would find on top of a more common center-mounted carb applications.

Experienced hotrodders shy away from these kind of combos. You really ready to tackle something of this magnitude? Would you be surprised to know that you can go just as fast or faster with a much easier to tune Vic Jr. single plane intake + an off-the-shelf carb?

I only say this becuase you're headed for a world of headaches for little or no more power that a much more straight-forward combo could deliver.

The cross ram was a purpose-built intake for road racing 40-some years ago. It isn't well suited to street duty or even drag race duty. And a more modern single plane intake (ported Vic Jr. or Super Vic, for instance) will basically lay waste to it everywhere in the RPM range except at the extreme top end.

five7kid

iTrader: (14)

How long are the rods?

Do you have flow bench data on these specific, the-ones-on-your-engine, heads?

Dyno sheet?

L82 heads - code for "boat anchors".

Quick calculations: Assuming this 406 can make 425 HP at 5500 RPMs (which should be a piece of cake - the L82 heads may restrict that, though), it'll need 646 CFM (with a single plane intake manifold). Putting two 660 CFM carbs, with 1:1 linkage, on this engine, is an exercise is overcarburation. A single 750 CFM double pumper Holley on a Performer RPM dual plane intake will out-run and out-drive that cross-flow system in any situation.

Understand we're not trying to put you down, just trying to inject a dose of reality to the situation. If you want to impress the car show crowd with looks and a spec sheet, that's one thing. If you want to drive or race this car, you need to do a complete re-think of the approach.

radical82

Wanna sell the cross ram and start over???? I might be interested!

1991firebirdman

srry i havent been able to reply, works been long and hard lol. ok the specs on my engine are the rods are 350 rods. i cant remember the exact length at the moment. the heads came off his sons race car.i dont know what class he raced but it was an iron headed class and he moved up to an aluminum alowing class, they flow like 200-220 at .45-.5 in lift. i dont have a dyno sheet yet, were just goin off of a simmilar build he did but im hoping to get one soon. as for the tuning issues im not new to carbs ive been messin with dirtbikes for years i do realize that a auto carb is a different animal but the basics still remain the same. i dont want to sound stubborn but it just looks BA and i think it would look awsome but if it wont run right ever ill ditch it. thanks for the reply's if anyone else has more info on the topic post up, im always up for new knowlage.

rayar

iTrader: (1)

It just depends on what you want, If you are building a showcar then I say Crossram all the way. If go and show then it would depend on if you wanted more show or more go. A Victor JR with a 750DP will outperform and be more drivable and reliable not to mention easier to tune then the crossram. As was said earlier all of the crossrams are getting 30-40+ years old and just don't have the same power potential as a more modern intake but they are cool as heck. As far as carbs. I allways thought the 660 center squirters are a tunnel ram carb, Made for intakes with long runners and big plenums. I personally think you will have problems getting the 660's running right. I guess it just depend on which crossram you have but even then I think a pair of 600 DP's would be a better choice.

five7kid

iTrader: (14)

A pair of 450's would still be over-carbureted.

1991firebirdman

last night i finally got back to my engine builder and asked him about it. he said that on the cool scale of 1-10 crossrams are like a 11, but for what were shooting for the Dp would be the better choice, i guess i still have my entire life to build that crossram monster lol. i'll just stick to the single 4bbls for the time being. thanks for your help everyone!