Juice worth the squeeze /Sniper 2300 v 4150

[deckside]

My previous rig I had a 360 and the 4150 mounted to an edelbrock performer intake with hyperspark distributor. will I be underwhelmed if I just bolt up the 2300 to a stock intake on a 360, (will use the hyperspark again.)?

[tgreese]

Technically, there should be no difference between a 2V and 4V throttle body with the same flow characteristics. Even the 454 came with a 2V throttle body, albeit a somewhat larger one than a 350. The primaries and secondaries of a 4V carburetor are meant to maintain high vacuum at all throttle positions, ensuring fuel control under all conditions. EFI regards the vacuum as a signal, not as a power source to move the fuel. As long as there is enough vacuum to measure, EFI will work.

A TBI throttle body still has a venturi narrowing, though less of one one than a carburetor. That said, Holley probably makes their 4V throttle body larger than the 2V throttle body, and fuel delivery at WOT should be larger for the former. Up to you - all being equal, EFI should make more power because there's no need to restrict the flow to maintain high vacuum. However, there are too many variables here to answer your question definitively.

[deckside]

Always very thoughtful response, than you tgreese. I guess it just breaks down to if I want extra hp from an aftermarket/ performer.intake.

[tgreese]

I would mention that, long ago, I put a 500CFM Holley 2300 on my '73 304 CJ-5, and the improvement in performance was immediate. Got much worse gas mileage, and the unmodified Holley was terrible on the trail. There were sidehill and up/downhill positions where it would not run, and it flooded in response to bouncing. I went back to the factory 2100.

That said, seems like room for improvement exists using the factory 2V manifold. I do not know at what point the larger venturis become less of a factor than the manifold restrictions; unless the increased displacement sucks up the difference, the higher CFM rating will matter. You might search for similar comments about the 2V 2300 upgrade of 360s here and at IFSJA.

Also - I looked at the Holley site, and could not find a venturi size for the 2300 Sniper. The 500CFM 2300 has a venturi of 1.376" diam. Holley claims the Sniper 2300 will support up to 650 hp with forced induction. No normally aspirated rating given though. The 650 rating gives you the fuel delivery, but I would expect it's limited before that by the air flow at atmospheric pressure. If you had the venturi size you could compare the the 350 and 454 Rochester throttle bodies and get a notion what to expect from the 2300 throttle body. The 2300 Sniper on a 4V aluminum aftermarket manifold with an adapter could be a "stage 2" upgrade, I'd think. The merit of a 2V TB on a 4V manifold has been discussed on the Jeep and IHC forums, I recall. I know that Bill Hamilton sells an adapter from the Rochester TB to a 4V intake - he might have some comment about this, but of course he'd want to sell you one of his systems not the Sniper.

[Srdayflyer]

i have that exact sniper system installed on my 83 cherokee, holly tech support is superb, my discussions with them prior to purchasing sniper/hyper spark.system they said up to 400 hp naturally asperated. the difference in performance is huge , tarts right up , and no running like crap until warmed up, check out my install article for ideas on my installation. i think you wil be completely satisfied after the installation

[Srdayflyer]

i also port matched the sniper to to the factory intake manifold and manifold to the head ports for smooth flow