12/24/2023 0 Comments Summit racing head porting kit![]() This chamber also furnishes the dual quench pattern of the older performance heads which is ued to concentrate the mixture into the valve pocket and in front of the spark plug which improves the initiation of the ignition event and speeds the burn which reduces the need for excessive spark advance and reduces the exposure to detonation causing events. The basic Vortec chamber provides a relief between the valve and the spark plug to guide the mixture into the chamber and start the remix of fuel to air process while engaging the beginning of the swirl action. A tight valve pocket, flying in the face of those who open the chamber up on the bore side is the SB2 and SB2.2 chamber which is extremely tight but also shallow and the engine uses extreme lift at the valve to overcome bore side flow issues which is something you can't easily overcome with a 23 degree head. This location also allows the plug to locate a little deeper toward the bore center. Key elements you're looking for in a chamber is pushing the spark plug as close to the bore center as the valves will permit with a wedge chamber, a bit of favoring the exhaust valve side does help with detonation/preignition control as well as keeping the plug from becoming fuel soaked by the intake blast and unmixed fuel streams that could flow over the tip. The small block Chrysler like so many used a very open chamber a configuration dictated by spark plug location which make it difficult to incorportate all of the Ricardo chamber features but the modern Magnum head comes very close and is very potent. The people who get the closest is GM, SBC-Gen I and II, and the Ford Windsor all of these started with a chamber that very similar but not so similar to the Ricardo that they violated his patents and evoked royality payments. Now it's in vouge and everybody is makeing a version that fits their basic original design and tooling. This layout is classic Ricardo and has been understood since the 1930's, just seldom used because it was patented and Sir Harry demanded a royality to use it, Ford did on the original Y blocks but discontinued it after the 1954 model year, then brought it back on the 1960 high performance 352 FE block for a year than dropped it again. The Vortec chamber and it's even better relatives to be found in the aluminum LT1 and LT4, and Fast Burn heads are very correct you see this again in the SB2 head combustion chamber layout. The visual differences between a highy efficient chamber and an almost efficient chamber are very subtle but the power resulting from doing the chamber right and doing it almost right is very significant. Everybody is caught up in flow numbers but that's half or less of the problem of getting power out of the cylinder. I would like to hear some thoughts on comparison of these flow numbers.Ĭlick to expand.What's missing in this is the combustion effeciency of the Vortec combustion chamber. I don't know how close flow numbers should be when comparing heads to put them in the same "performance" category but the intake flow numbers seem close but the exhaust is where the summit heads fall short. I'm not posting this to promote either head I am posting this because I was looking for flow numbers for the Summit vortecs and didn't find any information on them so I wanted to add this to our search results for future researchers. How may I help you?Ĭraig: i have been searching the web for flow numbers for you summit brand vortec heads and have had no luck finding anything just curious if summit had flow numbers available for part # SUM-151124Ĭraig: and this is for sure for the Summit Racing Vortec Cylinder head, correct?Ĭraig: do you know if these heads are setup to run a hydraulic roller camshaft?Ĭolton: The springs in these are for flat tappet cams.Ĭraig: okay, and these heads are only available assembled and not bare, correct?Ĭraig: okay, that's all I have for now. I finally talked to Summit about flow numbers for their house brand of the Vortecs and this is the conversation that we had via chat messagingĬolton: Hi, my name is Colton. I know the GM Vortecs have a very good reputation as do the RHS Pro Torker (no longer available). Ive been looking around at Vortec heads for the past few months (not constantly,lol).
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