what do you yhink of this top end kit for a SBC?
I will be rebuilding a tired 350 soon, and I found its a good chance to upgrade it a little bit, I'm hoping that I can get it to the 360-380 HP range using this top end kit from Summit (SME-K-375-400), what do you think of it and its components? is it worth the $1400 and will it bring my engine to the HP level I'm hoping to?
http://www.summitracing.com/parts/SME-K-375-400/ |
I would aim a little higher than 170 cc heads and sub .500 lift
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Those heads & cam on 350 will meet your stated goal ... however, I'd pick separately not a kit .... rarely do te kits match all specific needs. And, if you're building a 400 hp or less street 350, don't over-do it. Seat of the pants Torque is what most street cars need ... lotsa hp at hi-rpm isn't always so practical. It's usually pretty cheap & easy to rebuild as a 383 ... they make lotsa low-to-mid rpm Torque.
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I can't go for a 383 because of the budget and there are no good machines shop around here to balance the rotating assembly.
So lets say I will start with a nice 200 CFM head like the Summit SUM-162112 http://www.summitracing.com/parts/SUM-162112/ what kind of camshaft would recommend for them in terms of duration and lift? I built several BBCs before, but this is my first SBC build and I really don't know my way here! (hence my silly questions!) |
For that money you could get a nice set of Brodix heads that flow really good and you know exactly what you are getting. I'm by no means an engine expert -- I'm barely a novice, but 200CFM heads sound like overkill for a 350. I would think something in the 180-185 range would work better. I have 200 CFM heads on my car now, but plan to put a 383 bottom-end in it soon to take advantage of the increased flow.
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look into Edelbrock heads. they are 180cc. like said before, don't over do it. what's your budget?
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Originally Posted by qwank
(Post 1576961190)
look into Edelbrock heads. they are 180cc. like said before, don't over do it. what's your budget?
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Originally Posted by CA-Legal-Vette
(Post 1576961250)
:iagree: Edelbrock has complete kits too. Watch out for the intake. If you're planning on running the stock Q-jet carb, the intake in the Summit kit won't work. That's for a square bore carb like a Holley.
I'm sure there may even be better cams out there now |
My budget is $1500. I just saw a nice 180cc Brodix heads and they sell for $1100/pair (Summit BRO-1021004)
http://www.summitracing.com/parts/BRO-1021004/ I think that may be a good start for a nice 350 build. Now for the camshaft selection, I need something to be used with a stock converter and has smooth idle, will I be under-using my heads if I do so? |
HammadUP - I have been eyeing the same kit
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I just made a list of engine parts, if anyone wants to evaluate it :
1- Brodix cylinder heads, 180cc/64cc. 2- Lunati flat tappet cam, Duration at .50 219 int./227 exh. with .468 in./0.489 in. lift. 3- Edelbrock Performer Intake, I thought about the air-gap, but I fear that may affect the idle/low end. All that, plus timing sets, gaskets, ARP head bolts .. etc, will cost $1720, I'll exceed my budget, and hopefully it will be worth it. |
Originally Posted by HamadUP
(Post 1576962281)
I just made a list of engine parts, if anyone wants to evaluate it :
1- Brodix cylinder heads, 180cc/64cc. 2- Lunati flat tappet cam, Duration at .50 219 int./227 exh. with .468 in./0.489 in. lift. 3- Edelbrock Performer Intake, I thought about the air-gap, but I fear that may affect the idle/low end. All that, plus timing sets, gaskets, ARP head bolts .. etc, will cost $1720, I'll exceed my budget, and hopefully it will be worth it. timing chain pushrods gaskets Bolts etc. |
Originally Posted by 98MustGT
(Post 1576962662)
What about...
timing chain pushrods gaskets Bolts etc. i.ll keep pushrods to the last as I would like to check their size during the build 1st. |
Originally Posted by 98MustGT
(Post 1576962662)
What about...
timing chain pushrods gaskets Bolts etc. |
My first upgrade on my L48 was 200cc iron Sportsman II heads, 10:1 cr hyperutectic pistons with CompCams 270H hydraulic flat tappet cam, a Holley 750DP mechanical sec. and RPM Air Gap intake. You don't necessarily need aluminum heads.
With these few changes it took a car which could barely keep ahead of a 93 Cavalier to something that was mucho fun to drive on the street and blow the doors off the ricers that used to surround me at stop lights. I don't see them at all these days since the 406ci let alone the 427ci :lol: BTW it made more HP and Tq when I put a Victor Jr single plane and solid flat tappet cam in it. I'll keep posting but most of the the myths are still out there :thumbs: That's a chassis dyno RWHP chart notice the date, these days I get more Tq at idle :lol: http://img.photobucket.com/albums/v1...DynoAIrGap.jpg |
This is the one I chose for the top end of my L-48, very good torque #'s
http://www.summitracing.com/parts/CMB-08-0039/ Should work well with factory convertor. |
The summit kits are pretty hard to beat for value when you consider the cost when you buy it all individually. The heads have 2.02 / 1.6 Valves . Includes a decent dual plane intake and streetable cam. This package has everything you need to meet your HP goals and still have a very drivable car.
Furthermore, it's all pre-matched so it takes the guesswork out of picking different components to work together. |
Originally Posted by HamadUP
(Post 1576960888)
I can't go for a 383 because of the budget and there are no good machines shop around here to balance the rotating assembly.
So lets say I will start with a nice 200 CFM head like the Summit SUM-162112 http://www.summitracing.com/parts/SUM-162112/ what kind of camshaft would recommend for them in terms of duration and lift? I built several BBCs before, but this is my first SBC build and I really don't know my way here! (hence my silly questions!) If IF IF you have dished pistons aka OE L48 ... ... find a deal on 58cc chamber alum heads like OE GM L98 aka ZZ4 heads ... GM p/n 12556463 (cast # ends 113) ... good cam & lite porting will easily meet your stated goal (360-380hp). OR if you have flattops ... good cam & iron vortecs'll get you there too. what is it ... dished or flat? probably should've answered that along with budget to begin with. |
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