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4.3 CPI High Performance Build

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Old 11-07-2003, 11:02 PM   #1
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4.3 CPI High Performance Build

Thinking of doing a high performance build up on a 4.3L CPI. Bore possibly stroked, cam, heads, 150+ shot of nitrous, 6 spd. Any info would be great. Thanks

gkonrady@comcast.net
Old 11-08-2003, 12:21 AM   #2
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I just built up my CPI motor last year. on good days I can get into high 14's normaly aspirated. Ill give you a list of what I have done

1 bored .030
2 9.72-1 forged SB pistons with chrome moly rings
3 Stage I ported heads, only minor port work 2.02 intake, 1.60 exhaust valves
4 266HR comp cam .500 lift, 210 intake, 215 exhaust duration @ .050
5 stock pushrods
6 1.6 roller tip comp cam rockers
7 port/polished intake manifolds
8 JBA exhaust headers
9 MSD 6AL ignition w/ Blaster Coil
10 Stock wires and plugs
11 K&N FIPKII

If you want to get a stroker kit look at www.speedomotive.com they have a fully balanced kit for $1200. I am though trying to look into forced induction for the CPI motor. hope this helps out.
Old 11-08-2003, 12:24 AM   #3
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Mach Performance makes the BEST 4.3L stroker kit, but it costs the most too. Will a 4.3 hold up to a 150 shot of nitrous?
Old 11-09-2003, 07:00 AM   #4
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Machperformance don't have a stroker kit . I have an 4.3L which was machined at machperformance and all the parts from them and i put 225 shot on this motor with stock crank and made more then 400rwhp , so thats close to 500 hp at the motor .
c-ya
Old 11-09-2003, 10:36 AM   #5
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i thought for sure they did...but now i cant find the damn link. maybe it was a company with a similar name.
Old 11-09-2003, 11:42 AM   #6
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i was planning on doing a very similar build up on my CPI. only problem is that now, my tranny is in dire need of a rebuild now. So now, i have to focus on my tranny first. If u dont mind me asking, may I ask you RedGT, how much did all that cost ya?
Old 11-09-2003, 11:51 AM   #7
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I just had the tranny rebuilt in my wifes 95 jimmy. It cost me about 1500.00 bucks. But it is built stonger now with a shift kit. The guy said it would handle plenty of power. It shifts feakin awsome now. I can get a second gear scratch every time.
Old 11-09-2003, 06:06 PM   #8
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heh. awesome stuff dude. what type of build up did u do? did u do a stock build up with a shift kit or stronger parts?
Old 11-09-2003, 11:30 PM   #9
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how do you know if your motor is a CPI or a TBI? is it the model years? is 97 the deciding year?
Old 11-09-2003, 11:35 PM   #10
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no. CPI has a big intake, with the intake valve on the front of the manifold. the TBI stopped in 1995, as did the CPI. the TBI was a glirified carb, the CPI made more stock horses than any other engine, but also is harder to maintain, and the injection system isnt that great. 1996+ is an MPFI or SFI engine, which resembles the TBI engine, but is a lot different. the CPI engine also has the best project heads, and came with a VERY aggressive cam.
Old 11-13-2003, 11:10 PM   #11
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It cost me roughly 5 grand for the new engine. That includes the Tranny too though but that was only about 3-4 hundred.
Old 11-14-2003, 07:37 AM   #12
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how high performance do you want ? race proven motors builds alot of the sy'ty 4.3's and build some of the fastest if not the faster 4.3 motors in the world. but if your gunna stroke your motor be very careful on which crank you runIMO i would only get a billet crank but thats alot of $$.
Old 11-21-2003, 10:09 AM   #13
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before you go off and have a transmission rebuiilt for 1500 bucks, take a look at jegs hi performance trannys, like 600 bucks, do some reasearch to be sure but i'm pretty postitive they bolt right up to 4.3s(they do to 350s) and save yourself 800 bucks, and gain a performancxe tranny as opposed to a rebuilt stocker
Old 11-21-2003, 08:41 PM   #14
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wait, muddy, according to my RPO i have a CPI in my 01, also, excuse me for being dumb, but what does IMO mean?
Old 11-22-2003, 01:13 AM   #15
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ok, first off. IMO = in my opinion. And second of all, your truck is SFI. NOT CPI. Last year CPI was made was 1995. I CAN GUARANTEE IT!!! Ask anybody on this site. they will tell ya! LOL. im not trying to make u feel bad, but its the truth. Just trying to help a fellow s-series member out :-)
Old 11-22-2003, 11:31 PM   #16
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hmmm, so are the codes on the forum wrong then? the code in the glove box is
"L35" ENGINE , "GAS, 6 CYL, 4.3L, CPI, V6, 90 DEG, HO"
and thats what the forum translator gave to me
Old 11-23-2003, 12:40 AM   #17
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the L35 code is a cpi engine.
84
Old 11-23-2003, 11:40 AM   #18
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Don't think the forum's RPO translator is the end-all. They gave me this: LB4: _ ENGINE, "GAS, 4 CYL, 1.2L, MFI, DOHC, PORT" when it's obvious LB4 in a 87-95 S-series is a 4.3 TBI. GM reused RPOs over the years to mean different things. Unless you have an RPO check for your specific year, there's always a margin for error.

Last edited by Matt 4.3 TBI; 11-23-2003 at 11:41 AM.
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