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350 buildup
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harmon4127
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Joined: 05 Mar 2012
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Location: New richmond WI
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PostPosted: Mon Mar 05, 2012 11:04 pm    Post subject: 350 buildup Reply with quote

Hi all i recently pulled the motor from my 84 monte to install some aluminum heads. anyways i put them on there 210cc intake runners, 2.02 valve. exhaust 70cc port 1.60 valve. 58cc chambers. the engine had a comp cam installed about 3 years ago it was .480 .480 lift. 110deg lsa 231 231 dur @0.50 . has a eledbrock performer intake and 750 holley street hp carb. brought it to the engine dyno and it made only 327hp @ 4700 and 397 tq @3800. not impressed i think the cam is not right for the setup so i called bullet cams and they ground me a cam Intake .507 lift and ex.530 239 247 dur and 107 lsa. they ground the cam with 4deg advance in it . also they recommend i installed 1.6 rockers in the intake so that gives me .541 lift in intake and 240 dur. its a 350 .040 over and compression is 10.4-1 with my pistions. im going back to the dyno this wed any ideas on how much this cam will help???
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clay
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1972 Chevrolet Nova

PostPosted: Tue Mar 06, 2012 12:05 pm    Post subject: Reply with quote

Short answer - I give it another 20 h.p. over your previous cam. A RPM Airgap would probalby help some over your Performer intake. It wouldn't be tremendous but it should be a help. I would have thought your previous combo would have had a little more in it. Did you degree that cam or just line the dots up? On the dyno did you find the best timing and jetting combo? Was the curve nice and smooth or did it show some signs of valve spring trouble up top? Just pondering some ideas. Welcome to Smokemup! Clay
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squeeezer
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Joined: 02 Mar 2007
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Location: new richmond WI
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1991 Chevrolet Camaro

PostPosted: Tue Mar 06, 2012 1:36 pm    Post subject: Reply with quote

That motor should make (a flat tappet limited) 390-410 hp with a rpm/rpm airgap type intake
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harmon4127
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Location: New richmond WI
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PostPosted: Tue Mar 06, 2012 1:46 pm    Post subject: Reply with quote

the previous cam was installed with the dots lined up not degreed. We did 10 dyno pulls timing didn't change much we stated from 34 up to 38 making minor changes only along with rejetting the carb. it had nice curve just seems like it quit flowing. The dyno guy figured that cam was not moving enough air for the larger heads. With the cast heads 487s and a 700R4 and 3.73 gears the car went 13.33 best time so I was thinking these heads didn't really change all that much. Not sure i don't normally do much with engines im a transmission guy.
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squeeezer
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1991 Chevrolet Camaro

PostPosted: Tue Mar 06, 2012 2:31 pm    Post subject: Reply with quote

holy shit neighbor Shocked
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squeeezer
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1991 Chevrolet Camaro

PostPosted: Tue Mar 06, 2012 2:35 pm    Post subject: Reply with quote

who is your dyno guy?????
something is real wrong here

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harmon4127
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PostPosted: Tue Mar 06, 2012 4:00 pm    Post subject: Reply with quote

gary in shafer mn
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squeeezer
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Location: new richmond WI
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1991 Chevrolet Camaro

PostPosted: Tue Mar 06, 2012 4:14 pm    Post subject: Reply with quote

yup thats the next guy i have to go to since bob in eagan hung the biz up
gary comes highly recomended by frank and aaron who do my machine work and porting

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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Tue Mar 06, 2012 4:59 pm    Post subject: Reply with quote

Is this on an engine dyno? or chassis dyno?
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squeeezer
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Joined: 02 Mar 2007
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Location: new richmond WI
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1991 Chevrolet Camaro

PostPosted: Tue Mar 06, 2012 5:23 pm    Post subject: Reply with quote

Engine
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harmon4127
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PostPosted: Tue Mar 06, 2012 5:27 pm    Post subject: Reply with quote

gary does an awsome job i know it's nothing he's doing wrong
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squeeezer
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1991 Chevrolet Camaro

PostPosted: Tue Mar 06, 2012 8:51 pm    Post subject: Reply with quote

What spring are you running
How bout preload
How can that motor be done @ 4700RPM
What head did you buy?
Carb ok? What was afr? Bsfc?temps@primaries?
Should have 1000more rpm

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Last edited by squeeezer on Wed Mar 07, 2012 2:37 pm; edited 1 time in total
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harmon4127
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PostPosted: Tue Mar 06, 2012 10:45 pm    Post subject: Reply with quote

im at home now my dyno sheets are at work but im going to the dyno tomorrow at 9 so i will update tomorrow
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af2
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1933 Willys Coupe

PostPosted: Tue Mar 06, 2012 11:18 pm    Post subject: Reply with quote

Unless the heads were milled, I have never seen a 58cc with 210cc intake?
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harmon4127
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PostPosted: Thu Mar 08, 2012 4:09 pm    Post subject: Reply with quote

well ended getting 381tq @ 4400 and 355hp @5400. Tried 3 different spacers, jetting, timing 110 and 92 made no difference. Even tried a different carb. Gary said the motor is only flowing alittle over 500CFM.
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